pandory500/SDL-mirror
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Improvements based on feedback from Anthony Williams

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This commit is contained in:
Sam Lantinga 2011-01-25 17:40:06 -08:00
parent c8cd5b9028
commit 29e0bf97e0
4 changed files with 93 additions and 126 deletions
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79
src/atomic/SDL_atomic.c
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@ -70,61 +70,8 @@ leaveLock(void *a)
SDL_AtomicUnlock(&locks[index]);
}
#undef SDL_AtomicSet
int
SDL_AtomicSet(SDL_atomic_t *a, int value)
{
int oldvalue;
enterLock(a);
oldvalue = a->value;
a->value = value;
leaveLock(a);
return oldvalue;
}
#undef SDL_AtomicGet
int
SDL_AtomicGet(SDL_atomic_t *a)
{
/* Assuming integral reads on this platform, we're safe here since the
functions that set the variable have the necessary memory barriers.
*/
return a->value;
}
#undef SDL_AtomicAdd
int
SDL_AtomicAdd(SDL_atomic_t *a, int value)
{
int oldvalue;
enterLock(a);
oldvalue = a->value;
a->value += value;
leaveLock(a);
return oldvalue;
}
#undef SDL_AtomicIncRef
void
SDL_AtomicIncRef(SDL_atomic_t *a)
{
SDL_AtomicAdd(a, 1);
}
#undef SDL_AtomicDecRef
SDL_bool
SDL_AtomicDecRef(SDL_atomic_t *a)
{
return SDL_AtomicAdd(a, -1) == 1;
}
#undef SDL_AtomicCAS
SDL_bool
SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval)
SDL_AtomicCAS_(SDL_atomic_t *a, int oldval, int newval)
{
SDL_bool retval = SDL_FALSE;
@ -138,28 +85,8 @@ SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval)
return retval;
}
#undef SDL_AtomicSetPtr
void
SDL_AtomicSetPtr(void** a, void* value)
{
void *prevval;
do {
prevval = *a;
} while (!SDL_AtomicCASPtr(a, prevval, value));
}
#undef SDL_AtomicGetPtr
void*
SDL_AtomicGetPtr(void** a)
{
/* Assuming integral reads on this platform, we're safe here since the
functions that set the pointer have the necessary memory barriers.
*/
return *a;
}
#undef SDL_AtomicCASPtr
SDL_bool SDL_AtomicCASPtr(void **a, void *oldval, void *newval)
SDL_bool
SDL_AtomicCASPtr_(void **a, void *oldval, void *newval)
{
SDL_bool retval = SDL_FALSE;