1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
/**
* WARNING(schwerin): Use with extreme caution. Prefer the AtomicWord<> types from atomic_word.h.
*
* The atomic_intrinsics module provides low-level atomic operations for manipulating memory.
* Implementations are platform specific, so this file describes the interface and includes
* the appropriate os/compiler-specific headers.
*
* For supported word types, the atomic_intrinsics headers provide implementations of template
* classes of the following form:
*
* template <typename T> class AtomicIntrinsics {
* static T load(volatile const T* value);
* static T store(volatile T* dest, T newValue);
* static T compareAndSwap(volatile T* dest, T expected, T newValue);
* static T swap(volatile T* dest, T newValue);
* static T fetchAndAdd(volatile T* dest, T increment);
* };
*
* All of the functions assume that the volatile T pointers are naturally aligned, and may not
* operate as expected, if they are not so aligned.
*
* The behavior of the functions is analogous to the same-named member functions of the AtomicWord
* template type in atomic_word.h.
*/
#pragma once
#if defined(_WIN32)
#include "mongo/platform/atomic_intrinsics_win32.h"
#elif defined(MONGO_HAVE_GCC_ATOMIC_BUILTINS)
#include "mongo/platform/atomic_intrinsics_gcc_atomic.h"
#elif defined(MONGO_HAVE_GCC_SYNC_BUILTINS)
#include "mongo/platform/atomic_intrinsics_gcc_sync.h"
#elif defined(__i386__) || defined(__x86_64__)
#include "mongo/platform/atomic_intrinsics_gcc_intel.h"
#else
#error "Unsupported os/compiler family"
#endif
|
