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0
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1 /* Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This file defines the OpenMP internal control variables, and arranges
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26 for them to be initialized from environment variables at startup. */
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27
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28 #include "libgomp.h"
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29 #include "libgomp_f.h"
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30 #include <ctype.h>
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31 #include <stdlib.h>
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32 #ifdef STRING_WITH_STRINGS
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33 # include <string.h>
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34 # include <strings.h>
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35 #else
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36 # ifdef HAVE_STRING_H
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37 # include <string.h>
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38 # else
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39 # ifdef HAVE_STRINGS_H
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40 # include <strings.h>
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41 # endif
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42 # endif
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43 #endif
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44 #include <limits.h>
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45 #include <errno.h>
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46
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47 #ifndef HAVE_STRTOULL
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48 # define strtoull(ptr, eptr, base) strtoul (ptr, eptr, base)
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49 #endif
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50
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51 struct gomp_task_icv gomp_global_icv = {
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52 .nthreads_var = 1,
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53 .run_sched_var = GFS_DYNAMIC,
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54 .run_sched_modifier = 1,
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55 .dyn_var = false,
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56 .nest_var = false
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57 };
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58
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59 unsigned short *gomp_cpu_affinity;
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60 size_t gomp_cpu_affinity_len;
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61 unsigned long gomp_max_active_levels_var = INT_MAX;
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62 unsigned long gomp_thread_limit_var = ULONG_MAX;
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63 unsigned long gomp_remaining_threads_count;
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64 #ifndef HAVE_SYNC_BUILTINS
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65 gomp_mutex_t gomp_remaining_threads_lock;
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66 #endif
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67 unsigned long gomp_available_cpus = 1, gomp_managed_threads = 1;
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68 unsigned long long gomp_spin_count_var, gomp_throttled_spin_count_var;
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69
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70 /* Parse the OMP_SCHEDULE environment variable. */
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71
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72 static void
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73 parse_schedule (void)
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74 {
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75 char *env, *end;
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76 unsigned long value;
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77
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78 env = getenv ("OMP_SCHEDULE");
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79 if (env == NULL)
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80 return;
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81
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82 while (isspace ((unsigned char) *env))
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83 ++env;
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84 if (strncasecmp (env, "static", 6) == 0)
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85 {
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86 gomp_global_icv.run_sched_var = GFS_STATIC;
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87 env += 6;
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88 }
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89 else if (strncasecmp (env, "dynamic", 7) == 0)
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90 {
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91 gomp_global_icv.run_sched_var = GFS_DYNAMIC;
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92 env += 7;
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93 }
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94 else if (strncasecmp (env, "guided", 6) == 0)
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95 {
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96 gomp_global_icv.run_sched_var = GFS_GUIDED;
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97 env += 6;
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98 }
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99 else if (strncasecmp (env, "auto", 4) == 0)
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100 {
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101 gomp_global_icv.run_sched_var = GFS_AUTO;
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102 env += 4;
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103 }
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104 else
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105 goto unknown;
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106
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107 while (isspace ((unsigned char) *env))
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108 ++env;
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109 if (*env == '\0')
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110 return;
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111 if (*env++ != ',')
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112 goto unknown;
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113 while (isspace ((unsigned char) *env))
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114 ++env;
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115 if (*env == '\0')
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116 goto invalid;
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117
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118 errno = 0;
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119 value = strtoul (env, &end, 10);
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120 if (errno)
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121 goto invalid;
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122
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123 while (isspace ((unsigned char) *end))
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124 ++end;
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125 if (*end != '\0')
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126 goto invalid;
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127
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128 if ((int)value != value)
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129 goto invalid;
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130
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131 gomp_global_icv.run_sched_modifier = value;
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132 return;
