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dca36ebaf8
Fortunately, the gcc port implements the builtins and, from basic testing, they seem to work. This is only really useful on Wii U--other platforms have more robust atomic operations, or aren't using gcc to build.
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* devkitPPC is missing a few functions that are kinda needed for some cores.
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* This should add them back in.
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*/
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#include <wiiu/os/atomic.h>
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/**
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* Performs an atomic swap of a single piece of data. In each function,
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* value is written to ptr, and the previous value is returned.
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*
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* From GCC docs:
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*
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* "This builtin is not a full barrier, but rather a *release* barrier. This
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* means that references after the builtin cannot move to (or be speculated
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* to) before the builtin, but previous memory stores may not be globally
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* visible yet, and previous memory loads may not yet be satisfied."
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*
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* https://gcc.gnu.org/onlinedocs/gcc-4.5.0/gcc/Atomic-Builtins.html
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*
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* This builtin seems to be implemented in the Wii U GCC toolchain. But since
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* this is GCC-specific, I'm not going to put it into a more general-use
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* location.
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*/
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uint8_t SwapAtomic8(uint8_t *ptr, uint8_t value)
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{
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return __sync_lock_test_and_set(ptr, value);
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}
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uint16_t SwapAtomic16(uint16_t *ptr, uint16_t value)
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{
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return __sync_lock_test_and_set(ptr, value);
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}
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uint32_t SwapAtomic32(uint32_t *ptr, uint32_t value)
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{
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return __sync_lock_test_and_set(ptr, value);
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}
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