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PTHREAD_MUTEX_INIT(3) Library Functions Manual PTHREAD_MUTEX_INIT(3)

pthread_mutex_init
create a mutex

#include <pthread.h>
int
pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr);

The pthread_mutex_init() function creates a new mutex, with attributes specified with attr. If attr is NULL the default attributes are used, otherwise attr should be initialized by calling pthread_mutexattr_init(3).
A mutex may also be initialized by assignment with the macro PTHREAD_MUTEX_INITIALIZER.

If successful, pthread_mutex_init() will return zero and put the new mutex ID into mutex, otherwise an error number will be returned to indicate the error.

pthread_mutex_init() will fail if:
 
 
[]
The value specified by attr is invalid.
 
 
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The process cannot allocate enough memory to create another mutex.

pthread_mutex_destroy(3), pthread_mutex_lock(3), pthread_mutex_unlock(3), pthread_mutexattr_init(3)

pthread_mutex_init() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
January 3, 2014 OpenBSD-current