cc –mt [ flag... ] file... [ library... ] #include <pthread.h> int pthread_mutexattr_init(pthread_mutexattr_t *attr);
int pthread_mutexattr_destroy(pthread_mutexattr_t *attr);
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.
Upon successful completion, pthread_mutexattr_init() and pthread_mutexattr_destroy() return 0. Otherwise, an error number is returned to indicate the error.
The pthread_mutexattr_init() function may fail if:
Insufficient memory exists to initialize the mutex attributes object.
The pthread_mutexattr_destroy() function may fail if:
The value specified by attr is invalid.
See attributes(5) for descriptions of the following attributes: