Rich Felker
afbcac6826
use CAS instead of swap since it's lighter for most archs, and keep EBUSY in the lock value so that the old value obtained by CAS can be used directly as the return value for pthread_spin_trylock.
8 lines
126 B
C
8 lines
126 B
C
#include "pthread_impl.h"
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#include <errno.h>
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int pthread_spin_trylock(pthread_spinlock_t *s)
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{
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return a_cas(s, 0, EBUSY);
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}
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