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1 /* Copyright (C) 2008-2020 Free Software Foundation, Inc.
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111
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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 Transactional Memory Library (libitm).
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5
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6 Libitm 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 of the License, or
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9 (at your option) any later version.
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10
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11 Libitm 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 /* The following are internal implementation functions and definitions.
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26 To distinguish them from those defined by the Intel ABI, they all
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27 begin with GTM/gtm. */
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28
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29 #ifndef COMMON_H
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30 #define COMMON_H 1
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31
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32 #define UNUSED __attribute__((unused))
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33 #define ALWAYS_INLINE __attribute__((always_inline))
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34 #ifdef HAVE_ATTRIBUTE_VISIBILITY
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35 # define HIDDEN __attribute__((visibility("hidden")))
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36 #else
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37 # define HIDDEN
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38 #endif
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39
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40 #define likely(X) __builtin_expect((X) != 0, 1)
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41 #define unlikely(X) __builtin_expect((X), 0)
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42
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43 namespace GTM HIDDEN {
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44
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45 // Locally defined protected allocation functions.
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46 //
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47 // To avoid dependency on libstdc++ new/delete, as well as to not
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48 // interfere with the wrapping of the global new/delete we wrap for
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49 // the user in alloc_cpp.cc, use class-local versions that defer
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50 // to malloc/free. Recall that operator new/delete does not go through
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51 // normal lookup and so we cannot simply inject a version into the
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52 // GTM namespace.
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53 // If separate_cl is true, the allocator will try to return memory that is on
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54 // cache lines that are not shared with any object used by another thread.
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55 extern void * xmalloc (size_t s, bool separate_cl = false)
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56 __attribute__((malloc, nothrow));
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57 extern void * xcalloc (size_t s, bool separate_cl = false)
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58 __attribute__((malloc, nothrow));
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59 extern void * xrealloc (void *p, size_t s, bool separate_cl = false)
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60 __attribute__((malloc, nothrow));
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61
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62 } // namespace GTM
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63
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64
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65 #endif // COMMON_H
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