Initialises and destroys mutex attributes.
Threads Library (libpthreads.a)
#include <pthread.h> int pthread_mutexattr_init (pthread_mutexattr_t *attr); int pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
The function pthread_mutexattr_init initialises a mutex attributes object attr with the default value for all of the attributes defined by the implementation.
The effect of initialising an already initialised mutex attributes object is undefined.
After a mutex attributes object has been used to initialise one or more mutexes, any function affecting the attributes object (including destruction) does not affect any previously initialised mutexes.
The pthread_mutexattr_destroy function destroys a mutex attributes object; the object becomes, in effect, uninitialised. 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-initialised using pthread_mutexattr_init; the results of otherwise referencing the object after it has been destroyed are undefined.
| attr | Specifies the mutex attributes object to delete. |
Upon successful completion, pthread_mutexattr_init and pthread_mutexattr_destroy return zero. Otherwise, an error number is returned to indicate the error.
The pthread_mutexattr_init function will fail if:
| ENOMEM | Insufficient memory exists to initialise the mutex attributes object. |
The pthread_mutexattr_destroy function will fail if:
| EINVAL | The value specified by attr is invalid.
These functions will not return EINTR. |
This subroutine is part of the Base Operating System (BOS) Runtime.
The pthread_create subroutine, pthread_mutex_init or pthread_mutex_destroy subroutine, pthread_cond_destroy or pthread_cond_init subroutine, pthread.h file.
Using Mutexes in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.
Threads Library Options and Threads Library Quick Reference in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.