- while ((r=pthread_mutex_trylock(m)) == EBUSY) {
- if (!(r=m->_m_lock) || (r&0x40000000)) continue;
- if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK
- && (r&0x1fffffff) == pthread_self()->tid)
+ int type = m->_m_type;
+ int r, t, priv = (type & 128) ^ 128;
+
+ r = pthread_mutex_trylock(m);
+ if (r != EBUSY) return r;
+
+ int spins = 100;
+ while (spins-- && m->_m_lock && !m->_m_waiters) a_spin();
+
+ while ((r=__pthread_mutex_trylock(m)) == EBUSY) {
+ if (!(r=m->_m_lock) || ((r&0x40000000) && (type&4)))
+ continue;
+ if ((type&3) == PTHREAD_MUTEX_ERRORCHECK
+ && (r&0x7fffffff) == __pthread_self()->tid)