Mercurial > sdl-ios-xcode

annotate include/SDL_atomic.h @ 5102:cce11d33d5c6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Ozkan Sezer to slouken The attached small patch updates SDL's libtoolized files for pe-x86_64 magic, ie win/x64.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 26 Jan 2011 12:23:32 -0800
parents 470ede30189c
children aee04c635ec6
rev   line source
3180
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
1 /*
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
2 SDL - Simple DirectMedia Layer
3697
f7b03b6838cb Fixed bug #926
Sam Lantinga <slouken@libsdl.org>
parents: 3407
diff changeset
3 Copyright (C) 1997-2010 Sam Lantinga
3180
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
4
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
5 This library is free software; you can redistribute it and/or
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
6 modify it under the terms of the GNU Lesser General Public
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
7 License as published by the Free Software Foundation; either
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
8 version 2.1 of the License, or (at your option) any later version.
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
9
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
10 This library is distributed in the hope that it will be useful,
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
13 Lesser General Public License for more details.
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
14
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
15 You should have received a copy of the GNU Lesser General Public
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
16 License along with this library; if not, write to the Free Software
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
18
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
19 Sam Lantinga
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
20 slouken@libsdl.org
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
21 */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
22
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
23 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
24 * \file SDL_atomic.h
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
25 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
26 * Atomic operations.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
27 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
28 * IMPORTANT:
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
29 * If you are not an expert in concurrent lockless programming, you should
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
30 * only be using the atomic lock and reference counting functions in this
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
31 * file. In all other cases you should be protecting your data structures
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
32 * with full mutexes.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
33 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
34 * The list of "safe" functions to use are:
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
35 * SDL_AtomicLock()
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
36 * SDL_AtomicUnlock()
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
37 * SDL_AtomicIncRef()
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
38 * SDL_AtomicDecRef()
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
39 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
40 * Seriously, here be dragons!
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
41 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
42 *
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
43 * You can find out a little more about lockless programming and the
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
44 * subtle issues that can arise here:
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
45 * http://msdn.microsoft.com/en-us/library/ee418650%28v=vs.85%29.aspx
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
46 *
5100
470ede30189c Added a FIFO test to the atomic test suite.
Sam Lantinga <slouken@libsdl.org>
parents: 5099
diff changeset
47 * There's also lots of good information here:
470ede30189c Added a FIFO test to the atomic test suite.
Sam Lantinga <slouken@libsdl.org>
parents: 5099
diff changeset
48 * http://www.1024cores.net/home/lock-free-algorithms
470ede30189c Added a FIFO test to the atomic test suite.
Sam Lantinga <slouken@libsdl.org>
parents: 5099
diff changeset
49 *
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
50 * These operations may or may not actually be implemented using
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
51 * processor specific atomic operations. When possible they are
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
52 * implemented as true processor specific atomic operations. When that
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
53 * is not possible the are implemented using locks that *do* use the
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
54 * available atomic operations.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
55 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
56 * All of the atomic operations that modify memory are full memory barriers.
