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| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 14 Jun 2012 20:43:12 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 \input texinfo @c -*-texinfo-*- |
| 2 | |
| 3 @c %**start of header | |
| 4 @setfilename libgomp.info | |
| 5 @settitle GNU libgomp | |
| 6 @c %**end of header | |
| 7 | |
| 8 | |
| 9 @copying | |
|
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10 Copyright @copyright{} 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc. |
| 0 | 11 |
| 12 Permission is granted to copy, distribute and/or modify this document | |
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13 under the terms of the GNU Free Documentation License, Version 1.3 or |
| 0 | 14 any later version published by the Free Software Foundation; with the |
| 15 Invariant Sections being ``Funding Free Software'', the Front-Cover | |
| 16 texts being (a) (see below), and with the Back-Cover Texts being (b) | |
| 17 (see below). A copy of the license is included in the section entitled | |
| 18 ``GNU Free Documentation License''. | |
| 19 | |
| 20 (a) The FSF's Front-Cover Text is: | |
| 21 | |
| 22 A GNU Manual | |
| 23 | |
| 24 (b) The FSF's Back-Cover Text is: | |
| 25 | |
| 26 You have freedom to copy and modify this GNU Manual, like GNU | |
| 27 software. Copies published by the Free Software Foundation raise | |
| 28 funds for GNU development. | |
| 29 @end copying | |
| 30 | |
| 31 @ifinfo | |
| 32 @dircategory GNU Libraries | |
| 33 @direntry | |
| 34 * libgomp: (libgomp). GNU OpenMP runtime library | |
| 35 @end direntry | |
| 36 | |
| 37 This manual documents the GNU implementation of the OpenMP API for | |
| 38 multi-platform shared-memory parallel programming in C/C++ and Fortran. | |
| 39 | |
| 40 Published by the Free Software Foundation | |
| 41 51 Franklin Street, Fifth Floor | |
| 42 Boston, MA 02110-1301 USA | |
| 43 | |
| 44 @insertcopying | |
| 45 @end ifinfo | |
| 46 | |
| 47 | |
| 48 @setchapternewpage odd | |
| 49 | |
| 50 @titlepage | |
| 51 @title The GNU OpenMP Implementation | |
| 52 @page | |
| 53 @vskip 0pt plus 1filll | |
| 54 @comment For the @value{version-GCC} Version* | |
| 55 @sp 1 | |
| 56 Published by the Free Software Foundation @* | |
| 57 51 Franklin Street, Fifth Floor@* | |
| 58 Boston, MA 02110-1301, USA@* | |
| 59 @sp 1 | |
| 60 @insertcopying | |
| 61 @end titlepage | |
| 62 | |
| 63 @summarycontents | |
| 64 @contents | |
| 65 @page | |
| 66 | |
| 67 | |
| 68 @node Top | |
| 69 @top Introduction | |
| 70 @cindex Introduction | |
| 71 | |
| 72 This manual documents the usage of libgomp, the GNU implementation of the | |
| 73 @uref{http://www.openmp.org, OpenMP} Application Programming Interface (API) | |
| 74 for multi-platform shared-memory parallel programming in C/C++ and Fortran. | |
| 75 | |
| 76 | |
| 77 | |
| 78 @comment | |
| 79 @comment When you add a new menu item, please keep the right hand | |
| 80 @comment aligned to the same column. Do not use tabs. This provides | |
| 81 @comment better formatting. | |
| 82 @comment | |
| 83 @menu | |
| 84 * Enabling OpenMP:: How to enable OpenMP for your applications. | |
| 85 * Runtime Library Routines:: The OpenMP runtime application programming | |
| 86 interface. | |
| 87 * Environment Variables:: Influencing runtime behavior with environment | |
| 88 variables. | |
| 89 * The libgomp ABI:: Notes on the external ABI presented by libgomp. | |
| 90 * Reporting Bugs:: How to report bugs in GNU OpenMP. | |
| 91 * Copying:: GNU general public license says | |
| 92 how you can copy and share libgomp. | |
| 93 * GNU Free Documentation License:: | |
| 94 How you can copy and share this manual. | |
| 95 * Funding:: How to help assure continued work for free | |
| 96 software. | |
| 97 * Index:: Index of this documentation. | |
| 98 @end menu | |
| 99 | |
| 100 | |
| 101 @c --------------------------------------------------------------------- | |
| 102 @c Enabling OpenMP | |
| 103 @c --------------------------------------------------------------------- | |
| 104 | |
| 105 @node Enabling OpenMP | |
| 106 @chapter Enabling OpenMP | |
| 107 | |
| 108 To activate the OpenMP extensions for C/C++ and Fortran, the compile-time | |
| 109 flag @command{-fopenmp} must be specified. This enables the OpenMP directive | |
| 110 @code{#pragma omp} in C/C++ and @code{!$omp} directives in free form, | |
| 111 @code{c$omp}, @code{*$omp} and @code{!$omp} directives in fixed form, | |
| 112 @code{!$} conditional compilation sentinels in free form and @code{c$}, | |
| 113 @code{*$} and @code{!$} sentinels in fixed form, for Fortran. The flag also | |
| 114 arranges for automatic linking of the OpenMP runtime library | |
| 115 (@ref{Runtime Library Routines}). | |
| 116 | |
| 117 A complete description of all OpenMP directives accepted may be found in | |
| 118 the @uref{http://www.openmp.org, OpenMP Application Program Interface} manual, | |
| 119 version 3.0. | |
| 120 | |
| 121 | |
| 122 @c --------------------------------------------------------------------- | |
| 123 @c Runtime Library Routines | |
| 124 @c --------------------------------------------------------------------- | |
| 125 | |
| 126 @node Runtime Library Routines | |
| 127 @chapter Runtime Library Routines | |
| 128 | |
| 129 The runtime routines described here are defined by section 3 of the OpenMP | |
| 130 specifications in version 3.0. The routines are structured in following | |
| 131 three parts: | |
| 132 | |
| 133 Control threads, processors and the parallel environment. | |
| 134 | |
| 135 @menu | |
| 136 * omp_get_active_level:: Number of active parallel regions | |
| 137 * omp_get_ancestor_thread_num:: Ancestor thread ID | |
| 138 * omp_get_dynamic:: Dynamic teams setting | |
| 139 * omp_get_level:: Number of parallel regions | |
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140 * omp_get_max_active_levels:: Maximum number of active regions |
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141 * omp_get_max_threads:: Maximum number of threads of parallel region |
| 0 | 142 * omp_get_nested:: Nested parallel regions |
| 143 * omp_get_num_procs:: Number of processors online | |
| 144 * omp_get_num_threads:: Size of the active team | |
| 145 * omp_get_schedule:: Obtain the runtime scheduling method | |
| 146 * omp_get_team_size:: Number of threads in a team | |
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147 * omp_get_thread_limit:: Maximum number of threads |
| 0 | 148 * omp_get_thread_num:: Current thread ID |
| 149 * omp_in_parallel:: Whether a parallel region is active | |
| 150 * omp_set_dynamic:: Enable/disable dynamic teams | |
| 151 * omp_set_max_active_levels:: Limits the number of active parallel regions | |
| 152 * omp_set_nested:: Enable/disable nested parallel regions | |
| 153 * omp_set_num_threads:: Set upper team size limit | |
| 154 * omp_set_schedule:: Set the runtime scheduling method | |
| 155 @end menu | |
| 156 | |
| 157 Initialize, set, test, unset and destroy simple and nested locks. | |
| 158 | |
| 159 @menu | |
| 160 * omp_init_lock:: Initialize simple lock | |
| 161 * omp_set_lock:: Wait for and set simple lock | |
| 162 * omp_test_lock:: Test and set simple lock if available | |
| 163 * omp_unset_lock:: Unset simple lock | |
| 164 * omp_destroy_lock:: Destroy simple lock | |
| 165 * omp_init_nest_lock:: Initialize nested lock | |
| 166 * omp_set_nest_lock:: Wait for and set simple lock | |
| 167 * omp_test_nest_lock:: Test and set nested lock if available | |
| 168 * omp_unset_nest_lock:: Unset nested lock | |
| 169 * omp_destroy_nest_lock:: Destroy nested lock | |
| 170 @end menu | |
| 171 | |
| 172 Portable, thread-based, wall clock timer. | |
| 173 | |
| 174 @menu | |
| 175 * omp_get_wtick:: Get timer precision. | |
| 176 * omp_get_wtime:: Elapsed wall clock time. | |
| 177 @end menu | |
| 178 | |
| 179 | |
| 180 | |
| 181 @node omp_get_active_level | |
| 182 @section @code{omp_get_active_level} -- Number of parallel regions | |
| 183 @table @asis | |
| 184 @item @emph{Description}: | |
| 185 This function returns the nesting level for the active parallel blocks, | |
| 186 which enclose the calling call. | |
| 187 | |
| 188 @item @emph{C/C++} | |
| 189 @multitable @columnfractions .20 .80 | |
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190 @item @emph{Prototype}: @tab @code{int omp_get_active_level(void);} |
| 0 | 191 @end multitable |
| 192 | |
| 193 @item @emph{Fortran}: | |
| 194 @multitable @columnfractions .20 .80 | |
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195 @item @emph{Interface}: @tab @code{integer function omp_get_active_level()} |
| 0 | 196 @end multitable |
| 197 | |
| 198 @item @emph{See also}: | |
| 199 @ref{omp_get_level}, @ref{omp_get_max_active_levels}, @ref{omp_set_max_active_levels} | |
| 200 | |
| 201 @item @emph{Reference}: | |
| 202 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.19. | |
| 203 @end table | |
| 204 | |
| 205 | |
| 206 | |
| 207 @node omp_get_ancestor_thread_num | |