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133
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134 unknown:
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135 gomp_error ("Unknown value for environment variable OMP_SCHEDULE");
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136 return;
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137
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138 invalid:
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139 gomp_error ("Invalid value for chunk size in "
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140 "environment variable OMP_SCHEDULE");
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141 return;
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142 }
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143
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144 /* Parse an unsigned long environment variable. Return true if one was
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145 present and it was successfully parsed. */
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146
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147 static bool
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148 parse_unsigned_long (const char *name, unsigned long *pvalue)
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149 {
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150 char *env, *end;
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151 unsigned long value;
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152
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153 env = getenv (name);
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154 if (env == NULL)
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155 return false;
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156
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157 while (isspace ((unsigned char) *env))
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158 ++env;
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159 if (*env == '\0')
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160 goto invalid;
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161
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162 errno = 0;
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163 value = strtoul (env, &end, 10);
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164 if (errno || (long) value <= 0)
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165 goto invalid;
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166
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167 while (isspace ((unsigned char) *end))
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168 ++end;
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169 if (*end != '\0')
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170 goto invalid;
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171
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172 *pvalue = value;
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173 return true;
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174
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175 invalid:
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176 gomp_error ("Invalid value for environment variable %s", name);
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177 return false;
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178 }
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179
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180 /* Parse the OMP_STACKSIZE environment varible. Return true if one was
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181 present and it was successfully parsed. */
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182
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183 static bool
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184 parse_stacksize (const char *name, unsigned long *pvalue)
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185 {
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186 char *env, *end;
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187 unsigned long value, shift = 10;
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188
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189 env = getenv (name);
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190 if (env == NULL)
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191 return false;
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192
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193 while (isspace ((unsigned char) *env))
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194 ++env;
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195 if (*env == '\0')
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196 goto invalid;
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197
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198 errno = 0;
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199 value = strtoul (env, &end, 10);
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200 if (errno)
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201 goto invalid;
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202
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203 while (isspace ((unsigned char) *end))
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204 ++end;
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205 if (*end != '\0')
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206 {
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207 switch (tolower ((unsigned char) *end))
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208 {
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209 case 'b':
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210 shift = 0;
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211 break;
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212 case 'k':
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213 break;
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214 case 'm':
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215 shift = 20;
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216 break;
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217 case 'g':
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218 shift = 30;
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219 break;
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220 default:
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221 goto invalid;
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222 }
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223 ++end;
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224 while (isspace ((unsigned char) *end))
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225 ++end;
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226 if (*end != '\0')
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227 goto invalid;
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228 }
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229
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230 if (((value << shift) >> shift) != value)
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231 goto invalid;
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232
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233 *pvalue = value << shift;
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234 return true;
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235
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236 invalid:
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237 gomp_error ("Invalid value for environment variable %s", name);
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238 return false;
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239 }
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240
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241 /* Parse the GOMP_SPINCOUNT environment varible. Return true if one was
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242 present and it was successfully parsed. */
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243
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244 static bool
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245 parse_spincount (const char *name, unsigned long long *pvalue)
