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CAS should return a bool.

This commit is contained in:
Ben Vanik 2014-08-06 15:48:31 -07:00
parent b02ce5e95e
commit 4ce81fcda8
1 changed files with 32 additions and 11 deletions
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43
src/poly/atomic.h
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@ -40,11 +40,16 @@ inline int64_t atomic_exchange(int64_t new_value, volatile int64_t* value) {
return OSAtomicCompareAndSwap64Barrier(*value, new_value, value); return OSAtomicCompareAndSwap64Barrier(*value, new_value, value);
} }
inline int32_t atomic_cas(int32_t old_value, int32_t new_value, inline bool atomic_cas(int32_t old_value, int32_t new_value,
volatile int32_t* value) { volatile int32_t* value) {
return OSAtomicCompareAndSwap32Barrier( return OSAtomicCompareAndSwap32Barrier(
old_value, new_value, reinterpret_cast<volatile int32_t*>(value)); old_value, new_value, reinterpret_cast<volatile int32_t*>(value));
} }
inline bool atomic_cas(int64_t old_value, int64_t new_value,
volatile int32_t* value) {
return OSAtomicCompareAndSwap64Barrier(
old_value, new_value, reinterpret_cast<volatile int64_t*>(value));
}
#elif XE_LIKE_WIN32 #elif XE_LIKE_WIN32
@ -64,11 +69,16 @@ inline int64_t atomic_exchange(int64_t new_value, volatile int64_t* value) {
new_value); new_value);
} }
inline int32_t atomic_cas(int32_t old_value, int32_t new_value, inline bool atomic_cas(int32_t old_value, int32_t new_value,
volatile int32_t* value) { volatile int32_t* value) {
return InterlockedCompareExchange(reinterpret_cast<volatile LONG*>(value), return InterlockedCompareExchange(reinterpret_cast<volatile LONG*>(value),
new_value, old_value) == old_value; new_value, old_value) == old_value;
} }
inline bool atomic_cas(int64_t old_value, int64_t new_value,
volatile int64_t* value) {
return InterlockedCompareExchange64(reinterpret_cast<volatile LONG64*>(value),
new_value, old_value) == old_value;
}
#elif XE_LIKE_POSIX #elif XE_LIKE_POSIX
@ -86,11 +96,16 @@ inline int64_t atomic_exchange(int64_t new_value, volatile int64_t* value) {
return __sync_val_compare_and_swap(*value, value, new_value); return __sync_val_compare_and_swap(*value, value, new_value);
} }
inline int32_t atomic_cas(int32_t old_value, int32_t new_value, inline bool atomic_cas(int32_t old_value, int32_t new_value,
volatile int32_t* value) { volatile int32_t* value) {
return __sync_bool_compare_and_swap( return __sync_bool_compare_and_swap(
reinterpret_cast<volatile int32_t*>(value), old_value, new_value); reinterpret_cast<volatile int32_t*>(value), old_value, new_value);
} }
inline bool atomic_cas(int64_t old_value, int64_t new_value,
volatile int64_t* value) {
return __sync_bool_compare_and_swap(
reinterpret_cast<volatile int64_t*>(value), old_value, new_value);
}
#else #else
@ -118,11 +133,17 @@ inline uint64_t atomic_exchange(uint64_t new_value, volatile uint64_t* value) {
reinterpret_cast<volatile int64_t*>(value))); reinterpret_cast<volatile int64_t*>(value)));
} }
inline uint32_t atomic_cas(uint32_t old_value, uint32_t new_value, inline bool atomic_cas(uint32_t old_value, uint32_t new_value,
volatile uint32_t* value) { volatile uint32_t* value) {
return static_cast<uint32_t>(atomic_cas( return atomic_cas(static_cast<int32_t>(old_value),
static_cast<int32_t>(old_value), static_cast<int32_t>(new_value), static_cast<int32_t>(new_value),
reinterpret_cast<volatile int32_t*>(value))); reinterpret_cast<volatile int32_t*>(value));
}
inline bool atomic_cas(uint64_t old_value, uint64_t new_value,
volatile uint64_t* value) {
return atomic_cas(static_cast<int64_t>(old_value),
static_cast<int64_t>(new_value),
reinterpret_cast<volatile int64_t*>(value));
} }
} // namespace poly } // namespace poly