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| author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
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| committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
| commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
| tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/thread/pthread_mutex_trylock.c | |
| download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.xz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.zip | |
initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/thread/pthread_mutex_trylock.c')
| -rw-r--r-- | src/thread/pthread_mutex_trylock.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c new file mode 100644 index 00000000..1e3817bb --- /dev/null +++ b/src/thread/pthread_mutex_trylock.c @@ -0,0 +1,28 @@ +#include "pthread_impl.h" + +int pthread_mutex_trylock(pthread_mutex_t *m) +{ + if (m->__type == PTHREAD_MUTEX_RECURSIVE) { + pthread_t self = pthread_self(); + if (m->__owner == self) { + if ((unsigned)m->__lock >= INT_MAX) return EAGAIN; + a_inc(&m->__lock); + return 0; + } + if (a_fetch_add(&m->__lock, 1)) { + if (a_fetch_add(&m->__lock, -1)==1 && m->__waiters) + __wake(&m->__lock, 1, 0); + return EBUSY; + } + m->__owner = self; + return 0; + } + + if (a_xchg(&m->__lock, 1)) + if (m->__type == PTHREAD_MUTEX_ERRORCHECK + && m->__owner == pthread_self()) return EDEADLK; + else return EBUSY; + if (m->__type == PTHREAD_MUTEX_ERRORCHECK) + m->__owner = pthread_self(); + return 0; +} |