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| author | Rich Felker <dalias@aerifal.cx> | 2011-08-02 20:31:15 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-08-02 20:31:15 -0400 |
| commit | c68de0be2fb649f91b31080224fb6e48084eaaee (patch) | |
| tree | d9495283490f37833ca6e32f4b6876ca10ac06eb /src/thread/pthread_mutex_lock.c | |
| parent | 344ea148852ed02f280cb92f8fc1611529d60448 (diff) | |
| download | musl-c68de0be2fb649f91b31080224fb6e48084eaaee.tar.gz musl-c68de0be2fb649f91b31080224fb6e48084eaaee.tar.bz2 musl-c68de0be2fb649f91b31080224fb6e48084eaaee.tar.xz musl-c68de0be2fb649f91b31080224fb6e48084eaaee.zip | |
avoid accessing mutex memory after atomic unlock
this change is needed to fix a race condition and ensure that it's
possible to unlock and destroy or unmap the mutex as soon as
pthread_mutex_lock succeeds. POSIX explicitly gives such an example in
the rationale and requires an implementation to allow such usage.
Diffstat (limited to 'src/thread/pthread_mutex_lock.c')
| -rw-r--r-- | src/thread/pthread_mutex_lock.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/src/thread/pthread_mutex_lock.c b/src/thread/pthread_mutex_lock.c index 99c15bd8..2b4f3a73 100644 --- a/src/thread/pthread_mutex_lock.c +++ b/src/thread/pthread_mutex_lock.c @@ -2,17 +2,5 @@ int pthread_mutex_lock(pthread_mutex_t *m) { - int r; - - if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_swap(&m->_m_lock, EBUSY)) - return 0; - - 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) - return EDEADLK; - __wait(&m->_m_lock, &m->_m_waiters, r, 0); - } - return r; + return pthread_mutex_timedlock(m, 0); } |