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atomics: Favor compiler primitives over macOS APIs. (#676)

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In macOS 10.12, the `OSMemoryBarrier` and related APIs were deprecated
in favor of using `std::atomic`. On the way to supporting `std::atomic`,
we can favor using the "Intel primitives" which are also available on
macOS.
pull/679/head
Bruce Mitchener 7 years ago committed by Ebrahim Byagowi
parent 4f80078eb0
commit 8a0952db7e
1 changed files with 23 additions and 23 deletions
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  1. 46
      src/hb-atomic-private.hh

46
src/hb-atomic-private.hh
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@ -70,6 +70,29 @@ typedef LONG hb_atomic_int_impl_t;
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
typedef int hb_atomic_int_impl_t;
#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
#define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add (&(AI), (V))
#define hb_atomic_ptr_impl_get(P) (void *) (__sync_synchronize (), *(P))
#define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
#include <atomic.h>
#include <mbarrier.h>
typedef unsigned int hb_atomic_int_impl_t;
#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
#define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
#define hb_atomic_ptr_impl_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
#define hb_atomic_ptr_impl_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
#elif !defined(HB_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
@ -96,29 +119,6 @@ typedef int32_t hb_atomic_int_impl_t;
#endif
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
typedef int hb_atomic_int_impl_t;
#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
#define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add (&(AI), (V))
#define hb_atomic_ptr_impl_get(P) (void *) (__sync_synchronize (), *(P))
#define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
#include <atomic.h>
#include <mbarrier.h>
typedef unsigned int hb_atomic_int_impl_t;
#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
#define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
#define hb_atomic_ptr_impl_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
#define hb_atomic_ptr_impl_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
#elif !defined(HB_NO_MT) && defined(_AIX) && defined(__IBMCPP__)
#include <builtins.h>

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