diff options
Diffstat (limited to 'src/thread/pthread_mutex_trylock.c')
| -rw-r--r-- | src/thread/pthread_mutex_trylock.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c index de57ff9e..f48aaade 100644 --- a/src/thread/pthread_mutex_trylock.c +++ b/src/thread/pthread_mutex_trylock.c @@ -3,19 +3,51 @@ int pthread_mutex_trylock(pthread_mutex_t *m) { int tid; + int own; + pthread_t self; if (m->_m_type == PTHREAD_MUTEX_NORMAL) return (m->_m_lock || a_swap(&m->_m_lock, 1)) ? EBUSY : 0; - tid = pthread_self()->tid; + self = pthread_self(); + tid = self->tid | 0x80000000; - if (m->_m_lock == tid && m->_m_type == PTHREAD_MUTEX_RECURSIVE) { + if (m->_m_type >= 4) { + if (!self->robust_list.off) + syscall2(__NR_set_robust_list, + (long)&self->robust_list, 3*sizeof(long)); + self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next; + self->robust_list.pending = &m->_m_next; + } + + if (m->_m_lock == tid && (m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE) { if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN; m->_m_count++; return 0; } - if (m->_m_lock || a_cas(&m->_m_lock, 0, tid)) return EBUSY; + own = m->_m_lock; + if ((own && !(own & 0x40000000)) || a_cas(&m->_m_lock, own, tid)!=own) + return EBUSY; + m->_m_count = 1; + + if (m->_m_type < 4) return 0; + + if (m->_m_type >= 8) { + m->_m_lock = 0; + return ENOTRECOVERABLE; + } + m->_m_next = self->robust_list.head; + m->_m_prev = &self->robust_list.head; + if (self->robust_list.head) + self->robust_list.head[-1] = &m->_m_next; + self->robust_list.head = &m->_m_next; + self->robust_list.pending = 0; + if (own) { + m->_m_type += 8; + return EOWNERDEAD; + } + return 0; } |