sdl-ios-xcode: src/atomic/SDL_spinlock.c annotate

annotate src/atomic/SDL_spinlock.c @ 5282:8e421890cdb8

Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 12 Feb 2011 19:02:14 -0800
parents	b530ef003506
children

rev	line source
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /*
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 SDL - Simple DirectMedia Layer
5267 b530ef003506 Happy 2011! :) Sam Lantinga <slouken@libsdl.org> parents: 5230 diff changeset	3 Copyright (C) 1997-2011 Sam Lantinga
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 This library is free software; you can redistribute it and/or
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	6 modify it under the terms of the GNU Lesser General Public
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 License as published by the Free Software Foundation; either
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	8 version 2.1 of the License, or (at your option) any later version.
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13 Lesser General Public License for more details.
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	15 You should have received a copy of the GNU Lesser General Public
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	16 License along with this library; if not, write to the Free Software
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 Sam Lantinga
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 slouken@libsdl.org
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 */
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	22 #include "SDL_stdinc.h"
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 #include "SDL_atomic.h"
5230 5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	25 #include "SDL_mutex.h"
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 #include "SDL_timer.h"
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27
5073 1e94e68525d5 Fixed bug #1097 Sam Lantinga <slouken@libsdl.org> parents: 5071 diff changeset	28 /* Don't do the check for Visual Studio 2005, it's safe here */
5093 2164a79b5ca9 Only include windows.h on Windows. :) Sam Lantinga <slouken@libsdl.org> parents: 5092 diff changeset	29 #ifdef __WIN32__
5092 327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share. Sam Lantinga <slouken@libsdl.org> parents: 5088 diff changeset	30 #include "../core/windows/SDL_windows.h"
5093 2164a79b5ca9 Only include windows.h on Windows. :) Sam Lantinga <slouken@libsdl.org> parents: 5092 diff changeset	31 #endif
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	32
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	33 /* This function is where all the magic happens... */
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	34 SDL_bool
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	35 SDL_AtomicTryLock(SDL_SpinLock *lock)
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	36 {
5230 5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	37 #if SDL_ATOMIC_DISABLED
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	38 /* Terrible terrible damage */
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	39 static SDL_mutex *_spinlock_mutex;
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	40
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	41 if (!_spinlock_mutex) {
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	42 /* Race condition on first lock... */
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	43 _spinlock_mutex = SDL_CreateMutex();
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	44 }
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	45 SDL_mutexP(_spinlock_mutex);
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	46 if (*lock == 0) {
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	47 *lock = 1;
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	48 SDL_mutexV(_spinlock_mutex);
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	49 return SDL_TRUE;
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	50 } else {
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	51 SDL_mutexV(_spinlock_mutex);
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	52 return SDL_FALSE;
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	53 }
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	54
5d01d426f2ea It's now possible to disable the fast atomic operations, at a huge performance penalty. Sam Lantinga <slouken@libsdl.org> parents: 5099 diff changeset	55 #elif defined(_MSC_VER)
5015 1bf9e38431ec Use compiler intrinsics on Windows Sam Lantinga <slouken@libsdl.org> parents: 5004 diff changeset	56 SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long));
5092 327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share. Sam Lantinga <slouken@libsdl.org> parents: 5088 diff changeset	57 return (InterlockedExchange((long*)lock, 1) == 0);
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	58
5099 b938ad843e52 More fixes for compilation on Visual Studio Sam Lantinga <slouken@libsdl.org> parents: 5097 diff changeset	59 #elif defined(__MACOSX__)
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	60 return OSAtomicCompareAndSwap32Barrier(0, 1, lock);
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	61
5097 dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	62 #elif HAVE_GCC_ATOMICS \|\| HAVE_GCC_SYNC_LOCK_TEST_AND_SET
5004 0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics. Sam Lantinga <slouken@libsdl.org> parents: 5003 diff changeset	63 return (__sync_lock_test_and_set(lock, 1) == 0);
0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics. Sam Lantinga <slouken@libsdl.org> parents: 5003 diff changeset	64
5099 b938ad843e52 More fixes for compilation on Visual Studio Sam Lantinga <slouken@libsdl.org> parents: 5097 diff changeset	65 #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__)
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 int result;
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	67 __asm__ __volatile__ (
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	68 "swp %0, %1, [%2]\n"
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	69 : "=&r,&r" (result) : "r,0" (1), "r,r" (lock) : "memory");
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	70 return (result == 0);
5004 0c72ae7b7cb2 Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics. Sam Lantinga <slouken@libsdl.org> parents: 5003 diff changeset	71
5099 b938ad843e52 More fixes for compilation on Visual Studio Sam Lantinga <slouken@libsdl.org> parents: 5097 diff changeset	72 #elif defined(__GNUC__) && defined(__arm__)
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	73 int result;
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	74 __asm__ __volatile__ (
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	75 "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]"
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	76 : "=&r" (result) : "r" (1), "r" (lock) : "cc", "memory");
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	77 return (result == 0);
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	78
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79 #else
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80 /* Need CPU instructions for spinlock here! */
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 __need_spinlock_implementation__
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	82 #endif
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	83 }
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	85 void
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	86 SDL_AtomicLock(SDL_SpinLock *lock)
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	87 {
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	88 /* FIXME: Should we have an eventual timeout? */
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89 while (!SDL_AtomicTryLock(lock)) {
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	90 SDL_Delay(0);
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	91 }
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	92 }
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	93
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	94 void
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	95 SDL_AtomicUnlock(SDL_SpinLock *lock)
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	96 {
5097 dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	97 #if defined(_MSC_VER)
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	98 _ReadWriteBarrier();
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	99 *lock = 0;
5097 dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	100
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	101 #elif HAVE_GCC_ATOMICS \|\| HAVE_GCC_SYNC_LOCK_TEST_AND_SET
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	102 __sync_lock_release(lock);
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	103
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	104 #else
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	105 *lock = 0;
dceec93471e7 Improvements based on feedback from Anthony Williams Sam Lantinga <slouken@libsdl.org> parents: 5093 diff changeset	106 #endif
5003 3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	107 }
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	108
3a95a2b93eb3 Updated the atomic API for better use cases Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/atomic/SDL_spinlock.c @ 5282:8e421890cdb8