NAME
pthread_mutex_getprioceiling,
pthread_mutex_setprioceiling —
get or set the priority ceiling of a
mutex
LIBRARY
library “libpthread”
SYNOPSIS
#include
<pthread.h>
int
pthread_mutex_getprioceiling(const
pthread_mutex_t * restrict mutex,
int * restrict
prioceiling);
int
pthread_mutex_setprioceiling(pthread_mutex_t
* restrict mutex, int
prioceiling, int *
restrict old_ceiling);
DESCRIPTION
Thepthread_mutex_getprioceiling()
function shall return the current priority ceiling of the mutex.
The
pthread_mutex_setprioceiling()
function shall either lock the mutex if it is unlocked, or block until it
can successfully lock the mutex, then it shall change the mutex's priority
ceiling and release the mutex. When the change is successful, the previous
value of the priority ceiling shall be returned in
old_ceiling. The process of locking the mutex need not
adhere to the priority protect protocol. If the
pthread_mutex_setprioceiling() function fails, the
mutex priority ceiling shall not be changed.
RETURN VALUES
If successful, these functions return 0. Otherwise, an error number is returned to indicate the error.
ERRORS
The pthread_mutex_getprioceiling() and
pthread_mutex_setprioceiling() functions will fail
if:
- [
EINVAL] - The priority requested by prioceiling is out of range; or the value specified by mutex does not refer to a currently existing mutex.
- [
EPERM] - The caller does not have the privilege to perform the operation.
SEE ALSO
pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_timedlock(3), pthread_mutex_trylock(3), pthread_mutex_unlock(3)