Minor refactoring to the atomics implementation
s/atomic_int/atomic_int_impl/ and s/atomic_ptr/atomic_ptr_impl/ to bring it in par with hb_mutex_impl_t, then re-introduce hb_atomic_int_t as a wrapper around hb_atomic_int_impl_t. In hb_reference_count_t, make it clear the non-atomic get and set are intentional due to nature of the cases they are used in (comparison to -1 and the debug output/tracing).
This commit is contained in:
Konstantin Ritt
Behdad Esfahbod
parent
24930d544e
commit
3f174cd020
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@ -39,11 +39,11 @@
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/* We need external help for these */
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#if defined(hb_atomic_int_add) \
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&& defined(hb_atomic_ptr_get) \
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&& defined(hb_atomic_ptr_cmpexch)
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#if defined(hb_atomic_int_impl_add) \
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&& defined(hb_atomic_ptr_impl_get) \
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&& defined(hb_atomic_ptr_impl_cmpexch)
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/* Defined externally, i.e. in config.h */
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/* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
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#elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
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@ -62,11 +62,11 @@ static inline void _HBMemoryBarrier (void) {
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#endif
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}
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typedef LONG hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
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typedef LONG hb_atomic_int_impl_t;
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#define hb_atomic_int_impl_add(AI, V) InterlockedExchangeAdd (&(AI), (V))
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#define hb_atomic_ptr_get(P) (_HBMemoryBarrier (), (void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
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#define hb_atomic_ptr_impl_get(P) (_HBMemoryBarrier (), (void *) *(P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (InterlockedCompareExchangePointer ((void **) (P), (void *) (N), (void *) (O)) == (void *) (O))
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#elif !defined(HB_NO_MT) && defined(__APPLE__)
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@ -78,28 +78,31 @@ typedef LONG hb_atomic_int_t;
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#include <Availability.h>
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#endif
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typedef int32_t hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
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#define hb_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
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typedef int32_t hb_atomic_int_impl_t;
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#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
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#define hb_atomic_int_impl_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
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#define hb_atomic_ptr_impl_get(P) (OSMemoryBarrier (), (void *) *(P))
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#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
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#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
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#else
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#if __ppc64__ || __x86_64__ || __aarch64__
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#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
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#else
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#define hb_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
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#endif
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#endif
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#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
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typedef int hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) __sync_fetch_and_add (&(AI), (V))
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typedef int hb_atomic_int_impl_t;
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#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
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#define hb_atomic_int_impl_add(AI, V) __sync_fetch_and_add (&(AI), (V))
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#define hb_atomic_ptr_get(P) (void *) (__sync_synchronize (), *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
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#define hb_atomic_ptr_impl_get(P) (void *) (__sync_synchronize (), *(P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) __sync_bool_compare_and_swap ((P), (O), (N))
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#elif !defined(HB_NO_MT) && defined(HAVE_SOLARIS_ATOMIC_OPS)
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@ -107,33 +110,54 @@ typedef int hb_atomic_int_t;
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#include <atomic.h>
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#include <mbarrier.h>
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typedef unsigned int hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
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typedef unsigned int hb_atomic_int_impl_t;
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#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
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#define hb_atomic_int_impl_add(AI, V) ( ({__machine_rw_barrier ();}), atomic_add_int_nv (&(AI), (V)) - (V))
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#define hb_atomic_ptr_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) ( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
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#define hb_atomic_ptr_impl_get(P) ( ({__machine_rw_barrier ();}), (void *) *(P))
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#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)
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#elif !defined(HB_NO_MT)
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#define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */
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typedef volatile int hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
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#define hb_atomic_ptr_get(P) ((void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
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typedef volatile int hb_atomic_int_impl_t;
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#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
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#define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
