12 lines
446 B
Markdown
12 lines
446 B
Markdown
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# Once
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This is a simple abstraction for a once which will choose from a few
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different back-ends:
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* If C11 threads are available, use `call_once()`.
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* On Windows, use
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[InitOnceExecuteOnce()](https://msdn.microsoft.com/en-us/library/windows/desktop/ms683493(v=vs.85).aspx)
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* If `PTHREAD_ONCE_INIT` is defined (*i.e.*, if `<pthread.h>` has
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been included prior to including `once.h`), use `pthread_once()`.
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* Use `[atomic.h](../atomic)`.
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