NAME

pthread_mutex_init — create a mutex

SYNOPSIS

#include <pthread.h>

int
pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr);

DESCRIPTION

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.

RETURN VALUES

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.

ERRORS

pthread_mutex_init() will fail if:

[EINVAL]

The value specified by attr is invalid.

[ENOMEM]

The process cannot allocate enough memory to create another mutex.

SEE ALSO

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

STANDARDS

pthread_mutex_init() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).