3180
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
57 */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
58
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
59 #ifndef _SDL_atomic_h_
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
60 #define _SDL_atomic_h_
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
61
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
62 #include "SDL_stdinc.h"
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
63 #include "SDL_platform.h"
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
64
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
65 #include "begin_code.h"
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
66
5073
1e94e68525d5 Fixed bug #1097
Sam Lantinga <slouken@libsdl.org>
parents: 5024
diff changeset
67 /* Need to do this here because intrin.h has C++ code in it */
1e94e68525d5 Fixed bug #1097
Sam Lantinga <slouken@libsdl.org>
parents: 5024
diff changeset
68 /* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
5088
c2539ff054c8 Fixed compiling on Windows Mobile SDK 5.0 with Visual Studio 2008
Sam Lantinga <slouken@libsdl.org>
parents: 5073
diff changeset
69 #if defined(_MSC_VER) && (_MSC_VER >= 1500) && !defined(_WIN32_WCE)
5073
1e94e68525d5 Fixed bug #1097
Sam Lantinga <slouken@libsdl.org>
parents: 5024
diff changeset
70 #include <intrin.h>
5098
e4301cde4de1 Fixed compile error on Visual C++
Sam Lantinga <slouken@libsdl.org>
parents: 5097
diff changeset
71 #define HAVE_MSC_ATOMICS 1
5073
1e94e68525d5 Fixed bug #1097
Sam Lantinga <slouken@libsdl.org>
parents: 5024
diff changeset
72 #endif
1e94e68525d5 Fixed bug #1097
Sam Lantinga <slouken@libsdl.org>
parents: 5024
diff changeset
73
3180
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
74 /* Set up for C function definitions, even when using C++ */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
75 #ifdef __cplusplus
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
76 /* *INDENT-OFF* */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
77 extern "C" {
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
78 /* *INDENT-ON* */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
79 #endif
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
80
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
81 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
82 * \name SDL AtomicLock
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
83 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
84 * The atomic locks are efficient spinlocks using CPU instructions,
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
85 * but are vulnerable to starvation and can spin forever if a thread
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
86 * holding a lock has been terminated. For this reason you should
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
87 * minimize the code executed inside an atomic lock and never do
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
88 * expensive things like API or system calls while holding them.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
89 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
90 * The atomic locks are not safe to lock recursively.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
91 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
92 * Porting Note:
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
93 * The spin lock functions and type are required and can not be
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
94 * emulated because they are used in the atomic emulation code.
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
95 */
3407
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
parents: 3261
diff changeset
96 /*@{*/
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
97
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
98 typedef int SDL_SpinLock;
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
99
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
100 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
101 * \brief Try to lock a spin lock by setting it to a non-zero value.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
102 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
103 * \param lock Points to the lock.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
104 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
105 * \return SDL_TRUE if the lock succeeded, SDL_FALSE if the lock is already held.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
106 */
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
107 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock);
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
108
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
109 /**
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
110 * \brief Lock a spin lock by setting it to a non-zero value.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
111 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
112 * \param lock Points to the lock.
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
113 */
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
114 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
115
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
116 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
117 * \brief Unlock a spin lock by setting it to 0. Always returns immediately
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
118 *
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
119 * \param lock Points to the lock.
3261
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
120 */
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
121 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
Bob Pendleton <bob@pendleton.com>
parents: 3237
diff changeset
122
3407
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
parents: 3261
diff changeset
123 /*@}*//*SDL AtomicLock*/
3202
3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
Bob Pendleton <bob@pendleton.com>
parents: 3199
diff changeset
124
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
125
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
126 /* The compiler barrier prevents the compiler from reordering
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
127 reads and writes to globally visible variables across the call.
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
128 */
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
129 #ifdef _MSC_VER
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
130 void _ReadWriteBarrier(void);
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
131 #pragma intrinsic(_ReadWriteBarrier)
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
132 #define SDL_CompilerBarrier() _ReadWriteBarrier()
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
133 #elif defined(__GNUC__)
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
134 #define SDL_CompilerBarrier() __asm__ __volatile__ ("" : : : "memory")
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
135 #else
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
