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Work around missing OSAtomicCompareAndSwapPtrBarrier() on OS X 10.4 

Not sure how to handle iOS.
This commit is contained in:
Behdad Esfahbod 2012-12-10 00:57:00 -05:00
parent e923e6487b
commit 071d5b831e
1 changed files with 11 additions and 0 deletions
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11
src/hb-atomic-private.hh
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@ -69,12 +69,23 @@ typedef long hb_atomic_int_t;
#elif !defined(HB_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
#include <AvailabilityMacros.h>
typedef int32_t hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
#define hb_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
#if (MAX_OS_X_VERSION_MAX_ALLOWED >= MAX_OS_X_VERSION_10_5)
/* XXX We should expand the above check to also allow iPhone OS >= 2.0, but I can't find any info re
* AvailabilityMacros.h for iOS. Is it even available there? */
#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
#else
#if __ppc64__ || __x86_64__
#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
#else
#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
#endif
#endif
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)