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Unlock mutex
#include <pthread.h>
int pthread_mutex_unlock( pthread_mutex_t* mutex );
- mutex
- A pointer to the pthread_mutex_t object that you want to
unlock.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The pthread_mutex_unlock() function unlocks the mutex
mutex. The mutex should be owned by the calling thread. If
there are threads blocked on the mutex then the highest priority waiting
thread is unblocked and becomes the next owner of the mutex.
If the thread's priority was raised when a higher-priority thread
attempted to lock the mutex, the calling thread returns to its real priority
when it unlocks the mutex.
For more information, see
“Mutexes: mutual exclusion locks”
in the QNX Neutrino Microkernel chapter of the
System Architecture guide.
If mutex has been locked more than once, it must be
unlocked the same number of times before the next thread is given
ownership of the mutex. This only works for recursive mutexes.
- EOK
- Success.
- EINVAL
- Invalid mutex mutex.
- EPERM
- Current thread doesn't own mutex.
POSIX 1003.1 THR
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
pthread_mutex_lock(),
pthread_mutex_timedlock(),
pthread_mutex_trylock(),
SyncMutexUnlock()
“Mutexes: mutual exclusion locks”
in the QNX Neutrino Microkernel chapter of the
System Architecture guide
Processes and Threads
chapter of Getting Started with QNX Neutrino
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