- Added SDL, libjpeg and libpng
- Added Android project and Java files
This commit is contained in:
Xawotihs
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_stdinc.h"
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#include "SDL_atomic.h"
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/* Note that we undefine the atomic operations here, in case they are
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defined as compiler intrinsics while building SDL but the library user
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doesn't have that compiler. That way we always have a working set of
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atomic operations built into the library.
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*/
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/*
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If any of the operations are not provided then we must emulate some
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of them. That means we need a nice implementation of spin locks
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that avoids the "one big lock" problem. We use a vector of spin
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locks and pick which one to use based on the address of the operand
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of the function.
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To generate the index of the lock we first shift by 3 bits to get
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rid on the zero bits that result from 32 and 64 bit allignment of
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data. We then mask off all but 5 bits and use those 5 bits as an
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index into the table.
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Picking the lock this way insures that accesses to the same data at
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the same time will go to the same lock. OTOH, accesses to different
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data have only a 1/32 chance of hitting the same lock. That should
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pretty much eliminate the chances of several atomic operations on
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different data from waiting on the same "big lock". If it isn't
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then the table of locks can be expanded to a new size so long as
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the new size is a power of two.
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Contributed by Bob Pendleton, bob@pendleton.com
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*/
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static SDL_SpinLock locks[32];
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static __inline__ void
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enterLock(void *a)
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{
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uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f);
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SDL_AtomicLock(&locks[index]);
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}
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static __inline__ void
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leaveLock(void *a)
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{
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uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f);
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SDL_AtomicUnlock(&locks[index]);
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}
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SDL_bool
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SDL_AtomicCAS_(SDL_atomic_t *a, int oldval, int newval)
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{
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SDL_bool retval = SDL_FALSE;
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enterLock(a);
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if (a->value == oldval) {
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a->value = newval;
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retval = SDL_TRUE;
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}
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leaveLock(a);
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return retval;
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}
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SDL_bool
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SDL_AtomicCASPtr_(void **a, void *oldval, void *newval)
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{
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SDL_bool retval = SDL_FALSE;
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enterLock(a);
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if (*a == oldval) {
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*a = newval;
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retval = SDL_TRUE;
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}
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leaveLock(a);
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return retval;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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@@ -0,0 +1,110 @@
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_stdinc.h"
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#include "SDL_atomic.h"
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#include "SDL_mutex.h"
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#include "SDL_timer.h"
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/* Don't do the check for Visual Studio 2005, it's safe here */
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#ifdef __WIN32__
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#include "../core/windows/SDL_windows.h"
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#endif
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/* This function is where all the magic happens... */
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SDL_bool
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SDL_AtomicTryLock(SDL_SpinLock *lock)
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{
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#if SDL_ATOMIC_DISABLED
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/* Terrible terrible damage */
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static SDL_mutex *_spinlock_mutex;
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if (!_spinlock_mutex) {
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/* Race condition on first lock... */
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_spinlock_mutex = SDL_CreateMutex();
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}
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SDL_mutexP(_spinlock_mutex);
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if (*lock == 0) {
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*lock = 1;
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SDL_mutexV(_spinlock_mutex);
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return SDL_TRUE;
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} else {
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SDL_mutexV(_spinlock_mutex);
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return SDL_FALSE;
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}
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#elif defined(_MSC_VER)
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SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long));
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return (InterlockedExchange((long*)lock, 1) == 0);
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#elif defined(__MACOSX__)
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return OSAtomicCompareAndSwap32Barrier(0, 1, lock);
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#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
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return (__sync_lock_test_and_set(lock, 1) == 0);
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#elif defined(__GNUC__) && defined(__arm__) && \
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(defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \
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defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5TE__))
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int result;
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__asm__ __volatile__ (
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"swp %0, %1, [%2]\n"
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: "=&r,&r" (result) : "r,0" (1), "r,r" (lock) : "memory");
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return (result == 0);
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#elif defined(__GNUC__) && defined(__arm__)
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int result;
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__asm__ __volatile__ (
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"ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]"
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: "=&r" (result) : "r" (1), "r" (lock) : "cc", "memory");
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return (result == 0);
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#else
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/* Need CPU instructions for spinlock here! */
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__need_spinlock_implementation__
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#endif
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}
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void
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SDL_AtomicLock(SDL_SpinLock *lock)
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{
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/* FIXME: Should we have an eventual timeout? */
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while (!SDL_AtomicTryLock(lock)) {
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SDL_Delay(0);
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}
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}
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void
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SDL_AtomicUnlock(SDL_SpinLock *lock)
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{
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#if defined(_MSC_VER)
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_ReadWriteBarrier();
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*lock = 0;
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#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
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__sync_lock_release(lock);
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#else
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*lock = 0;
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#endif
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}
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/* vi: set ts=4 sw=4 expandtab: */
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