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Cameron Gutman
509a36db16
__sync_lock_test_and_set() is designed for creating locks, not as a general atomic exchange function. As a result, it only provides an acquire memory barrier and isn't guaranteed to actually store the provided value (though it does on architectures we care about). __atomic_exchange_n() is supported on GCC/Clang for the last ~10 years, so let's use that instead if available. We will keep the __sync_lock_test_and_set() fallback around for ancient platforms, but add a full memory barrier to match the documented behavior.
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)