136 #define SDL_CompilerBarrier() \
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
137 ({ SDL_SpinLock _tmp = 0; SDL_AtomicLock(&_tmp); SDL_AtomicUnlock(&_tmp); })
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
138 #endif
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
139
5006
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
140 /* Platform specific optimized versions of the atomic functions,
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
141 * you can disable these by defining SDL_DISABLE_ATOMIC_INLINE
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
142 */
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
143 #ifndef SDL_DISABLE_ATOMIC_INLINE
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
144
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
145 #ifdef HAVE_MSC_ATOMICS
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
146
5016
cc879bc6c4cf Fixed compiler warnings using Windows intrinsics
Sam Lantinga <slouken@libsdl.org>
parents: 5012
diff changeset
147 #define SDL_AtomicSet(a, v) _InterlockedExchange((long*)&(a)->value, (v))
cc879bc6c4cf Fixed compiler warnings using Windows intrinsics
Sam Lantinga <slouken@libsdl.org>
parents: 5012
diff changeset
148 #define SDL_AtomicAdd(a, v) _InterlockedExchangeAdd((long*)&(a)->value, (v))
cc879bc6c4cf Fixed compiler warnings using Windows intrinsics
Sam Lantinga <slouken@libsdl.org>
parents: 5012
diff changeset
149 #define SDL_AtomicCAS(a, oldval, newval) (_InterlockedCompareExchange((long*)&(a)->value, (newval), (oldval)) == (oldval))
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
150 #define SDL_AtomicSetPtr(a, v) _InterlockedExchangePointer((a), (v))
5012
2e282002bac3 Use compiler intrinsics, where available
Sam Lantinga <slouken@libsdl.org>
parents: 5006
diff changeset
151 #if _M_IX86
2e282002bac3 Use compiler intrinsics, where available
Sam Lantinga <slouken@libsdl.org>
parents: 5006
diff changeset
152 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchange((long*)(a), (long)(newval), (long)(oldval)) == (long)(oldval))
2e282002bac3 Use compiler intrinsics, where available
Sam Lantinga <slouken@libsdl.org>
parents: 5006
diff changeset
153 #else
2e282002bac3 Use compiler intrinsics, where available
Sam Lantinga <slouken@libsdl.org>
parents: 5006
diff changeset
154 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchangePointer((a), (newval), (oldval)) == (oldval))
2e282002bac3 Use compiler intrinsics, where available
Sam Lantinga <slouken@libsdl.org>
parents: 5006
diff changeset
155 #endif
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
156
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
157 #elif defined(__MACOSX__)
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
158 #include <libkern/OSAtomic.h>
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
159
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
160 #define SDL_AtomicCAS(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((oldval), (newval), &(a)->value)
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
161 #if SIZEOF_VOIDP == 4
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
162 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((int32_t)(oldval), (int32_t)(newval), (int32_t*)(a))
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
163 #elif SIZEOF_VOIDP == 8
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
164 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap64Barrier((int64_t)(oldval), (int64_t)(newval), (int64_t*)(a))
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
165 #endif
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
166
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
167 #elif defined(HAVE_GCC_ATOMICS)
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
168
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
169 #define SDL_AtomicSet(a, v) __sync_lock_test_and_set(&(a)->value, v)
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
170 #define SDL_AtomicAdd(a, v) __sync_fetch_and_add(&(a)->value, v)
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
171 #define SDL_AtomicSetPtr(a, v) __sync_lock_test_and_set(a, v)
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
172 #define SDL_AtomicCAS(a, oldval, newval) __sync_bool_compare_and_swap(&(a)->value, oldval, newval)
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
173 #define SDL_AtomicCASPtr(a, oldval, newval) __sync_bool_compare_and_swap(a, oldval, newval)
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
174
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
175 #endif
3407
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
parents: 3261
diff changeset
176
5006
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
177 #endif /* !SDL_DISABLE_ATOMIC_INLINE */
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
178
8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
Sam Lantinga <slouken@libsdl.org>
parents: 5005
diff changeset
179
3407
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
parents: 3261
diff changeset
180 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
181 * \brief A type representing an atomic integer value. It is a struct
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
182 * so people don't accidentally use numeric operations on it.
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
183 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
184 #ifndef SDL_atomic_t_defined
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
185 typedef struct { int value; } SDL_atomic_t;
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
186 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
187
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
188 /**
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
189 * \brief Set an atomic variable to a new value if it is currently an old value.
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
190 *
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
191 * \return SDL_TRUE if the atomic variable was set, SDL_FALSE otherwise.
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
192 *
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
193 * \note If you don't know what this function is for, you shouldn't use it!
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
194 */
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
195 #ifndef SDL_AtomicCAS
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
196 #define SDL_AtomicCAS SDL_AtomicCAS_
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
197 #endif
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
198 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS_(SDL_atomic_t *a, int oldval, int newval);
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
199
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
200 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
201 * \brief Set an atomic variable to a value.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
202 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
203 * \return The previous value of the atomic variable.
