16 lines
362 B
C
16 lines
362 B
C
#include "pthread_impl.h"
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int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
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{
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int val, cnt;
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do {
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val = rw->_rw_lock;
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cnt = val & 0x7fffffff;
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if (cnt == 0x7fffffff) return EBUSY;
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if (cnt == 0x7ffffffe) return EAGAIN;
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} while (a_cas(&rw->_rw_lock, val, val+1) != val);
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return 0;
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}
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weak_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);
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