PTHREAD_MUTEXATTR_INIT(3C) Standard C Library Functions

NAME

pthread_mutexattr_init, pthread_mutexattr_destroy - initialize or destroy
mutex attributes object

SYNOPSIS

cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>

int pthread_mutexattr_init(pthread_mutexattr_t *attr);


int pthread_mutexattr_destroy(pthread_mutexattr_t *attr);

DESCRIPTION

The pthread_mutexattr_init() function initializes a mutex attributes
object attr with the default value for all of the attributes defined by
the implementation.


The effect of initializing an already initialized mutex attributes
object is undefined.


After a mutex attributes object has been used to initialize one or more
mutexes, any function affecting the attributes object (including
destruction) does not affect any previously initialized mutexes.


The pthread_mutexattr_destroy() function destroys a mutex attributes
object; the object becomes, in effect, uninitialized. An implementation
may cause pthread_mutexattr_destroy() to set the object referenced by
attr to an invalid value. A destroyed mutex attributes object can be re-
initialized using pthread_mutexattr_init(); the results of otherwise
referencing the object after it has been destroyed are undefined.

RETURN VALUES

Upon successful completion, pthread_mutexattr_init() and
pthread_mutexattr_destroy() return 0. Otherwise, an error number is
returned to indicate the error.

ERRORS

The pthread_mutexattr_init() function may fail if:

ENOMEM
Insufficient memory exists to initialize the mutex attributes
object.


The pthread_mutexattr_destroy() function may fail if:

EINVAL
The value specified by attr is invalid.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO

pthread_cond_init(3C), pthread_create(3C), pthread_mutex_init(3C),
pthread_mutexattr_settype(3C), attributes(7), standards(7)

March 23, 2005 PTHREAD_MUTEXATTR_INIT(3C)