| 208 @section @code{omp_get_ancestor_thread_num} -- Ancestor thread ID | |
| 209 @table @asis | |
| 210 @item @emph{Description}: | |
| 211 This function returns the thread identification number for the given | |
| 212 nesting level of the current thread. For values of @var{level} outside | |
| 213 zero to @code{omp_get_level} -1 is returned; if @var{level} is | |
| 214 @code{omp_get_level} the result is identical to @code{omp_get_thread_num}. | |
| 215 | |
| 216 @item @emph{C/C++} | |
| 217 @multitable @columnfractions .20 .80 | |
| 218 @item @emph{Prototype}: @tab @code{int omp_get_ancestor_thread_num(int level);} | |
| 219 @end multitable | |
| 220 | |
| 221 @item @emph{Fortran}: | |
| 222 @multitable @columnfractions .20 .80 | |
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223 @item @emph{Interface}: @tab @code{integer function omp_get_ancestor_thread_num(level)} |
| 0 | 224 @item @tab @code{integer level} |
| 225 @end multitable | |
| 226 | |
| 227 @item @emph{See also}: | |
| 228 @ref{omp_get_level}, @ref{omp_get_thread_num}, @ref{omp_get_team_size} | |
| 229 | |
| 230 @item @emph{Reference}: | |
| 231 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.17. | |
| 232 @end table | |
| 233 | |
| 234 | |
| 235 | |
| 236 @node omp_get_dynamic | |
| 237 @section @code{omp_get_dynamic} -- Dynamic teams setting | |
| 238 @table @asis | |
| 239 @item @emph{Description}: | |
| 240 This function returns @code{true} if enabled, @code{false} otherwise. | |
| 241 Here, @code{true} and @code{false} represent their language-specific | |
| 242 counterparts. | |
| 243 | |
| 244 The dynamic team setting may be initialized at startup by the | |
| 245 @code{OMP_DYNAMIC} environment variable or at runtime using | |
| 246 @code{omp_set_dynamic}. If undefined, dynamic adjustment is | |
| 247 disabled by default. | |
| 248 | |
| 249 @item @emph{C/C++}: | |
| 250 @multitable @columnfractions .20 .80 | |
|
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251 @item @emph{Prototype}: @tab @code{int omp_get_dynamic(void);} |
| 0 | 252 @end multitable |
| 253 | |
| 254 @item @emph{Fortran}: | |
| 255 @multitable @columnfractions .20 .80 | |
| 256 @item @emph{Interface}: @tab @code{logical function omp_get_dynamic()} | |
| 257 @end multitable | |
| 258 | |
| 259 @item @emph{See also}: | |
| 260 @ref{omp_set_dynamic}, @ref{OMP_DYNAMIC} | |
| 261 | |
| 262 @item @emph{Reference}: | |
| 263 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.8. | |
| 264 @end table | |
| 265 | |
| 266 | |
| 267 | |
| 268 @node omp_get_level | |
| 269 @section @code{omp_get_level} -- Obtain the current nesting level | |
| 270 @table @asis | |
| 271 @item @emph{Description}: | |
| 272 This function returns the nesting level for the parallel blocks, | |
| 273 which enclose the calling call. | |
| 274 | |
| 275 @item @emph{C/C++} | |
| 276 @multitable @columnfractions .20 .80 | |
|
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277 @item @emph{Prototype}: @tab @code{int omp_get_level(void);} |
| 0 | 278 @end multitable |
| 279 | |
| 280 @item @emph{Fortran}: | |
| 281 @multitable @columnfractions .20 .80 | |
|
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282 @item @emph{Interface}: @tab @code{integer function omp_level()} |
| 0 | 283 @end multitable |
| 284 | |
| 285 @item @emph{See also}: | |
| 286 @ref{omp_get_active_level} | |
| 287 | |
| 288 @item @emph{Reference}: | |
| 289 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.16. | |
| 290 @end table | |
| 291 | |
| 292 | |
| 293 | |
| 294 @node omp_get_max_active_levels | |
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295 @section @code{omp_get_max_active_levels} -- Maximum number of active regions |
| 0 | 296 @table @asis |
| 297 @item @emph{Description}: | |
|
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298 This function obtains the maximum allowed number of nested, active parallel regions. |
| 0 | 299 |
| 300 @item @emph{C/C++} | |
| 301 @multitable @columnfractions .20 .80 | |
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302 @item @emph{Prototype}: @tab @code{int omp_get_max_active_levels(void);} |
| 0 | 303 @end multitable |
| 304 | |
| 305 @item @emph{Fortran}: | |
| 306 @multitable @columnfractions .20 .80 | |
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307 @item @emph{Interface}: @tab @code{integer function omp_get_max_active_levels()} |
| 0 | 308 @end multitable |
| 309 | |
| 310 @item @emph{See also}: | |
| 311 @ref{omp_set_max_active_levels}, @ref{omp_get_active_level} | |
| 312 | |
| 313 @item @emph{Reference}: | |
| 314 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.14. | |
| 315 @end table | |
| 316 | |
| 317 | |
| 318 | |
| 319 @node omp_get_max_threads | |
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320 @section @code{omp_get_max_threads} -- Maximum number of threads of parallel region |
| 0 | 321 @table @asis |
| 322 @item @emph{Description}: | |
|
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323 Return the maximum number of threads used for the current parallel region |
| 0 | 324 that does not use the clause @code{num_threads}. |
| 325 | |
| 326 @item @emph{C/C++}: | |
| 327 @multitable @columnfractions .20 .80 | |
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328 @item @emph{Prototype}: @tab @code{int omp_get_max_threads(void);} |
| 0 | 329 @end multitable |
| 330 | |
| 331 @item @emph{Fortran}: | |
| 332 @multitable @columnfractions .20 .80 | |
| 333 @item @emph{Interface}: @tab @code{integer function omp_get_max_threads()} | |
| 334 @end multitable | |
| 335 | |
| 336 @item @emph{See also}: | |
| 337 @ref{omp_set_num_threads}, @ref{omp_set_dynamic}, @ref{omp_get_thread_limit} | |
| 338 | |
| 339 @item @emph{Reference}: | |
| 340 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.3. | |
| 341 @end table | |
| 342 | |
| 343 | |
| 344 | |
| 345 @node omp_get_nested | |
| 346 @section @code{omp_get_nested} -- Nested parallel regions | |
| 347 @table @asis | |
| 348 @item @emph{Description}: | |
| 349 This function returns @code{true} if nested parallel regions are | |
| 350 enabled, @code{false} otherwise. Here, @code{true} and @code{false} | |
| 351 represent their language-specific counterparts. | |
| 352 | |
| 353 Nested parallel regions may be initialized at startup by the | |
| 354 @code{OMP_NESTED} environment variable or at runtime using | |
| 355 @code{omp_set_nested}. If undefined, nested parallel regions are | |
| 356 disabled by default. | |
| 357 | |
| 358 @item @emph{C/C++}: | |
| 359 @multitable @columnfractions .20 .80 | |
|
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360 @item @emph{Prototype}: @tab @code{int omp_get_nested(void);} |
| 0 | 361 @end multitable |
| 362 | |
| 363 @item @emph{Fortran}: | |
| 364 @multitable @columnfractions .20 .80 | |
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365 @item @emph{Interface}: @tab @code{logical function omp_get_nested()} |
| 0 | 366 @end multitable |
| 367 | |
| 368 @item @emph{See also}: | |
| 369 @ref{omp_set_nested}, @ref{OMP_NESTED} | |
| 370 | |
| 371 @item @emph{Reference}: | |
| 372 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.10. | |
| 373 @end table | |
| 374 | |
| 375 | |
| 376 | |
| 377 @node omp_get_num_procs | |
| 378 @section @code{omp_get_num_procs} -- Number of processors online | |
| 379 @table @asis | |
| 380 @item @emph{Description}: | |
| 381 Returns the number of processors online. | |
| 382 | |
| 383 @item @emph{C/C++}: | |
| 384 @multitable @columnfractions .20 .80 | |
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385 @item @emph{Prototype}: @tab @code{int omp_get_num_procs(void);} |
| 0 | 386 @end multitable |
| 387 | |
| 388 @item @emph{Fortran}: | |
| 389 @multitable @columnfractions .20 .80 | |
| 390 @item @emph{Interface}: @tab @code{integer function omp_get_num_procs()} | |
| 391 @end multitable | |
| 392 | |
| 393 @item @emph{Reference}: | |
| 394 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.5. | |
| 395 @end table | |
| 396 | |
| 397 | |
| 398 | |
| 399 @node omp_get_num_threads | |
| 400 @section @code{omp_get_num_threads} -- Size of the active team | |
| 401 @table @asis | |
| 402 @item @emph{Description}: | |
|
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403 Returns the number of threads in the current team. In a sequential section of |
| 0 | 404 the program @code{omp_get_num_threads} returns 1. |
| 405 | |
| 406 The default team size may be initialized at startup by the | |
| 407 @code{OMP_NUM_THREADS} environment variable. At runtime, the size | |
| 408 of the current team may be set either by the @code{NUM_THREADS} | |
| 409 clause or by @code{omp_set_num_threads}. If none of the above were | |
| 410 used to define a specific value and @code{OMP_DYNAMIC} is disabled, | |
| 411 one thread per CPU online is used. | |
| 412 | |
| 413 @item @emph{C/C++}: | |
| 414 @multitable @columnfractions .20 .80 | |
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415 @item @emph{Prototype}: @tab @code{int omp_get_num_threads(void);} |