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246 {
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247 char *env, *end;
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248 unsigned long long value, mult = 1;
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249
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250 env = getenv (name);
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251 if (env == NULL)
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252 return false;
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253
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254 while (isspace ((unsigned char) *env))
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255 ++env;
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256 if (*env == '\0')
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257 goto invalid;
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258
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259 if (strncasecmp (env, "infinite", 8) == 0
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260 || strncasecmp (env, "infinity", 8) == 0)
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261 {
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262 value = ~0ULL;
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263 end = env + 8;
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264 goto check_tail;
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265 }
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266
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267 errno = 0;
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268 value = strtoull (env, &end, 10);
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269 if (errno)
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270 goto invalid;
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271
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272 while (isspace ((unsigned char) *end))
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273 ++end;
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274 if (*end != '\0')
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275 {
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276 switch (tolower ((unsigned char) *end))
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277 {
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278 case 'k':
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279 mult = 1000LL;
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280 break;
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281 case 'm':
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282 mult = 1000LL * 1000LL;
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283 break;
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284 case 'g':
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285 mult = 1000LL * 1000LL * 1000LL;
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286 break;
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287 case 't':
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288 mult = 1000LL * 1000LL * 1000LL * 1000LL;
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289 break;
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290 default:
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291 goto invalid;
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292 }
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293 ++end;
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294 check_tail:
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295 while (isspace ((unsigned char) *end))
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296 ++end;
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297 if (*end != '\0')
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298 goto invalid;
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299 }
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300
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301 if (value > ~0ULL / mult)
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302 value = ~0ULL;
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303 else
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304 value *= mult;
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305
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306 *pvalue = value;
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307 return true;
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308
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309 invalid:
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310 gomp_error ("Invalid value for environment variable %s", name);
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311 return false;
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312 }
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313
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314 /* Parse a boolean value for environment variable NAME and store the
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315 result in VALUE. */
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316
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317 static void
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318 parse_boolean (const char *name, bool *value)
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319 {
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320 const char *env;
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321
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322 env = getenv (name);
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323 if (env == NULL)
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324 return;
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325
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326 while (isspace ((unsigned char) *env))
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327 ++env;
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328 if (strncasecmp (env, "true", 4) == 0)
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329 {
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330 *value = true;
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331 env += 4;
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332 }
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333 else if (strncasecmp (env, "false", 5) == 0)
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334 {
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335 *value = false;
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336 env += 5;
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337 }
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338 else
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339 env = "X";
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340 while (isspace ((unsigned char) *env))
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341 ++env;
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342 if (*env != '\0')
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343 gomp_error ("Invalid value for environment variable %s", name);
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344 }
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345
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346 /* Parse the OMP_WAIT_POLICY environment variable and store the
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347 result in gomp_active_wait_policy. */
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348
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349 static int
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350 parse_wait_policy (void)
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351 {
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352 const char *env;
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353 int ret = -1;
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354
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355 env = getenv ("OMP_WAIT_POLICY");
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356 if (env == NULL)
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357 return -1;
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358
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359 while (isspace ((unsigned char) *env))
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360 ++env;
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361 if (strncasecmp (env, "active", 6) == 0)
