| #include "pthread_impl.h" |
| |
| int __pthread_mutex_trylock_owner(pthread_mutex_t* m) { |
| int old, own; |
| int type = m->_m_type & PTHREAD_MUTEX_MASK; |
| int tid = __thread_get_tid(); |
| |
| old = atomic_load(&m->_m_lock); |
| own = old & PTHREAD_MUTEX_OWNED_LOCK_MASK; |
| if (own == tid && (type & PTHREAD_MUTEX_MASK) == PTHREAD_MUTEX_RECURSIVE) { |
| if ((unsigned)m->_m_count >= INT_MAX) |
| return EAGAIN; |
| m->_m_count++; |
| return 0; |
| } |
| |
| if (own || a_cas_shim(&m->_m_lock, old, tid) != old) { |
| return EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| int pthread_mutex_trylock(pthread_mutex_t* m) { |
| if ((m->_m_type & PTHREAD_MUTEX_MASK) == PTHREAD_MUTEX_NORMAL) |
| return a_cas_shim(&m->_m_lock, 0, EBUSY) & EBUSY; |
| return __pthread_mutex_trylock_owner(m); |
| } |