| 0 | 416 @end multitable |
| 417 | |
| 418 @item @emph{Fortran}: | |
| 419 @multitable @columnfractions .20 .80 | |
| 420 @item @emph{Interface}: @tab @code{integer function omp_get_num_threads()} | |
| 421 @end multitable | |
| 422 | |
| 423 @item @emph{See also}: | |
| 424 @ref{omp_get_max_threads}, @ref{omp_set_num_threads}, @ref{OMP_NUM_THREADS} | |
| 425 | |
| 426 @item @emph{Reference}: | |
| 427 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.2. | |
| 428 @end table | |
| 429 | |
| 430 | |
| 431 | |
| 432 @node omp_get_schedule | |
| 433 @section @code{omp_get_schedule} -- Obtain the runtime scheduling method | |
| 434 @table @asis | |
| 435 @item @emph{Description}: | |
|
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436 Obtain the runtime scheduling method. The @var{kind} argument will be |
| 0 | 437 set to the value @code{omp_sched_static}, @code{omp_sched_dynamic}, |
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438 @code{omp_sched_guided} or @code{omp_sched_auto}. The second argument, |
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439 @var{modifier}, is set to the chunk size. |
| 0 | 440 |
| 441 @item @emph{C/C++} | |
| 442 @multitable @columnfractions .20 .80 | |
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443 @item @emph{Prototype}: @tab @code{omp_schedule(omp_sched_t *kind, int *modifier);} |
| 0 | 444 @end multitable |
| 445 | |
| 446 @item @emph{Fortran}: | |
| 447 @multitable @columnfractions .20 .80 | |
| 448 @item @emph{Interface}: @tab @code{subroutine omp_schedule(kind, modifier)} | |
| 449 @item @tab @code{integer(kind=omp_sched_kind) kind} | |
| 450 @item @tab @code{integer modifier} | |
| 451 @end multitable | |
| 452 | |
| 453 @item @emph{See also}: | |
| 454 @ref{omp_set_schedule}, @ref{OMP_SCHEDULE} | |
| 455 | |
| 456 @item @emph{Reference}: | |
| 457 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.12. | |
| 458 @end table | |
| 459 | |
| 460 | |
| 461 | |
| 462 @node omp_get_team_size | |
| 463 @section @code{omp_get_team_size} -- Number of threads in a team | |
| 464 @table @asis | |
| 465 @item @emph{Description}: | |
| 466 This function returns the number of threads in a thread team to which | |
| 467 either the current thread or its ancestor belongs. For values of @var{level} | |
|
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468 outside zero to @code{omp_get_level}, -1 is returned; if @var{level} is zero, |
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469 1 is returned, and for @code{omp_get_level}, the result is identical |
| 0 | 470 to @code{omp_get_num_threads}. |
| 471 | |
| 472 @item @emph{C/C++}: | |
| 473 @multitable @columnfractions .20 .80 | |
|
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474 @item @emph{Prototype}: @tab @code{int omp_get_team_size(int level);} |
| 0 | 475 @end multitable |
| 476 | |
| 477 @item @emph{Fortran}: | |
| 478 @multitable @columnfractions .20 .80 | |
| 479 @item @emph{Interface}: @tab @code{integer function omp_get_team_size(level)} | |
| 480 @item @tab @code{integer level} | |
| 481 @end multitable | |
| 482 | |
| 483 @item @emph{See also}: | |
| 484 @ref{omp_get_num_threads}, @ref{omp_get_level}, @ref{omp_get_ancestor_thread_num} | |
| 485 | |
| 486 @item @emph{Reference}: | |
| 487 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.18. | |
| 488 @end table | |
| 489 | |
| 490 | |
| 491 | |
| 492 @node omp_get_thread_limit | |
|
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493 @section @code{omp_get_thread_limit} -- Maximum number of threads |
| 0 | 494 @table @asis |
| 495 @item @emph{Description}: | |
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496 Return the maximum number of threads of the program. |
| 0 | 497 |
| 498 @item @emph{C/C++}: | |
| 499 @multitable @columnfractions .20 .80 | |
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500 @item @emph{Prototype}: @tab @code{int omp_get_thread_limit(void);} |
| 0 | 501 @end multitable |
| 502 | |
| 503 @item @emph{Fortran}: | |
| 504 @multitable @columnfractions .20 .80 | |
| 505 @item @emph{Interface}: @tab @code{integer function omp_get_thread_limit()} | |
| 506 @end multitable | |
| 507 | |
| 508 @item @emph{See also}: | |
| 509 @ref{omp_get_max_threads}, @ref{OMP_THREAD_LIMIT} | |
| 510 | |
| 511 @item @emph{Reference}: | |
| 512 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.13. | |
| 513 @end table | |
| 514 | |
| 515 | |
| 516 | |
| 517 @node omp_get_thread_num | |
| 518 @section @code{omp_get_thread_num} -- Current thread ID | |
| 519 @table @asis | |
| 520 @item @emph{Description}: | |
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521 Returns a unique thread identification number within the current team. |
| 0 | 522 In a sequential parts of the program, @code{omp_get_thread_num} |
| 523 always returns 0. In parallel regions the return value varies | |
| 524 from 0 to @code{omp_get_num_threads}-1 inclusive. The return | |
| 525 value of the master thread of a team is always 0. | |
| 526 | |
| 527 @item @emph{C/C++}: | |
| 528 @multitable @columnfractions .20 .80 | |
|
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529 @item @emph{Prototype}: @tab @code{int omp_get_thread_num(void);} |
| 0 | 530 @end multitable |
| 531 | |
| 532 @item @emph{Fortran}: | |
| 533 @multitable @columnfractions .20 .80 | |
| 534 @item @emph{Interface}: @tab @code{integer function omp_get_thread_num()} | |
| 535 @end multitable | |
| 536 | |
| 537 @item @emph{See also}: | |
| 538 @ref{omp_get_num_threads}, @ref{omp_get_ancestor_thread_num} | |
| 539 | |
| 540 @item @emph{Reference}: | |
| 541 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.4. | |
| 542 @end table | |
| 543 | |
| 544 | |
| 545 | |
| 546 @node omp_in_parallel | |
| 547 @section @code{omp_in_parallel} -- Whether a parallel region is active | |
| 548 @table @asis | |
| 549 @item @emph{Description}: | |
| 550 This function returns @code{true} if currently running in parallel, | |
| 551 @code{false} otherwise. Here, @code{true} and @code{false} represent | |
| 552 their language-specific counterparts. | |
| 553 | |
| 554 @item @emph{C/C++}: | |
| 555 @multitable @columnfractions .20 .80 | |
|
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556 @item @emph{Prototype}: @tab @code{int omp_in_parallel(void);} |
| 0 | 557 @end multitable |
| 558 | |
| 559 @item @emph{Fortran}: | |
| 560 @multitable @columnfractions .20 .80 | |
| 561 @item @emph{Interface}: @tab @code{logical function omp_in_parallel()} | |
| 562 @end multitable | |
| 563 | |
| 564 @item @emph{Reference}: | |
| 565 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.6. | |
| 566 @end table | |
| 567 | |
| 568 | |
| 569 @node omp_set_dynamic | |
| 570 @section @code{omp_set_dynamic} -- Enable/disable dynamic teams | |
| 571 @table @asis | |
| 572 @item @emph{Description}: | |
| 573 Enable or disable the dynamic adjustment of the number of threads | |
| 574 within a team. The function takes the language-specific equivalent | |
| 575 of @code{true} and @code{false}, where @code{true} enables dynamic | |
| 576 adjustment of team sizes and @code{false} disables it. | |
| 577 | |
| 578 @item @emph{C/C++}: | |
| 579 @multitable @columnfractions .20 .80 | |
|
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580 @item @emph{Prototype}: @tab @code{void omp_set_dynamic(int set);} |
| 0 | 581 @end multitable |
| 582 | |
| 583 @item @emph{Fortran}: | |
| 584 @multitable @columnfractions .20 .80 | |
| 585 @item @emph{Interface}: @tab @code{subroutine omp_set_dynamic(set)} | |
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586 @item @tab @code{logical, intent(in) :: set} |
| 0 | 587 @end multitable |
| 588 | |
| 589 @item @emph{See also}: | |
| 590 @ref{OMP_DYNAMIC}, @ref{omp_get_dynamic} | |
| 591 | |
| 592 @item @emph{Reference}: | |
| 593 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.7. | |
| 594 @end table | |
| 595 | |
| 596 | |
| 597 | |
| 598 @node omp_set_max_active_levels | |
| 599 @section @code{omp_set_max_active_levels} -- Limits the number of active parallel regions | |
| 600 @table @asis | |
| 601 @item @emph{Description}: | |
|
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602 This function limits the maximum allowed number of nested, active |
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603 parallel regions. |
| 0 | 604 |
| 605 @item @emph{C/C++} | |
| 606 @multitable @columnfractions .20 .80 | |
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607 @item @emph{Prototype}: @tab @code{void omp_set_max_active_levels(int max_levels);} |
| 0 | 608 @end multitable |
| 609 | |
| 610 @item @emph{Fortran}: | |
| 611 @multitable @columnfractions .20 .80 | |
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612 @item @emph{Interface}: @tab @code{subroutine omp_set_max_active_levels(max_levels)} |
| 0 | 613 @item @tab @code{integer max_levels} |
| 614 @end multitable | |
| 615 | |
| 616 @item @emph{See also}: | |
