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[win32] Remove MemoryBarrier() fallback implementation 

I added these because the older mingw32 toolchain didn't have
MemoryBarrier().  The newer mingw-w64 toolchain however has.
As reported by John Emmas this was causing build failure with
MSVC (on glib) because of inline issues.  But that reminded me
that we may be taking this path even if the system implements
MemoryBarrier as a function, which is a waste.  So, just remove
it.
This commit is contained in:
Behdad Esfahbod 2013-03-07 20:51:30 -05:00
parent ea11abfc5d
commit 2761e8a632
1 changed files with 1 additions and 13 deletions
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14
src/hb-atomic-private.hh
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@ -47,22 +47,10 @@
#define WIN32_LEAN_AND_MEAN
#include <windows.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) {
long dummy = 0;
InterlockedExchange (&dummy, 1);
}
#endif
typedef LONG hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
#define hb_atomic_ptr_get(P) (HBMemoryBarrier (), (void *) *(P))
#define hb_atomic_ptr_get(P) (MemoryBarrier (), (void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))