pthread_mutex

Name

pthread_mutex_unlock
- unlock a mutex

Library

libc_r.lib libpthread.lib libthr.lib

Synopsis

#include <pthread.h>

int pthread_mutex_unlock (pthread_mutex_t *mutex);

Return values

If successful, pthread_mutex_unlock will return zero, otherwise an error number will be returned to indicate the error.

Detailed description

If the current thread holds the lock on mutex, then the pthread_mutex_unlock function unlocks mutex.

Examples

static pthread_mutex_t    mutex = PTHREAD_MUTEX_INITIALIZER;
int XYZ()
{
   int  rc;
 /* Get the mutex using pthread_mutex_lock() */
 if((rc=pthread_mutex_lock(&mutex)) != 0) {
  fprintf(stderr,"Error at pthread_mutex_lock(), rc=%d\n",rc);
  return -1;
 }
 /* Release the mutex using pthread_mutex_unlock() */
 if((rc=pthread_mutex_unlock(&mutex)) != 0) {
  printf("unlock failed \n");
  return -1;
 }

Errors

The pthread_mutex_unlock function will fail if:

[`EINVAL`]
	The value specified by mutex is invalid.
[`ENOSYS`]
	If locking is not supported for this mutex kind.

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