| 617 @ref{omp_get_max_active_levels}, @ref{omp_get_active_level} | |
| 618 | |
| 619 @item @emph{Reference}: | |
| 620 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.14. | |
| 621 @end table | |
| 622 | |
| 623 | |
| 624 | |
| 625 @node omp_set_nested | |
| 626 @section @code{omp_set_nested} -- Enable/disable nested parallel regions | |
| 627 @table @asis | |
| 628 @item @emph{Description}: | |
| 629 Enable or disable nested parallel regions, i.e., whether team members | |
| 630 are allowed to create new teams. The function takes the language-specific | |
| 631 equivalent of @code{true} and @code{false}, where @code{true} enables | |
| 632 dynamic adjustment of team sizes and @code{false} disables it. | |
| 633 | |
| 634 @item @emph{C/C++}: | |
| 635 @multitable @columnfractions .20 .80 | |
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636 @item @emph{Prototype}: @tab @code{void omp_set_nested(int set);} |
| 0 | 637 @end multitable |
| 638 | |
| 639 @item @emph{Fortran}: | |
| 640 @multitable @columnfractions .20 .80 | |
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641 @item @emph{Interface}: @tab @code{subroutine omp_set_nested(set)} |
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642 @item @tab @code{logical, intent(in) :: set} |
| 0 | 643 @end multitable |
| 644 | |
| 645 @item @emph{See also}: | |
| 646 @ref{OMP_NESTED}, @ref{omp_get_nested} | |
| 647 | |
| 648 @item @emph{Reference}: | |
| 649 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.9. | |
| 650 @end table | |
| 651 | |
| 652 | |
| 653 | |
| 654 @node omp_set_num_threads | |
| 655 @section @code{omp_set_num_threads} -- Set upper team size limit | |
| 656 @table @asis | |
| 657 @item @emph{Description}: | |
| 658 Specifies the number of threads used by default in subsequent parallel | |
| 659 sections, if those do not specify a @code{num_threads} clause. The | |
| 660 argument of @code{omp_set_num_threads} shall be a positive integer. | |
| 661 | |
| 662 @item @emph{C/C++}: | |
| 663 @multitable @columnfractions .20 .80 | |
|
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664 @item @emph{Prototype}: @tab @code{void omp_set_num_threads(int n);} |
| 0 | 665 @end multitable |
| 666 | |
| 667 @item @emph{Fortran}: | |
| 668 @multitable @columnfractions .20 .80 | |
|
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669 @item @emph{Interface}: @tab @code{subroutine omp_set_num_threads(n)} |
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670 @item @tab @code{integer, intent(in) :: n} |
| 0 | 671 @end multitable |
| 672 | |
| 673 @item @emph{See also}: | |
| 674 @ref{OMP_NUM_THREADS}, @ref{omp_get_num_threads}, @ref{omp_get_max_threads} | |
| 675 | |
| 676 @item @emph{Reference}: | |
| 677 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.1. | |
| 678 @end table | |
| 679 | |
| 680 | |
| 681 | |
| 682 @node omp_set_schedule | |
| 683 @section @code{omp_set_schedule} -- Set the runtime scheduling method | |
| 684 @table @asis | |
| 685 @item @emph{Description}: | |
| 686 Sets the runtime scheduling method. The @var{kind} argument can have the | |
| 687 value @code{omp_sched_static}, @code{omp_sched_dynamic}, | |
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688 @code{omp_sched_guided} or @code{omp_sched_auto}. Except for |
| 0 | 689 @code{omp_sched_auto}, the chunk size is set to the value of |
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690 @var{modifier} if positive, or to the default value if zero or negative. |
| 0 | 691 For @code{omp_sched_auto} the @var{modifier} argument is ignored. |
| 692 | |
| 693 @item @emph{C/C++} | |
| 694 @multitable @columnfractions .20 .80 | |
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695 @item @emph{Prototype}: @tab @code{int omp_set_schedule(omp_sched_t *kind, int *modifier);} |
| 0 | 696 @end multitable |
| 697 | |
| 698 @item @emph{Fortran}: | |
| 699 @multitable @columnfractions .20 .80 | |
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700 @item @emph{Interface}: @tab @code{subroutine omp_set_schedule(kind, modifier)} |
| 0 | 701 @item @tab @code{integer(kind=omp_sched_kind) kind} |
| 702 @item @tab @code{integer modifier} | |
| 703 @end multitable | |
| 704 | |
| 705 @item @emph{See also}: | |
| 706 @ref{omp_get_schedule} | |
| 707 @ref{OMP_SCHEDULE} | |
| 708 | |
| 709 @item @emph{Reference}: | |
| 710 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.2.11. | |
| 711 @end table | |
| 712 | |
| 713 | |
| 714 | |
| 715 @node omp_init_lock | |
| 716 @section @code{omp_init_lock} -- Initialize simple lock | |
| 717 @table @asis | |
| 718 @item @emph{Description}: | |
|
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719 Initialize a simple lock. After initialization, the lock is in |
| 0 | 720 an unlocked state. |
| 721 | |
| 722 @item @emph{C/C++}: | |
| 723 @multitable @columnfractions .20 .80 | |
| 724 @item @emph{Prototype}: @tab @code{void omp_init_lock(omp_lock_t *lock);} | |
| 725 @end multitable | |
| 726 | |
| 727 @item @emph{Fortran}: | |
| 728 @multitable @columnfractions .20 .80 | |
| 729 @item @emph{Interface}: @tab @code{subroutine omp_init_lock(lock)} | |
| 730 @item @tab @code{integer(omp_lock_kind), intent(out) :: lock} | |
| 731 @end multitable | |
| 732 | |
| 733 @item @emph{See also}: | |
| 734 @ref{omp_destroy_lock} | |
| 735 | |
| 736 @item @emph{Reference}: | |
| 737 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.1. | |
| 738 @end table | |
| 739 | |
| 740 | |
| 741 | |
| 742 @node omp_set_lock | |
| 743 @section @code{omp_set_lock} -- Wait for and set simple lock | |
| 744 @table @asis | |
| 745 @item @emph{Description}: | |
| 746 Before setting a simple lock, the lock variable must be initialized by | |
| 747 @code{omp_init_lock}. The calling thread is blocked until the lock | |
| 748 is available. If the lock is already held by the current thread, | |
| 749 a deadlock occurs. | |
| 750 | |
| 751 @item @emph{C/C++}: | |
| 752 @multitable @columnfractions .20 .80 | |
| 753 @item @emph{Prototype}: @tab @code{void omp_set_lock(omp_lock_t *lock);} | |
| 754 @end multitable | |
| 755 | |
| 756 @item @emph{Fortran}: | |
| 757 @multitable @columnfractions .20 .80 | |
| 758 @item @emph{Interface}: @tab @code{subroutine omp_set_lock(lock)} | |
|
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759 @item @tab @code{integer(omp_lock_kind), intent(inout) :: lock} |
| 0 | 760 @end multitable |
| 761 | |
| 762 @item @emph{See also}: | |
| 763 @ref{omp_init_lock}, @ref{omp_test_lock}, @ref{omp_unset_lock} | |
| 764 | |
| 765 @item @emph{Reference}: | |
| 766 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.3. | |
| 767 @end table | |
| 768 | |
| 769 | |
| 770 | |
| 771 @node omp_test_lock | |
| 772 @section @code{omp_test_lock} -- Test and set simple lock if available | |
| 773 @table @asis | |
| 774 @item @emph{Description}: | |
| 775 Before setting a simple lock, the lock variable must be initialized by | |
| 776 @code{omp_init_lock}. Contrary to @code{omp_set_lock}, @code{omp_test_lock} | |
| 777 does not block if the lock is not available. This function returns | |
| 778 @code{true} upon success, @code{false} otherwise. Here, @code{true} and | |
| 779 @code{false} represent their language-specific counterparts. | |
| 780 | |
| 781 @item @emph{C/C++}: | |
| 782 @multitable @columnfractions .20 .80 | |
| 783 @item @emph{Prototype}: @tab @code{int omp_test_lock(omp_lock_t *lock);} | |
| 784 @end multitable | |
| 785 | |
| 786 @item @emph{Fortran}: | |
| 787 @multitable @columnfractions .20 .80 | |
| 788 @item @emph{Interface}: @tab @code{subroutine omp_test_lock(lock)} | |
| 789 @item @tab @code{logical(omp_logical_kind) :: omp_test_lock} | |
|
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790 @item @tab @code{integer(omp_lock_kind), intent(inout) :: lock} |
| 0 | 791 @end multitable |
| 792 | |
| 793 @item @emph{See also}: | |
| 794 @ref{omp_init_lock}, @ref{omp_set_lock}, @ref{omp_set_lock} | |
| 795 | |
| 796 @item @emph{Reference}: | |
| 797 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.5. | |
| 798 @end table | |
| 799 | |
| 800 | |
| 801 | |
| 802 @node omp_unset_lock | |
| 803 @section @code{omp_unset_lock} -- Unset simple lock | |
| 804 @table @asis | |
| 805 @item @emph{Description}: | |
| 806 A simple lock about to be unset must have been locked by @code{omp_set_lock} | |
| 807 or @code{omp_test_lock} before. In addition, the lock must be held by the | |
| 808 thread calling @code{omp_unset_lock}. Then, the lock becomes unlocked. If one | |
|
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809 or more threads attempted to set the lock before, one of them is chosen to, |
| 0 | 810 again, set the lock for itself. |
| 811 | |
| 812 @item @emph{C/C++}: | |
| 813 @multitable @columnfractions .20 .80 | |
| 814 @item @emph{Prototype}: @tab @code{void omp_unset_lock(omp_lock_t *lock);} | |
| 815 @end multitable | |
| 816 | |
| 817 @item @emph{Fortran}: | |
| 818 @multitable @columnfractions .20 .80 | |