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362 {
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363 ret = 1;
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364 env += 6;
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365 }
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366 else if (strncasecmp (env, "passive", 7) == 0)
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367 {
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368 ret = 0;
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369 env += 7;
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370 }
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371 else
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372 env = "X";
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373 while (isspace ((unsigned char) *env))
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374 ++env;
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375 if (*env == '\0')
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376 return ret;
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377 gomp_error ("Invalid value for environment variable OMP_WAIT_POLICY");
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378 return -1;
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379 }
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380
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381 /* Parse the GOMP_CPU_AFFINITY environment varible. Return true if one was
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382 present and it was successfully parsed. */
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383
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384 static bool
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385 parse_affinity (void)
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386 {
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387 char *env, *end;
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388 unsigned long cpu_beg, cpu_end, cpu_stride;
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389 unsigned short *cpus = NULL;
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390 size_t allocated = 0, used = 0, needed;
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391
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392 env = getenv ("GOMP_CPU_AFFINITY");
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393 if (env == NULL)
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394 return false;
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395
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396 do
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397 {
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398 while (*env == ' ' || *env == '\t')
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399 env++;
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400
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401 cpu_beg = strtoul (env, &end, 0);
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402 cpu_end = cpu_beg;
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403 cpu_stride = 1;
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404 if (env == end || cpu_beg >= 65536)
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405 goto invalid;
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406
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407 env = end;
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408 if (*env == '-')
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409 {
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410 cpu_end = strtoul (++env, &end, 0);
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411 if (env == end || cpu_end >= 65536 || cpu_end < cpu_beg)
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412 goto invalid;
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413
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414 env = end;
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415 if (*env == ':')
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416 {
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417 cpu_stride = strtoul (++env, &end, 0);
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418 if (env == end || cpu_stride == 0 || cpu_stride >= 65536)
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419 goto invalid;
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420
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421 env = end;
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422 }
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423 }
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424
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425 needed = (cpu_end - cpu_beg) / cpu_stride + 1;
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426 if (used + needed >= allocated)
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427 {
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428 unsigned short *new_cpus;
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429
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430 if (allocated < 64)
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431 allocated = 64;
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432 if (allocated > needed)
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433 allocated <<= 1;
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434 else
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435 allocated += 2 * needed;
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436 new_cpus = realloc (cpus, allocated * sizeof (unsigned short));
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437 if (new_cpus == NULL)
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438 {
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439 free (cpus);
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440 gomp_error ("not enough memory to store GOMP_CPU_AFFINITY list");
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441 return false;
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442 }
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443
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444 cpus = new_cpus;
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445 }
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446
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447 while (needed--)
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448 {
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449 cpus[used++] = cpu_beg;
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450 cpu_beg += cpu_stride;
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451 }
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452
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453 while (*env == ' ' || *env == '\t')
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454 env++;
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455
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456 if (*env == ',')
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457 env++;
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458 else if (*env == '\0')
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459 break;
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460 }
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461 while (1);
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462
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463 gomp_cpu_affinity = cpus;
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464 gomp_cpu_affinity_len = used;
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465 return true;
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466
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467 invalid:
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468 gomp_error ("Invalid value for enviroment variable GOMP_CPU_AFFINITY");
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469 return false;
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470 }
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471
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472 static void __attribute__((constructor))
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473 initialize_env (void)
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474 {
