AuroraMiddleware/harfbuzz
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Add atomic-pointer functions

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Gonig to use these for lock-free linked-lists, to be used for
hb_language_t among other things.
This commit is contained in:
Behdad Esfahbod 2012-06-05 17:27:20 -04:00
parent cdafe3a7d8
commit 6843ce01be
1 changed files with 21 additions and 0 deletions
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21
src/hb-atomic-private.hh
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@ -45,22 +45,34 @@
#elif !defined(HB_NO_MT) && defined(_MSC_VER) && _MSC_VER >= 1600
#include <intrin.h>
#pragma intrinsic(_InterlockedExchangeAdd, _InterlockedCompareExchangePointer)
typedef long hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) _InterlockedExchangeAdd (&(AI), (V))
#define hb_atomic_ptr_get(P) (MemoryBarrier (), (void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) (_InterlockedCompareExchangePointer ((void * volatile *) (P), (N), (O)) == (O))
#elif !defined(HB_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.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))
#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((O), (N), (void * volatile *) (P))
#elif !defined(HB_NO_MT) && defined(__GNUC__)
typedef int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V))
#define hb_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(HB_NO_MT) && defined(HAVE_GLIB)
#include <glib.h>
@ -71,6 +83,9 @@ typedef int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) g_atomic_int_exchange_and_add (&(AI), (V))
#endif
#define hb_atomic_ptr_get(P) g_atomic_pointer_get (P)
#define hb_atomic_ptr_cmpexch(P,O,N) g_atomic_pointer_compare_and_exchange ((void * volatile *) (P), (O), (N))
#elif !defined(HB_NO_MT)
@ -78,12 +93,18 @@ typedef int hb_atomic_int_t;
typedef volatile int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
#define hb_atomic_ptr_get(P) ((void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) (*(P) == (O) ? (*(P) = (N), TRUE) : FALSE)
#else /* HB_NO_MT */
typedef int hb_atomic_int_t;
#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
#define hb_atomic_ptr_get(P) ((void *) *(P))
#define hb_atomic_ptr_cmpexch(P,O,N) *(P)
#endif
/* TODO Add tracing. */