| 819 @item @emph{Interface}: @tab @code{subroutine omp_unset_lock(lock)} | |
|
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820 @item @tab @code{integer(omp_lock_kind), intent(inout) :: lock} |
| 0 | 821 @end multitable |
| 822 | |
| 823 @item @emph{See also}: | |
| 824 @ref{omp_set_lock}, @ref{omp_test_lock} | |
| 825 | |
| 826 @item @emph{Reference}: | |
| 827 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.4. | |
| 828 @end table | |
| 829 | |
| 830 | |
| 831 | |
| 832 @node omp_destroy_lock | |
| 833 @section @code{omp_destroy_lock} -- Destroy simple lock | |
| 834 @table @asis | |
| 835 @item @emph{Description}: | |
| 836 Destroy a simple lock. In order to be destroyed, a simple lock must be | |
| 837 in the unlocked state. | |
| 838 | |
| 839 @item @emph{C/C++}: | |
| 840 @multitable @columnfractions .20 .80 | |
|
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841 @item @emph{Prototype}: @tab @code{void omp_destroy_lock(omp_lock_t *lock);} |
| 0 | 842 @end multitable |
| 843 | |
| 844 @item @emph{Fortran}: | |
| 845 @multitable @columnfractions .20 .80 | |
| 846 @item @emph{Interface}: @tab @code{subroutine omp_destroy_lock(lock)} | |
| 847 @item @tab @code{integer(omp_lock_kind), intent(inout) :: lock} | |
| 848 @end multitable | |
| 849 | |
| 850 @item @emph{See also}: | |
| 851 @ref{omp_init_lock} | |
| 852 | |
| 853 @item @emph{Reference}: | |
| 854 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.2. | |
| 855 @end table | |
| 856 | |
| 857 | |
| 858 | |
| 859 @node omp_init_nest_lock | |
| 860 @section @code{omp_init_nest_lock} -- Initialize nested lock | |
| 861 @table @asis | |
| 862 @item @emph{Description}: | |
|
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863 Initialize a nested lock. After initialization, the lock is in |
| 0 | 864 an unlocked state and the nesting count is set to zero. |
| 865 | |
| 866 @item @emph{C/C++}: | |
| 867 @multitable @columnfractions .20 .80 | |
| 868 @item @emph{Prototype}: @tab @code{void omp_init_nest_lock(omp_nest_lock_t *lock);} | |
| 869 @end multitable | |
| 870 | |
| 871 @item @emph{Fortran}: | |
| 872 @multitable @columnfractions .20 .80 | |
| 873 @item @emph{Interface}: @tab @code{subroutine omp_init_nest_lock(lock)} | |
| 874 @item @tab @code{integer(omp_nest_lock_kind), intent(out) :: lock} | |
| 875 @end multitable | |
| 876 | |
| 877 @item @emph{See also}: | |
| 878 @ref{omp_destroy_nest_lock} | |
| 879 | |
| 880 @item @emph{Reference}: | |
| 881 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.1. | |
| 882 @end table | |
| 883 | |
| 884 | |
| 885 @node omp_set_nest_lock | |
|
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886 @section @code{omp_set_nest_lock} -- Wait for and set nested lock |
| 0 | 887 @table @asis |
| 888 @item @emph{Description}: | |
| 889 Before setting a nested lock, the lock variable must be initialized by | |
| 890 @code{omp_init_nest_lock}. The calling thread is blocked until the lock | |
| 891 is available. If the lock is already held by the current thread, the | |
| 892 nesting count for the lock in incremented. | |
| 893 | |
| 894 @item @emph{C/C++}: | |
| 895 @multitable @columnfractions .20 .80 | |
| 896 @item @emph{Prototype}: @tab @code{void omp_set_nest_lock(omp_nest_lock_t *lock);} | |
| 897 @end multitable | |
| 898 | |
| 899 @item @emph{Fortran}: | |
| 900 @multitable @columnfractions .20 .80 | |
| 901 @item @emph{Interface}: @tab @code{subroutine omp_set_nest_lock(lock)} | |
|
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902 @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: lock} |
| 0 | 903 @end multitable |
| 904 | |
| 905 @item @emph{See also}: | |
| 906 @ref{omp_init_nest_lock}, @ref{omp_unset_nest_lock} | |
| 907 | |
| 908 @item @emph{Reference}: | |
| 909 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.3. | |
| 910 @end table | |
| 911 | |
| 912 | |
| 913 | |
| 914 @node omp_test_nest_lock | |
| 915 @section @code{omp_test_nest_lock} -- Test and set nested lock if available | |
| 916 @table @asis | |
| 917 @item @emph{Description}: | |
| 918 Before setting a nested lock, the lock variable must be initialized by | |
| 919 @code{omp_init_nest_lock}. Contrary to @code{omp_set_nest_lock}, | |
| 920 @code{omp_test_nest_lock} does not block if the lock is not available. | |
| 921 If the lock is already held by the current thread, the new nesting count | |
| 922 is returned. Otherwise, the return value equals zero. | |
| 923 | |
| 924 @item @emph{C/C++}: | |
| 925 @multitable @columnfractions .20 .80 | |
| 926 @item @emph{Prototype}: @tab @code{int omp_test_nest_lock(omp_nest_lock_t *lock);} | |
| 927 @end multitable | |
| 928 | |
| 929 @item @emph{Fortran}: | |
| 930 @multitable @columnfractions .20 .80 | |
| 931 @item @emph{Interface}: @tab @code{integer function omp_test_nest_lock(lock)} | |
| 932 @item @tab @code{integer(omp_integer_kind) :: omp_test_nest_lock} | |
| 933 @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: lock} | |
| 934 @end multitable | |
| 935 | |
| 936 | |
| 937 @item @emph{See also}: | |
| 938 @ref{omp_init_lock}, @ref{omp_set_lock}, @ref{omp_set_lock} | |
| 939 | |
| 940 @item @emph{Reference}: | |
| 941 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.5. | |
| 942 @end table | |
| 943 | |
| 944 | |
| 945 | |
| 946 @node omp_unset_nest_lock | |
| 947 @section @code{omp_unset_nest_lock} -- Unset nested lock | |
| 948 @table @asis | |
| 949 @item @emph{Description}: | |
| 950 A nested lock about to be unset must have been locked by @code{omp_set_nested_lock} | |
| 951 or @code{omp_test_nested_lock} before. In addition, the lock must be held by the | |
| 952 thread calling @code{omp_unset_nested_lock}. If the nesting count drops to zero, the | |
| 953 lock becomes unlocked. If one ore more threads attempted to set the lock before, | |
| 954 one of them is chosen to, again, set the lock for itself. | |
| 955 | |
| 956 @item @emph{C/C++}: | |
| 957 @multitable @columnfractions .20 .80 | |
| 958 @item @emph{Prototype}: @tab @code{void omp_unset_nest_lock(omp_nest_lock_t *lock);} | |
| 959 @end multitable | |
| 960 | |
| 961 @item @emph{Fortran}: | |
| 962 @multitable @columnfractions .20 .80 | |
| 963 @item @emph{Interface}: @tab @code{subroutine omp_unset_nest_lock(lock)} | |
|
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964 @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: lock} |
| 0 | 965 @end multitable |
| 966 | |
| 967 @item @emph{See also}: | |
| 968 @ref{omp_set_nest_lock} | |
| 969 | |
| 970 @item @emph{Reference}: | |
| 971 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.4. | |
| 972 @end table | |
| 973 | |
| 974 | |
| 975 | |
| 976 @node omp_destroy_nest_lock | |
| 977 @section @code{omp_destroy_nest_lock} -- Destroy nested lock | |
| 978 @table @asis | |
| 979 @item @emph{Description}: | |
| 980 Destroy a nested lock. In order to be destroyed, a nested lock must be | |
| 981 in the unlocked state and its nesting count must equal zero. | |
| 982 | |
| 983 @item @emph{C/C++}: | |
| 984 @multitable @columnfractions .20 .80 | |
| 985 @item @emph{Prototype}: @tab @code{void omp_destroy_nest_lock(omp_nest_lock_t *);} | |
| 986 @end multitable | |
| 987 | |
| 988 @item @emph{Fortran}: | |
| 989 @multitable @columnfractions .20 .80 | |
| 990 @item @emph{Interface}: @tab @code{subroutine omp_destroy_nest_lock(lock)} | |
| 991 @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: lock} | |
| 992 @end multitable | |
| 993 | |
| 994 @item @emph{See also}: | |
| 995 @ref{omp_init_lock} | |
| 996 | |
| 997 @item @emph{Reference}: | |
| 998 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.3.2. | |
| 999 @end table | |
| 1000 | |
| 1001 | |
| 1002 | |
| 1003 @node omp_get_wtick | |
| 1004 @section @code{omp_get_wtick} -- Get timer precision | |
| 1005 @table @asis | |
| 1006 @item @emph{Description}: | |
| 1007 Gets the timer precision, i.e., the number of seconds between two | |
| 1008 successive clock ticks. | |
| 1009 | |
| 1010 @item @emph{C/C++}: | |
| 1011 @multitable @columnfractions .20 .80 | |
|
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1012 @item @emph{Prototype}: @tab @code{double omp_get_wtick(void);} |
| 0 | 1013 @end multitable |
| 1014 | |
| 1015 @item @emph{Fortran}: | |
| 1016 @multitable @columnfractions .20 .80 | |
| 1017 @item @emph{Interface}: @tab @code{double precision function omp_get_wtick()} | |
| 1018 @end multitable | |
| 1019 | |
| 1020 @item @emph{See also}: | |
| 1021 @ref{omp_get_wtime} | |
| 1022 | |
| 1023 @item @emph{Reference}: | |
| 1024 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.4.2. | |
| 1025 @end table | |
| 1026 | |
| 1027 | |
| 1028 | |
| 1029 @node omp_get_wtime | |
| 1030 @section @code{omp_get_wtime} -- Elapsed wall clock time | |
| 1031 @table @asis | |
| 1032 @item @emph{Description}: | |
| 1033 Elapsed wall clock time in seconds. The time is measured per thread, no | |
|
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1034 guarantee can be made that two distinct threads measure the same time. |
