C++ (Cpp) emscripten_atomic_cas_u32示例

示例#1

文件： test_pthread_gcc_64bit_atomic_op_and_fetch.cpp 项目： WizardOfArc/emscripten

// TEMP to make this test pass:
// Our Clang backend doesn't define this builtin function, so implement it ourselves.
// The current Atomics spec doesn't have the nand atomic op either, so must use a cas loop.
// TODO: Move this to Clang backend?
T __sync_nand_and_fetch(T *ptr, T x)
{
	for(;;)
	{
		T old = emscripten_atomic_load_u32(ptr);
		T newVal = ~(old & x);
		T old2 = emscripten_atomic_cas_u32(ptr, old, newVal);
		if (old2 == old) return old;
	}
}

示例#2

Bool atomic_bool_cas_u32(T *ptr, T oldVal, T newVal)
{
	T old = emscripten_atomic_cas_u32(ptr, oldVal, newVal);
	return old == oldVal;
}