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Update mingw32 MemoryBarrier from HarfBuzz 

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=81228
This commit is contained in:
Behdad Esfahbod 2014-07-11 12:19:39 -04:00
parent dca5d0feee
commit 6781c6baef
1 changed files with 9 additions and 9 deletions
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18
src/fcatomic.h
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@ -48,22 +48,22 @@
#include "fcwindows.h"
/* mingw32 does not have MemoryBarrier.
* MemoryBarrier may be defined as a macro or a function.
* Just make a failsafe version for ourselves. */
#ifdef MemoryBarrier
#define HBMemoryBarrier MemoryBarrier
#else
static inline void HBMemoryBarrier (void) {
/* MinGW has a convoluted history of supporting MemoryBarrier
* properly. As such, define a function to wrap the whole
* thing. */
static inline void _FCMemoryBarrier (void) {
#if !defined(MemoryBarrier)
long dummy = 0;
InterlockedExchange (&dummy, 1);
}
#else
MemoryBarrier ();
#endif
}
typedef LONG fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
#define fc_atomic_ptr_get(P) (HBMemoryBarrier (), (void *) *(P))
#define fc_atomic_ptr_get(P) (_FCMemoryBarrier (), (void *) *(P))
#define fc_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))