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1035 Time is measured from some "time in the past", which is an arbitrary time |
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1036 guaranteed not to change during the execution of the program. |
| 0 | 1037 |
| 1038 @item @emph{C/C++}: | |
| 1039 @multitable @columnfractions .20 .80 | |
|
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1040 @item @emph{Prototype}: @tab @code{double omp_get_wtime(void);} |
| 0 | 1041 @end multitable |
| 1042 | |
| 1043 @item @emph{Fortran}: | |
| 1044 @multitable @columnfractions .20 .80 | |
| 1045 @item @emph{Interface}: @tab @code{double precision function omp_get_wtime()} | |
| 1046 @end multitable | |
| 1047 | |
| 1048 @item @emph{See also}: | |
| 1049 @ref{omp_get_wtick} | |
| 1050 | |
| 1051 @item @emph{Reference}: | |
| 1052 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 3.4.1. | |
| 1053 @end table | |
| 1054 | |
| 1055 | |
| 1056 | |
| 1057 @c --------------------------------------------------------------------- | |
| 1058 @c Environment Variables | |
| 1059 @c --------------------------------------------------------------------- | |
| 1060 | |
| 1061 @node Environment Variables | |
| 1062 @chapter Environment Variables | |
| 1063 | |
| 1064 The variables @env{OMP_DYNAMIC}, @env{OMP_MAX_ACTIVE_LEVELS}, | |
| 1065 @env{OMP_NESTED}, @env{OMP_NUM_THREADS}, @env{OMP_SCHEDULE}, | |
| 1066 @env{OMP_STACKSIZE},@env{OMP_THREAD_LIMIT} and @env{OMP_WAIT_POLICY} | |
| 1067 are defined by section 4 of the OpenMP specifications in version 3.0, | |
| 1068 while @env{GOMP_CPU_AFFINITY} and @env{GOMP_STACKSIZE} are GNU | |
| 1069 extensions. | |
| 1070 | |
| 1071 @menu | |
| 1072 * OMP_DYNAMIC:: Dynamic adjustment of threads | |
|
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1073 * OMP_MAX_ACTIVE_LEVELS:: Set the maximum number of nested parallel regions |
| 0 | 1074 * OMP_NESTED:: Nested parallel regions |
| 1075 * OMP_NUM_THREADS:: Specifies the number of threads to use | |
| 1076 * OMP_STACKSIZE:: Set default thread stack size | |
| 1077 * OMP_SCHEDULE:: How threads are scheduled | |
|
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1078 * OMP_THREAD_LIMIT:: Set the maximum number of threads |
| 0 | 1079 * OMP_WAIT_POLICY:: How waiting threads are handled |
| 1080 * GOMP_CPU_AFFINITY:: Bind threads to specific CPUs | |
| 1081 * GOMP_STACKSIZE:: Set default thread stack size | |
| 1082 @end menu | |
| 1083 | |
| 1084 | |
| 1085 @node OMP_DYNAMIC | |
| 1086 @section @env{OMP_DYNAMIC} -- Dynamic adjustment of threads | |
| 1087 @cindex Environment Variable | |
| 1088 @table @asis | |
| 1089 @item @emph{Description}: | |
| 1090 Enable or disable the dynamic adjustment of the number of threads | |
| 1091 within a team. The value of this environment variable shall be | |
| 1092 @code{TRUE} or @code{FALSE}. If undefined, dynamic adjustment is | |
| 1093 disabled by default. | |
| 1094 | |
| 1095 @item @emph{See also}: | |
| 1096 @ref{omp_set_dynamic} | |
| 1097 | |
| 1098 @item @emph{Reference}: | |
| 1099 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 4.3 | |
| 1100 @end table | |
| 1101 | |
| 1102 | |
| 1103 | |
| 1104 @node OMP_MAX_ACTIVE_LEVELS | |
|
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1105 @section @env{OMP_MAX_ACTIVE_LEVELS} -- Set the maximum number of nested parallel regions |
| 0 | 1106 @cindex Environment Variable |
| 1107 @table @asis | |
| 1108 @item @emph{Description}: | |
|
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1109 Specifies the initial value for the maximum number of nested parallel |
| 0 | 1110 regions. The value of this variable shall be positive integer. |
| 1111 If undefined, the number of active levels is unlimited. | |
| 1112 | |
| 1113 @item @emph{See also}: | |
| 1114 @ref{omp_set_max_active_levels} | |
| 1115 | |
| 1116 @item @emph{Reference}: | |
| 1117 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 4.7 | |
| 1118 @end table | |
| 1119 | |
| 1120 | |
| 1121 | |
| 1122 @node OMP_NESTED | |
| 1123 @section @env{OMP_NESTED} -- Nested parallel regions | |
| 1124 @cindex Environment Variable | |
| 1125 @cindex Implementation specific setting | |
| 1126 @table @asis | |
| 1127 @item @emph{Description}: | |
| 1128 Enable or disable nested parallel regions, i.e., whether team members | |
| 1129 are allowed to create new teams. The value of this environment variable | |
| 1130 shall be @code{TRUE} or @code{FALSE}. If undefined, nested parallel | |
| 1131 regions are disabled by default. | |
| 1132 | |
| 1133 @item @emph{See also}: | |
| 1134 @ref{omp_set_nested} | |
| 1135 | |
| 1136 @item @emph{Reference}: | |
| 1137 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 4.4 | |
| 1138 @end table | |
| 1139 | |
| 1140 | |
| 1141 | |
| 1142 @node OMP_NUM_THREADS | |
| 1143 @section @env{OMP_NUM_THREADS} -- Specifies the number of threads to use | |
| 1144 @cindex Environment Variable | |
| 1145 @cindex Implementation specific setting | |
| 1146 @table @asis | |
| 1147 @item @emph{Description}: | |
| 1148 Specifies the default number of threads to use in parallel regions. The | |
|
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1149 value of this variable shall be a positive integer. If undefined one thread |
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1150 per CPU is used. |
| 0 | 1151 |
| 1152 @item @emph{See also}: | |
| 1153 @ref{omp_set_num_threads} | |
| 1154 | |
| 1155 @item @emph{Reference}: | |
| 1156 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 4.2 | |
| 1157 @end table | |
| 1158 | |
| 1159 | |
| 1160 | |
| 1161 @node OMP_SCHEDULE | |
| 1162 @section @env{OMP_SCHEDULE} -- How threads are scheduled | |
| 1163 @cindex Environment Variable | |
| 1164 @cindex Implementation specific setting | |
| 1165 @table @asis | |
| 1166 @item @emph{Description}: | |
| 1167 Allows to specify @code{schedule type} and @code{chunk size}. | |
| 1168 The value of the variable shall have the form: @code{type[,chunk]} where | |
| 1169 @code{type} is one of @code{static}, @code{dynamic}, @code{guided} or @code{auto} | |
| 1170 The optional @code{chunk} size shall be a positive integer. If undefined, | |
| 1171 dynamic scheduling and a chunk size of 1 is used. | |
| 1172 | |
| 1173 @item @emph{See also}: | |
| 1174 @ref{omp_set_schedule} | |
| 1175 | |
| 1176 @item @emph{Reference}: | |
| 1177 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, sections 2.5.1 and 4.1 | |
| 1178 @end table | |
| 1179 | |
| 1180 | |
| 1181 | |
| 1182 @node OMP_STACKSIZE | |
| 1183 @section @env{OMP_STACKSIZE} -- Set default thread stack size | |
| 1184 @cindex Environment Variable | |
| 1185 @table @asis | |
| 1186 @item @emph{Description}: | |
| 1187 Set the default thread stack size in kilobytes, unless the number | |
| 1188 is suffixed by @code{B}, @code{K}, @code{M} or @code{G}, in which | |
| 1189 case the size is, respectively, in bytes, kilobytes, megabytes | |
| 1190 or gigabytes. This is different from @code{pthread_attr_setstacksize} | |
|
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1191 which gets the number of bytes as an argument. If the stacksize cannot |
| 0 | 1192 be set due to system constraints, an error is reported and the initial |
| 1193 stacksize is left unchanged. If undefined, the stack size is system | |
| 1194 dependent. | |
| 1195 | |
| 1196 @item @emph{Reference}: | |
| 1197 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, sections 4.5 | |
| 1198 @end table | |
| 1199 | |
| 1200 | |
| 1201 | |
| 1202 @node OMP_THREAD_LIMIT | |
|
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1203 @section @env{OMP_THREAD_LIMIT} -- Set the maximum number of threads |
| 0 | 1204 @cindex Environment Variable |
| 1205 @table @asis | |
| 1206 @item @emph{Description}: | |
| 1207 Specifies the number of threads to use for the whole program. The | |
|
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1208 value of this variable shall be a positive integer. If undefined, |
| 0 | 1209 the number of threads is not limited. |
| 1210 | |
| 1211 @item @emph{See also}: | |
| 1212 @ref{OMP_NUM_THREADS} | |
| 1213 @ref{omp_get_thread_limit} | |
| 1214 | |
| 1215 @item @emph{Reference}: | |
| 1216 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, section 4.8 | |
| 1217 @end table | |
| 1218 | |
| 1219 | |
| 1220 | |
| 1221 @node OMP_WAIT_POLICY | |
| 1222 @section @env{OMP_WAIT_POLICY} -- How waiting threads are handled | |
| 1223 @cindex Environment Variable | |
| 1224 @table @asis | |
| 1225 @item @emph{Description}: | |
| 1226 Specifies whether waiting threads should be active or passive. If | |
| 1227 the value is @code{PASSIVE}, waiting threads should not consume CPU | |
| 1228 power while waiting; while the value is @code{ACTIVE} specifies that | |
| 1229 they should. | |
| 1230 | |
| 1231 @item @emph{Reference}: | |
| 1232 @uref{http://www.openmp.org/, OpenMP specifications v3.0}, sections 4.6 | |
| 1233 @end table | |
| 1234 | |
| 1235 | |
| 1236 | |
| 1237 @node GOMP_CPU_AFFINITY | |
