1/* Copyright (C) 2008-2017 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
3
4 This file is part of the GNU Transactional Memory Library (libitm).
5
6 Libitm is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25/* The following are internal implementation functions and definitions.
26 To distinguish them from those defined by the Intel ABI, they all
27 begin with GTM/gtm. */
28
29#ifndef COMMON_H
30#define COMMON_H 1
31
32#define UNUSED __attribute__((unused))
33#define ALWAYS_INLINE __attribute__((always_inline))
34#ifdef HAVE_ATTRIBUTE_VISIBILITY
35# define HIDDEN __attribute__((visibility("hidden")))
36#else
37# define HIDDEN
38#endif
39
40#define likely(X) __builtin_expect((X) != 0, 1)
41#define unlikely(X) __builtin_expect((X), 0)
42
43namespace GTM HIDDEN {
44
45// Locally defined protected allocation functions.
46//
47// To avoid dependency on libstdc++ new/delete, as well as to not
48// interfere with the wrapping of the global new/delete we wrap for
49// the user in alloc_cpp.cc, use class-local versions that defer
50// to malloc/free. Recall that operator new/delete does not go through
51// normal lookup and so we cannot simply inject a version into the
52// GTM namespace.
53// If separate_cl is true, the allocator will try to return memory that is on
54// cache lines that are not shared with any object used by another thread.
55extern void * xmalloc (size_t s, bool separate_cl = false)
56 __attribute__((malloc, nothrow));
57extern void * xcalloc (size_t s, bool separate_cl = false)
58 __attribute__((malloc, nothrow));
59extern void * xrealloc (void *p, size_t s, bool separate_cl = false)
60 __attribute__((malloc, nothrow));
61
62} // namespace GTM
63
64
65#endif // COMMON_H
66