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#define hb_atomic_ptr_impl_get(P) ((void *) *(P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void * volatile *) (P) == (void *) (O) ? (* (void * volatile *) (P) = (void *) (N), true) : false)
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#else /* HB_NO_MT */
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typedef int hb_atomic_int_t;
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#define hb_atomic_int_add(AI, V) (((AI) += (V)) - (V))
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typedef int hb_atomic_int_impl_t;
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#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
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#define hb_atomic_int_impl_add(AI, V) (((AI) += (V)) - (V))
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#define hb_atomic_ptr_impl_get(P) ((void *) *(P))
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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#define hb_atomic_ptr_get(P) ((void *) *(P))
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#define hb_atomic_ptr_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
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#endif
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/* TODO Add tracing. */
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#define HB_ATOMIC_INT_INIT(V) {HB_ATOMIC_INT_IMPL_INIT(V)}
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struct hb_atomic_int_t
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{
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hb_atomic_int_impl_t ref;
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inline void set_unsafe (int v) { ref = v; }
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inline int get_unsafe (void) const { return ref; }
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inline int inc (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (ref), 1); }
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inline int dec (void) { return hb_atomic_int_impl_add (const_cast<hb_atomic_int_impl_t &> (ref), -1); }
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};
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#define hb_atomic_ptr_get(P) hb_atomic_ptr_impl_get(P)
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#define hb_atomic_ptr_cmpexch(P,O,N) hb_atomic_ptr_impl_cmpexch((P),(O),(N))
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#endif /* HB_ATOMIC_PRIVATE_HH */
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@ -45,7 +45,7 @@
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&& defined(hb_mutex_impl_unlock) \
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&& defined(hb_mutex_impl_finish)
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/* Defined externally, i.e. in config.h */
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/* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */
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#elif !defined(HB_NO_MT) && (defined(_WIN32) || defined(__CYGWIN__))
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@ -119,10 +119,12 @@ typedef int hb_mutex_impl_t;
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#define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
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#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
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#endif
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#define HB_MUTEX_INIT {HB_MUTEX_IMPL_INIT}
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struct hb_mutex_t
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{
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/* TODO Add tracing. */
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@ -47,19 +47,20 @@
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/* reference_count */
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#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
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#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
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#define HB_REFERENCE_COUNT_INVALID_VALUE -1
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#define HB_REFERENCE_COUNT_INIT {HB_ATOMIC_INT_INIT(HB_REFERENCE_COUNT_INVALID_VALUE)}
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struct hb_reference_count_t
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{
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hb_atomic_int_t ref_count;
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inline void init (int v) { ref_count = v; }
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inline int inc (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count), 1); }
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inline int dec (void) { return hb_atomic_int_add (const_cast<hb_atomic_int_t &> (ref_count), -1); }
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inline void finish (void) { ref_count = HB_REFERENCE_COUNT_INVALID_VALUE; }
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inline bool is_invalid (void) const { return ref_count == HB_REFERENCE_COUNT_INVALID_VALUE; }
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inline void init (int v) { ref_count.set_unsafe (v); }
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inline int get_unsafe (void) const { return ref_count.get_unsafe (); }
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inline int inc (void) { return ref_count.inc (); }
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inline int dec (void) { return ref_count.dec (); }
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inline void finish (void) { ref_count.set_unsafe (HB_REFERENCE_COUNT_INVALID_VALUE); }
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inline bool is_invalid (void) const { return ref_count.get_unsafe () == HB_REFERENCE_COUNT_INVALID_VALUE; }
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};
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@ -102,7 +103,7 @@ struct hb_object_header_t
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hb_reference_count_t ref_count;
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hb_user_data_array_t user_data;
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#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INVALID, HB_USER_DATA_ARRAY_INIT}
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#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, HB_USER_DATA_ARRAY_INIT}
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private:
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ASSERT_POD ();
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@ -117,7 +118,7 @@ static inline void hb_object_trace (const Type *obj, const char *function)
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DEBUG_MSG (OBJECT, (void *) obj,
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"%s refcount=%d",
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function,
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obj ? obj->header.ref_count.ref_count : 0);
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obj ? obj->header.ref_count.get_unsafe () : 0);
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}
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template <typename Type>
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