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Add atomics for Watcom/x86 as inline asm

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Partially fixes Bugzilla #3758.
This commit is contained in:
Ozkan Sezer 2017-08-18 16:35:55 -04:00
parent 0216e916d3
commit 29941a2a2b
3 changed files with 56 additions and 1 deletions
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17
src/atomic/SDL_spinlock.c
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@ -32,6 +32,16 @@
#include <atomic.h>
#endif
#if defined(__WATCOMC__) && defined(__386__)
SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock));
extern _inline int _SDL_xchg_watcom(volatile int *a, int v);
#pragma aux _SDL_xchg_watcom = \
"xchg [ecx], eax" \
parm [ecx] [eax] \
value [eax] \
modify exact [eax];
#endif /* __WATCOMC__ && __386__ */
/* This function is where all the magic happens... */
SDL_bool
SDL_AtomicTryLock(SDL_SpinLock *lock)
@ -58,6 +68,9 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long));
return (InterlockedExchange((long*)lock, 1) == 0);
#elif defined(__WATCOMC__) && defined(__386__)
return _SDL_xchg_watcom(lock, 1) == 0;
#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
return (__sync_lock_test_and_set(lock, 1) == 0);
@ -119,6 +132,10 @@ SDL_AtomicUnlock(SDL_SpinLock *lock)
_ReadWriteBarrier();
*lock = 0;
#elif defined(__WATCOMC__) && defined(__386__)
SDL_CompilerBarrier ();
*lock = 0;
#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
__sync_lock_release(lock);