| 1238 @section @env{GOMP_CPU_AFFINITY} -- Bind threads to specific CPUs | |
| 1239 @cindex Environment Variable | |
| 1240 @table @asis | |
| 1241 @item @emph{Description}: | |
|
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1242 Binds threads to specific CPUs. The variable should contain a space-separated |
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1243 or comma-separated list of CPUs. This list may contain different kinds of |
| 0 | 1244 entries: either single CPU numbers in any order, a range of CPUs (M-N) |
|
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1245 or a range with some stride (M-N:S). CPU numbers are zero based. For example, |
| 0 | 1246 @code{GOMP_CPU_AFFINITY="0 3 1-2 4-15:2"} will bind the initial thread |
| 1247 to CPU 0, the second to CPU 3, the third to CPU 1, the fourth to | |
| 1248 CPU 2, the fifth to CPU 4, the sixth through tenth to CPUs 6, 8, 10, 12, | |
| 1249 and 14 respectively and then start assigning back from the beginning of | |
|
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1250 the list. @code{GOMP_CPU_AFFINITY=0} binds all threads to CPU 0. |
| 0 | 1251 |
| 1252 There is no GNU OpenMP library routine to determine whether a CPU affinity | |
| 1253 specification is in effect. As a workaround, language-specific library | |
| 1254 functions, e.g., @code{getenv} in C or @code{GET_ENVIRONMENT_VARIABLE} in | |
| 1255 Fortran, may be used to query the setting of the @code{GOMP_CPU_AFFINITY} | |
| 1256 environment variable. A defined CPU affinity on startup cannot be changed | |
| 1257 or disabled during the runtime of the application. | |
| 1258 | |
| 1259 If this environment variable is omitted, the host system will handle the | |
| 1260 assignment of threads to CPUs. | |
| 1261 @end table | |
| 1262 | |
| 1263 | |
| 1264 | |
| 1265 @node GOMP_STACKSIZE | |
| 1266 @section @env{GOMP_STACKSIZE} -- Set default thread stack size | |
| 1267 @cindex Environment Variable | |
| 1268 @cindex Implementation specific setting | |
| 1269 @table @asis | |
| 1270 @item @emph{Description}: | |
| 1271 Set the default thread stack size in kilobytes. This is different from | |
| 1272 @code{pthread_attr_setstacksize} which gets the number of bytes as an | |
|
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1273 argument. If the stacksize cannot be set due to system constraints, an |
| 0 | 1274 error is reported and the initial stacksize is left unchanged. If undefined, |
| 1275 the stack size is system dependent. | |
| 1276 | |
| 1277 @item @emph{See also}: | |
|
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1278 @ref{OMP_STACKSIZE} |
| 0 | 1279 |
| 1280 @item @emph{Reference}: | |
| 1281 @uref{http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00493.html, | |
| 1282 GCC Patches Mailinglist}, | |
| 1283 @uref{http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00496.html, | |
| 1284 GCC Patches Mailinglist} | |
| 1285 @end table | |
| 1286 | |
| 1287 | |
| 1288 | |
| 1289 @c --------------------------------------------------------------------- | |
| 1290 @c The libgomp ABI | |
| 1291 @c --------------------------------------------------------------------- | |
| 1292 | |
| 1293 @node The libgomp ABI | |
| 1294 @chapter The libgomp ABI | |
| 1295 | |
| 1296 The following sections present notes on the external ABI as | |
|
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1297 presented by libgomp. Only maintainers should need them. |
| 0 | 1298 |
| 1299 @menu | |
| 1300 * Implementing MASTER construct:: | |
| 1301 * Implementing CRITICAL construct:: | |
| 1302 * Implementing ATOMIC construct:: | |
| 1303 * Implementing FLUSH construct:: | |
| 1304 * Implementing BARRIER construct:: | |
| 1305 * Implementing THREADPRIVATE construct:: | |
| 1306 * Implementing PRIVATE clause:: | |
| 1307 * Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses:: | |
| 1308 * Implementing REDUCTION clause:: | |
| 1309 * Implementing PARALLEL construct:: | |
| 1310 * Implementing FOR construct:: | |
| 1311 * Implementing ORDERED construct:: | |
| 1312 * Implementing SECTIONS construct:: | |
| 1313 * Implementing SINGLE construct:: | |
| 1314 @end menu | |
| 1315 | |
| 1316 | |
| 1317 @node Implementing MASTER construct | |
| 1318 @section Implementing MASTER construct | |
| 1319 | |
| 1320 @smallexample | |
| 1321 if (omp_get_thread_num () == 0) | |
| 1322 block | |
| 1323 @end smallexample | |
| 1324 | |
| 1325 Alternately, we generate two copies of the parallel subfunction | |
| 1326 and only include this in the version run by the master thread. | |
|
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1327 Surely this is not worthwhile though... |
| 0 | 1328 |
| 1329 | |
| 1330 | |
| 1331 @node Implementing CRITICAL construct | |
| 1332 @section Implementing CRITICAL construct | |
| 1333 | |
| 1334 Without a specified name, | |
| 1335 | |
| 1336 @smallexample | |
| 1337 void GOMP_critical_start (void); | |
| 1338 void GOMP_critical_end (void); | |
| 1339 @end smallexample | |
| 1340 | |
| 1341 so that we don't get COPY relocations from libgomp to the main | |
| 1342 application. | |
| 1343 | |
| 1344 With a specified name, use omp_set_lock and omp_unset_lock with | |
| 1345 name being transformed into a variable declared like | |
| 1346 | |
| 1347 @smallexample | |
| 1348 omp_lock_t gomp_critical_user_<name> __attribute__((common)) | |
| 1349 @end smallexample | |
| 1350 | |
| 1351 Ideally the ABI would specify that all zero is a valid unlocked | |
|
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1352 state, and so we wouldn't need to initialize this at |
| 0 | 1353 startup. |
| 1354 | |
| 1355 | |
| 1356 | |
| 1357 @node Implementing ATOMIC construct | |
| 1358 @section Implementing ATOMIC construct | |
| 1359 | |
| 1360 The target should implement the @code{__sync} builtins. | |
| 1361 | |
| 1362 Failing that we could add | |
| 1363 | |
| 1364 @smallexample | |
| 1365 void GOMP_atomic_enter (void) | |
| 1366 void GOMP_atomic_exit (void) | |
| 1367 @end smallexample | |
| 1368 | |
| 1369 which reuses the regular lock code, but with yet another lock | |
| 1370 object private to the library. | |
| 1371 | |
| 1372 | |
| 1373 | |
| 1374 @node Implementing FLUSH construct | |
| 1375 @section Implementing FLUSH construct | |
| 1376 | |
| 1377 Expands to the @code{__sync_synchronize} builtin. | |
| 1378 | |
| 1379 | |
| 1380 | |
| 1381 @node Implementing BARRIER construct | |
| 1382 @section Implementing BARRIER construct | |
| 1383 | |
| 1384 @smallexample | |
| 1385 void GOMP_barrier (void) | |
| 1386 @end smallexample | |
| 1387 | |
| 1388 | |
| 1389 @node Implementing THREADPRIVATE construct | |
| 1390 @section Implementing THREADPRIVATE construct | |
| 1391 | |
| 1392 In _most_ cases we can map this directly to @code{__thread}. Except | |
| 1393 that OMP allows constructors for C++ objects. We can either | |
| 1394 refuse to support this (how often is it used?) or we can | |
| 1395 implement something akin to .ctors. | |
| 1396 | |
| 1397 Even more ideally, this ctor feature is handled by extensions | |
| 1398 to the main pthreads library. Failing that, we can have a set | |
| 1399 of entry points to register ctor functions to be called. | |
| 1400 | |
| 1401 | |
| 1402 | |
| 1403 @node Implementing PRIVATE clause | |
| 1404 @section Implementing PRIVATE clause | |
| 1405 | |
| 1406 In association with a PARALLEL, or within the lexical extent | |
| 1407 of a PARALLEL block, the variable becomes a local variable in | |
| 1408 the parallel subfunction. | |
| 1409 | |
| 1410 In association with FOR or SECTIONS blocks, create a new | |
| 1411 automatic variable within the current function. This preserves | |
| 1412 the semantic of new variable creation. | |
| 1413 | |
| 1414 | |
| 1415 | |
| 1416 @node Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses | |
| 1417 @section Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses | |
| 1418 | |
|
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1419 This seems simple enough for PARALLEL blocks. Create a private |
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1420 struct for communicating between the parent and subfunction. |
| 0 | 1421 In the parent, copy in values for scalar and "small" structs; |
| 1422 copy in addresses for others TREE_ADDRESSABLE types. In the | |
| 1423 subfunction, copy the value into the local variable. | |
| 1424 | |
|
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1425 It is not clear what to do with bare FOR or SECTION blocks. |
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1426 The only thing I can figure is that we do something like: |
| 0 | 1427 |
| 1428 @smallexample | |
| 1429 #pragma omp for firstprivate(x) lastprivate(y) | |
| 1430 for (int i = 0; i < n; ++i) | |
| 1431 body; | |
| 1432 @end smallexample | |
| 1433 | |
| 1434 which becomes | |
| 1435 | |
| 1436 @smallexample | |
| 1437 @{ | |
| 1438 int x = x, y; | |
| 1439 | |
| 1440 // for stuff | |
| 1441 | |
| 1442 if (i == n) | |
