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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-08 03:41:05 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-08 03:41:05 -0500 |
| commit | 4820f9268d3dc1f2aac923de0a591ffd5d54ea89 (patch) | |
| tree | b0b247a81d43cb7a23a5eb0dc33ea1c83c9130d4 /src/thread/pthread_mutex_unlock.c | |
| parent | 1d6b1f15929ff19f4dce4f83947e14f7c3fc3c19 (diff) | |
| download | musl-4820f9268d3dc1f2aac923de0a591ffd5d54ea89.tar.gz musl-4820f9268d3dc1f2aac923de0a591ffd5d54ea89.tar.bz2 musl-4820f9268d3dc1f2aac923de0a591ffd5d54ea89.tar.xz musl-4820f9268d3dc1f2aac923de0a591ffd5d54ea89.zip | |
fix and optimize non-default-type mutex behavior
problem 1: mutex type from the attribute was being ignored by
pthread_mutex_init, so recursive/errorchecking mutexes were never
being used at all.
problem 2: ownership of recursive mutexes was not being enforced at
unlock time.
Diffstat (limited to 'src/thread/pthread_mutex_unlock.c')
| -rw-r--r-- | src/thread/pthread_mutex_unlock.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c index 0275eb52..39cea4b6 100644 --- a/src/thread/pthread_mutex_unlock.c +++ b/src/thread/pthread_mutex_unlock.c @@ -2,16 +2,13 @@ int pthread_mutex_unlock(pthread_mutex_t *m) { - if (m->_m_type == PTHREAD_MUTEX_RECURSIVE) { - if (a_fetch_add(&m->_m_lock, -1)==1 && m->_m_waiters) - __wake(&m->_m_lock, 1, 0); - return 0; + if (m->_m_type != PTHREAD_MUTEX_NORMAL) { + if (m->_m_owner != pthread_self()->tid) + return EPERM; + if (m->_m_type == PTHREAD_MUTEX_RECURSIVE && --m->_m_count) + return 0; } - if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK - && m->_m_owner != pthread_self()->tid) - return EPERM; - m->_m_owner = 0; m->_m_lock = 0; if (m->_m_waiters) __wake(&m->_m_lock, 1, 0); |