Atomically get value on Mac OS

I need some function to atomi开发者_如何学运维cally get int value. Something called OSAtomicGet(). Analog of g_atomic_int_get().

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Dereferencing an int from a known pointer is always atomic on architectures running Mac/iStuffs. Use OSMemoryBarrier() if you need a memory barrier.

int OSAtomicGet(volatile int* value) {
   OSMemoryBarrier();
   return *value;
}