| 1443 y = y; | |
| 1444 @} | |
| 1445 @end smallexample | |
| 1446 | |
| 1447 where the "x=x" and "y=y" assignments actually have different | |
| 1448 uids for the two variables, i.e. not something you could write | |
| 1449 directly in C. Presumably this only makes sense if the "outer" | |
| 1450 x and y are global variables. | |
| 1451 | |
| 1452 COPYPRIVATE would work the same way, except the structure | |
| 1453 broadcast would have to happen via SINGLE machinery instead. | |
| 1454 | |
| 1455 | |
| 1456 | |
| 1457 @node Implementing REDUCTION clause | |
| 1458 @section Implementing REDUCTION clause | |
| 1459 | |
| 1460 The private struct mentioned in the previous section should have | |
| 1461 a pointer to an array of the type of the variable, indexed by the | |
| 1462 thread's @var{team_id}. The thread stores its final value into the | |
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1463 array, and after the barrier, the master thread iterates over the |
| 0 | 1464 array to collect the values. |
| 1465 | |
| 1466 | |
| 1467 @node Implementing PARALLEL construct | |
| 1468 @section Implementing PARALLEL construct | |
| 1469 | |
| 1470 @smallexample | |
| 1471 #pragma omp parallel | |
| 1472 @{ | |
| 1473 body; | |
| 1474 @} | |
| 1475 @end smallexample | |
| 1476 | |
| 1477 becomes | |
| 1478 | |
| 1479 @smallexample | |
| 1480 void subfunction (void *data) | |
| 1481 @{ | |
| 1482 use data; | |
| 1483 body; | |
| 1484 @} | |
| 1485 | |
| 1486 setup data; | |
| 1487 GOMP_parallel_start (subfunction, &data, num_threads); | |
| 1488 subfunction (&data); | |
| 1489 GOMP_parallel_end (); | |
| 1490 @end smallexample | |
| 1491 | |
| 1492 @smallexample | |
| 1493 void GOMP_parallel_start (void (*fn)(void *), void *data, unsigned num_threads) | |
| 1494 @end smallexample | |
| 1495 | |
| 1496 The @var{FN} argument is the subfunction to be run in parallel. | |
| 1497 | |
| 1498 The @var{DATA} argument is a pointer to a structure used to | |
| 1499 communicate data in and out of the subfunction, as discussed | |
| 1500 above with respect to FIRSTPRIVATE et al. | |
| 1501 | |
| 1502 The @var{NUM_THREADS} argument is 1 if an IF clause is present | |
| 1503 and false, or the value of the NUM_THREADS clause, if | |
| 1504 present, or 0. | |
| 1505 | |
| 1506 The function needs to create the appropriate number of | |
| 1507 threads and/or launch them from the dock. It needs to | |
| 1508 create the team structure and assign team ids. | |
| 1509 | |
| 1510 @smallexample | |
| 1511 void GOMP_parallel_end (void) | |
| 1512 @end smallexample | |
| 1513 | |
| 1514 Tears down the team and returns us to the previous @code{omp_in_parallel()} state. | |
| 1515 | |
| 1516 | |
| 1517 | |
| 1518 @node Implementing FOR construct | |
| 1519 @section Implementing FOR construct | |
| 1520 | |
| 1521 @smallexample | |
| 1522 #pragma omp parallel for | |
| 1523 for (i = lb; i <= ub; i++) | |
| 1524 body; | |
| 1525 @end smallexample | |
| 1526 | |
| 1527 becomes | |
| 1528 | |
| 1529 @smallexample | |
| 1530 void subfunction (void *data) | |
| 1531 @{ | |
| 1532 long _s0, _e0; | |
| 1533 while (GOMP_loop_static_next (&_s0, &_e0)) | |
| 1534 @{ | |
| 1535 long _e1 = _e0, i; | |
| 1536 for (i = _s0; i < _e1; i++) | |
| 1537 body; | |
| 1538 @} | |
| 1539 GOMP_loop_end_nowait (); | |
| 1540 @} | |
| 1541 | |
| 1542 GOMP_parallel_loop_static (subfunction, NULL, 0, lb, ub+1, 1, 0); | |
| 1543 subfunction (NULL); | |
| 1544 GOMP_parallel_end (); | |
| 1545 @end smallexample | |
| 1546 | |
| 1547 @smallexample | |
| 1548 #pragma omp for schedule(runtime) | |
| 1549 for (i = 0; i < n; i++) | |
| 1550 body; | |
| 1551 @end smallexample | |
| 1552 | |
| 1553 becomes | |
| 1554 | |
| 1555 @smallexample | |
| 1556 @{ | |
| 1557 long i, _s0, _e0; | |
| 1558 if (GOMP_loop_runtime_start (0, n, 1, &_s0, &_e0)) | |
| 1559 do @{ | |
| 1560 long _e1 = _e0; | |
| 1561 for (i = _s0, i < _e0; i++) | |
| 1562 body; | |
| 1563 @} while (GOMP_loop_runtime_next (&_s0, _&e0)); | |
| 1564 GOMP_loop_end (); | |
| 1565 @} | |
| 1566 @end smallexample | |
| 1567 | |
|
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1568 Note that while it looks like there is trickiness to propagating |
| 0 | 1569 a non-constant STEP, there isn't really. We're explicitly allowed |
| 1570 to evaluate it as many times as we want, and any variables involved | |
| 1571 should automatically be handled as PRIVATE or SHARED like any other | |
| 1572 variables. So the expression should remain evaluable in the | |
| 1573 subfunction. We can also pull it into a local variable if we like, | |
| 1574 but since its supposed to remain unchanged, we can also not if we like. | |
| 1575 | |
| 1576 If we have SCHEDULE(STATIC), and no ORDERED, then we ought to be | |
| 1577 able to get away with no work-sharing context at all, since we can | |
| 1578 simply perform the arithmetic directly in each thread to divide up | |
| 1579 the iterations. Which would mean that we wouldn't need to call any | |
| 1580 of these routines. | |
| 1581 | |
| 1582 There are separate routines for handling loops with an ORDERED | |
| 1583 clause. Bookkeeping for that is non-trivial... | |
| 1584 | |
| 1585 | |
| 1586 | |
| 1587 @node Implementing ORDERED construct | |
| 1588 @section Implementing ORDERED construct | |
| 1589 | |
| 1590 @smallexample | |
| 1591 void GOMP_ordered_start (void) | |
| 1592 void GOMP_ordered_end (void) | |
| 1593 @end smallexample | |
| 1594 | |
| 1595 | |
| 1596 | |
| 1597 @node Implementing SECTIONS construct | |
| 1598 @section Implementing SECTIONS construct | |
| 1599 | |
| 1600 A block as | |
| 1601 | |
| 1602 @smallexample | |
| 1603 #pragma omp sections | |
| 1604 @{ | |
| 1605 #pragma omp section | |
| 1606 stmt1; | |
| 1607 #pragma omp section | |
| 1608 stmt2; | |
| 1609 #pragma omp section | |
| 1610 stmt3; | |
| 1611 @} | |
| 1612 @end smallexample | |
| 1613 | |
| 1614 becomes | |
| 1615 | |
| 1616 @smallexample | |
| 1617 for (i = GOMP_sections_start (3); i != 0; i = GOMP_sections_next ()) | |
| 1618 switch (i) | |
| 1619 @{ | |
| 1620 case 1: | |
| 1621 stmt1; | |
| 1622 break; | |
| 1623 case 2: | |
| 1624 stmt2; | |
| 1625 break; | |
| 1626 case 3: | |
| 1627 stmt3; | |
| 1628 break; | |
| 1629 @} | |
| 1630 GOMP_barrier (); | |
| 1631 @end smallexample | |
| 1632 | |
| 1633 | |
| 1634 @node Implementing SINGLE construct | |
| 1635 @section Implementing SINGLE construct | |
| 1636 | |
| 1637 A block like | |
| 1638 | |
| 1639 @smallexample | |
| 1640 #pragma omp single | |
| 1641 @{ | |
| 1642 body; | |
| 1643 @} | |
| 1644 @end smallexample | |
| 1645 | |
| 1646 becomes | |
| 1647 | |
| 1648 @smallexample | |
| 1649 if (GOMP_single_start ()) | |
| 1650 body; | |
| 1651 GOMP_barrier (); | |
| 1652 @end smallexample | |
| 1653 | |
| 1654 while | |
| 1655 | |
| 1656 @smallexample | |
| 1657 #pragma omp single copyprivate(x) | |
| 1658 body; | |
| 1659 @end smallexample | |
| 1660 | |
| 1661 becomes | |
| 1662 | |
| 1663 @smallexample | |
| 1664 datap = GOMP_single_copy_start (); | |
| 1665 if (datap == NULL) | |
| 1666 @{ | |
| 1667 body; | |
| 1668 data.x = x; | |
| 1669 GOMP_single_copy_end (&data); | |
| 1670 @} | |
| 1671 else | |
| 1672 x = datap->x; | |
| 1673 GOMP_barrier (); | |
| 1674 @end smallexample | |
| 1675 | |
| 1676 | |
| 1677 | |
| 1678 @c --------------------------------------------------------------------- | |
| 1679 @c | |
| 1680 @c --------------------------------------------------------------------- | |
| 1681 | |
| 1682 @node Reporting Bugs | |
| 1683 @chapter Reporting Bugs | |
| 1684 | |
| 1685 Bugs in the GNU OpenMP implementation should be reported via | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1686 @uref{http://gcc.gnu.org/bugzilla/, bugzilla}. For all cases, please add |
| 0 | 1687 "openmp" to the keywords field in the bug report. |
| 1688 | |
| 1689 | |
| 1690 | |
| 1691 @c --------------------------------------------------------------------- | |
| 1692 @c GNU General Public License | |
| 1693 @c --------------------------------------------------------------------- | |
| 1694 | |
| 1695 @include gpl.texi | |
| 1696 | |
| 1697 | |
| 1698 | |
| 1699 @c --------------------------------------------------------------------- | |
| 1700 @c GNU Free Documentation License | |
| 1701 @c --------------------------------------------------------------------- | |
| 1702 | |
| 1703 @include fdl.texi | |
| 1704 | |
| 1705 | |
| 1706 | |
| 1707 @c --------------------------------------------------------------------- | |
| 1708 @c Funding Free Software | |
| 1709 @c --------------------------------------------------------------------- | |
| 1710 | |
| 1711 @include funding.texi | |
| 1712 | |
| 1713 @c --------------------------------------------------------------------- | |
| 1714 @c Index | |
| 1715 @c --------------------------------------------------------------------- | |
| 1716 | |
| 1717 @node Index | |
| 1718 @unnumbered Index | |
| 1719 | |
| 1720 @printindex cp | |
| 1721 | |
| 1722 @bye |