22 lines
483 B
C
22 lines
483 B
C
#include "pthread_impl.h"
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int pthread_mutex_trylock(pthread_mutex_t *m)
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{
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int tid;
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if (m->_m_type == PTHREAD_MUTEX_NORMAL)
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return (m->_m_lock || a_swap(&m->_m_lock, 1)) ? EBUSY : 0;
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tid = pthread_self()->tid;
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if (m->_m_owner == tid && m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
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if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
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m->_m_count++;
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return 0;
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}
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if (m->_m_owner || a_xchg(&m->_m_lock, 1)) return EBUSY;
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m->_m_owner = tid;
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m->_m_count = 1;
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return 0;
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}
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