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475 unsigned long stacksize;
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476 int wait_policy;
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477
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478 /* Do a compile time check that mkomp_h.pl did good job. */
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479 omp_check_defines ();
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480
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481 parse_schedule ();
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482 parse_boolean ("OMP_DYNAMIC", &gomp_global_icv.dyn_var);
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483 parse_boolean ("OMP_NESTED", &gomp_global_icv.nest_var);
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484 parse_unsigned_long ("OMP_MAX_ACTIVE_LEVELS", &gomp_max_active_levels_var);
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485 parse_unsigned_long ("OMP_THREAD_LIMIT", &gomp_thread_limit_var);
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486 if (gomp_thread_limit_var != ULONG_MAX)
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487 gomp_remaining_threads_count = gomp_thread_limit_var - 1;
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488 #ifndef HAVE_SYNC_BUILTINS
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489 gomp_mutex_init (&gomp_remaining_threads_lock);
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490 #endif
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491 gomp_init_num_threads ();
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492 gomp_available_cpus = gomp_global_icv.nthreads_var;
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493 if (!parse_unsigned_long ("OMP_NUM_THREADS", &gomp_global_icv.nthreads_var))
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494 gomp_global_icv.nthreads_var = gomp_available_cpus;
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495 if (parse_affinity ())
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496 gomp_init_affinity ();
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497 wait_policy = parse_wait_policy ();
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498 if (!parse_spincount ("GOMP_SPINCOUNT", &gomp_spin_count_var))
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499 {
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500 /* Using a rough estimation of 100000 spins per msec,
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501 use 5 min blocking for OMP_WAIT_POLICY=active,
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502 200 msec blocking when OMP_WAIT_POLICY is not specificed
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503 and 0 when OMP_WAIT_POLICY=passive.
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504 Depending on the CPU speed, this can be e.g. 5 times longer
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505 or 5 times shorter. */
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506 if (wait_policy > 0)
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507 gomp_spin_count_var = 30000000000LL;
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508 else if (wait_policy < 0)
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509 gomp_spin_count_var = 20000000LL;
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510 }
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|
511 /* gomp_throttled_spin_count_var is used when there are more libgomp
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|
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512 managed threads than available CPUs. Use very short spinning. */
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513 if (wait_policy > 0)
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|
|
514 gomp_throttled_spin_count_var = 1000LL;
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|
515 else if (wait_policy < 0)
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|
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516 gomp_throttled_spin_count_var = 100LL;
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|
|
517 if (gomp_throttled_spin_count_var > gomp_spin_count_var)
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|
|
518 gomp_throttled_spin_count_var = gomp_spin_count_var;
|
|
|
519
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|
|
520 /* Not strictly environment related, but ordering constructors is tricky. */
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|
|
521 pthread_attr_init (&gomp_thread_attr);
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|
|
522 pthread_attr_setdetachstate (&gomp_thread_attr, PTHREAD_CREATE_DETACHED);
|
|
|
523
|
|
|
524 if (parse_stacksize ("OMP_STACKSIZE", &stacksize)
|
|
|
525 || parse_stacksize ("GOMP_STACKSIZE", &stacksize))
|
|
|
526 {
|
|
|
527 int err;
|
|
|
528
|
|
|
529 err = pthread_attr_setstacksize (&gomp_thread_attr, stacksize);
|
|
|
530
|
|
|
531 #ifdef PTHREAD_STACK_MIN
|
|
|
532 if (err == EINVAL)
|
|
|
533 {
|
|
|
534 if (stacksize < PTHREAD_STACK_MIN)
|
|
|
535 gomp_error ("Stack size less than minimum of %luk",
|
|
|
536 PTHREAD_STACK_MIN / 1024ul
|
|
|
537 + (PTHREAD_STACK_MIN % 1024 != 0));
|
|
|
538 else
|
|
|
539 gomp_error ("Stack size larger than system limit");
|
|
|
540 }
|
|
|
541 else
|
|
|
542 #endif
|
|
|
543 if (err != 0)
|
|
|
544 gomp_error ("Stack size change failed: %s", strerror (err));
|
|
|
545 }
|
|
|
546 }
|
|
|
547
|
|
|
548
|
|
|
549 /* The public OpenMP API routines that access these variables. */
|
|
|
550
|
|
|
551 void
|
|
|
552 omp_set_num_threads (int n)
|
|
|
553 {
|
|
|
554 struct gomp_task_icv *icv = gomp_icv (true);
|
|
|
555 icv->nthreads_var = (n > 0 ? n : 1);
|
|
|
556 }
|
|
|
557
|
|
|
558 void
|
|
|
559 omp_set_dynamic (int val)
|
|
|
560 {
|
|
|
561 struct gomp_task_icv *icv = gomp_icv (true);
|
|
|
562 icv->dyn_var = val;
|
|
|
563 }
|
|
|
564
|
|
|
565 int
|
|
|
566 omp_get_dynamic (void)
|
|
|
567 {
|
|
|
568 struct gomp_task_icv *icv = gomp_icv (false);
|
|
|
569 return icv->dyn_var;
|
|
|
570 }
|
|
|
571
|
|
|
572 void
|
|
|
573 omp_set_nested (int val)
|
|
|
574 {
|
|
|
575 struct gomp_task_icv *icv = gomp_icv (true);
|
|
|
576 icv->nest_var = val;
|
|
|
577 }
|
|
|
578
|
|
|
579 int
|
|
|
580 omp_get_nested (void)
|
|
|
581 {
|
|
|
582 struct gomp_task_icv *icv = gomp_icv (false);
|
|
|
583 return icv->nest_var;
|
|
|
584 }
|
|
|
585
|
|
|
586 void
|
|
|
587 omp_set_schedule (omp_sched_t kind, int modifier)
|
|
|
588 {
|
|
|
589 struct gomp_task_icv *icv = gomp_icv (true);
|
|
|
590 switch (kind)
|
|
|
591 {
|
|
|
592 case omp_sched_static:
|
|
|
593 if (modifier < 1)
|
|
|
594 modifier = 0;
|
|
|
595 icv->run_sched_modifier = modifier;
|
|
|
596 break;
|
|
|
597 case omp_sched_dynamic:
|
|
|
598 case omp_sched_guided:
|
|
|
599 if (modifier < 1)
|
|
|
600 modifier = 1;
|
|
|
601 icv->run_sched_modifier = modifier;
|
|
|
602 break;
|
|
|
603 case omp_sched_auto:
|
|
|
604 break;
|
|
|
605 default:
|
|
|
606 return;
|
|
|
607 }
|
|
|
608 icv->run_sched_var = kind;
|
|
|
609 }
|
|
|
610
|
|
|
611 void
|
|
|
612 omp_get_schedule (omp_sched_t *kind, int *modifier)
|
|
|
613 {
|
|
|
614 struct gomp_task_icv *icv = gomp_icv (false);
|
|
|
615 *kind = icv->run_sched_var;
|
|
|
616 *modifier = icv->run_sched_modifier;
|
|
|
617 }
|
|
|
618
|
|
|
619 int
|
|
|
620 omp_get_max_threads (void)
|
|
|
621 {
|
|
|
622 struct gomp_task_icv *icv = gomp_icv (false);
|
|
|
623 return icv->nthreads_var;
|
|
|
624 }
|
|
|
625
|
|
|
626 int
|
|
|
627 omp_get_thread_limit (void)
|
|
|
628 {
|
|
|
629 return gomp_thread_limit_var > INT_MAX ? INT_MAX : gomp_thread_limit_var;
|
|
|
630 }
|
|
|
631
|
|
|
632 void
|
|
|
633 omp_set_max_active_levels (int max_levels)
|
|
|
634 {
|
|
|
635 if (max_levels > 0)
|
|
|
636 gomp_max_active_levels_var = max_levels;
|
|
|
637 }
|
|
|
638
|
|
|
639 int
|
|
|
640 omp_get_max_active_levels (void)
|
|
|
641 {
|
|
|
642 return gomp_max_active_levels_var;
|
|
|
643 }
|
|
|
644
|
|
|
645 ialias (omp_set_dynamic)
|
|
|
646 ialias (omp_set_nested)
|
|
|
647 ialias (omp_set_num_threads)
|
|
|
648 ialias (omp_get_dynamic)
|
|
|
649 ialias (omp_get_nested)
|
|
|
650 ialias (omp_set_schedule)
|
|
|
651 ialias (omp_get_schedule)
|
|
|
652 ialias (omp_get_max_threads)
|
|
|
653 ialias (omp_get_thread_limit)
|
|
|
654 ialias (omp_set_max_active_levels)
|
|
|
655 ialias (omp_get_max_active_levels)
|
