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.
9 lines
166 B
C
9 lines
166 B
C
#include "pthread_impl.h"
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#include <errno.h>
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int pthread_spin_lock(pthread_spinlock_t *s)
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{
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while (*(volatile int *)s || a_cas(s, 0, EBUSY)) a_spin();
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return 0;
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}
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