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
204 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
205 #ifndef SDL_AtomicSet
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
206 static __inline__ int SDL_AtomicSet(SDL_atomic_t *a, int v)
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
207 {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
208 int value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
209 do {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
210 value = a->value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
211 } while (!SDL_AtomicCAS(a, value, v));
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
212 return value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
213 }
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
214 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
215
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
216 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
217 * \brief Get the value of an atomic variable
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
218 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
219 #ifndef SDL_AtomicGet
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
220 static __inline__ int SDL_AtomicGet(SDL_atomic_t *a)
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
221 {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
222 int value = a->value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
223 SDL_CompilerBarrier();
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
224 return value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
225 }
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
226 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
227
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
228 /**
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
229 * \brief Add to an atomic variable.
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
230 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
231 * \return The previous value of the atomic variable.
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
232 *
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
233 * \note This same style can be used for any number operation
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
234 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
235 #ifndef SDL_AtomicAdd
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
236 static __inline__ int SDL_AtomicAdd(SDL_atomic_t *a, int v)
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
237 {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
238 int value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
239 do {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
240 value = a->value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
241 } while (!SDL_AtomicCAS(a, value, (value + v)));
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
242 return value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
243 }
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
244 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
245
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
246 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
247 * \brief Increment an atomic variable used as a reference count.
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
248 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
249 #ifndef SDL_AtomicIncRef
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
250 #define SDL_AtomicIncRef(a) SDL_AtomicAdd(a, 1)
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
251 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
252
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
253 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
254 * \brief Decrement an atomic variable used as a reference count.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
255 *
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
256 * \return SDL_TRUE if the variable reached zero after decrementing,
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
257 * SDL_FALSE otherwise
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
258 */
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
259 #ifndef SDL_AtomicDecRef
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
260 #define SDL_AtomicDecRef(a) (SDL_AtomicAdd(a, -1) == 1)
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
261 #endif
3237
916f396fe65d Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
Bob Pendleton <bob@pendleton.com>
parents: 3216
diff changeset
262
3199
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
Bob Pendleton <bob@pendleton.com>
parents: 3187
diff changeset
263 /**
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
264 * \brief Set a pointer to a new value if it is currently an old value.
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
265 *
5004
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics.
Sam Lantinga <slouken@libsdl.org>
parents: 5003
diff changeset
266 * \return SDL_TRUE if the pointer was set, SDL_FALSE otherwise.
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
267 *
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
268 * \note If you don't know what this function is for, you shouldn't use it!
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
269 */
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
270 #ifndef SDL_AtomicCASPtr
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
271 #define SDL_AtomicCASPtr SDL_AtomicCASPtr_
5003
3a95a2b93eb3 Updated the atomic API for better use cases
Sam Lantinga <slouken@libsdl.org>
parents: 4474
diff changeset
272 #endif
5097
dceec93471e7 Improvements based on feedback from Anthony Williams
Sam Lantinga <slouken@libsdl.org>
parents: 5088
diff changeset
273 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr_(void **a, void *oldval, void *newval);
3407
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
parents: 3261
diff changeset
274
5099
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
275 /**
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
276 * \brief Set a pointer to a value atomically.
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
277 *
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
278 * \return The previous value of the pointer.
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
279 */
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
280 #ifndef SDL_AtomicSetPtr
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
281 static __inline__ void* SDL_AtomicSetPtr(void* *a, void* v)
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
282 {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
283 void* value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
284 do {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
285 value = *a;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
286 } while (!SDL_AtomicCASPtr(a, value, v));
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
287 return value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
288 }
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
289 #endif
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
290
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
291 /**
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
292 * \brief Get the value of a pointer atomically.
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
293 */
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
294 #ifndef SDL_AtomicGetPtr
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
295 static __inline__ void* SDL_AtomicGetPtr(void* *a)
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
296 {
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
297 void* value = *a;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
298 SDL_CompilerBarrier();
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
299 return value;
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
300 }
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
301 #endif
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
302
b938ad843e52 More fixes for compilation on Visual Studio
Sam Lantinga <slouken@libsdl.org>
parents: 5098
diff changeset
303
3180
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
304 /* Ends C function definitions when using C++ */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
305 #ifdef __cplusplus
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
306 /* *INDENT-OFF* */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
307 }
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
308 /* *INDENT-ON* */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
309 #endif
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
310
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
311 #include "close_code.h"
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
312
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
313 #endif /* _SDL_atomic_h_ */
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
314
77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
315 /* vi: set ts=4 sw=4 expandtab: */