int pthread_mutex_getprioceiling(const pthread_mutex_t *restrict
int pthread_mutex_setprioceiling(pthread_mutex_t *restrictmutex,
intprioceiling, int *restrictold_ceiling);
The pthread_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.
If successful, the pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling()
functions shall return zero;
otherwise, an error number shall be returned to indicate the error.
The pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling()
functions may fail if:
The priority requested by prioceiling is out of range.
The value specified by mutex does not refer to a currently existing
The caller does not have the privilege to perform the operation.
These functions shall not return an error code of [EINTR].
The following sections are informative.
pthread_mutex_destroy() , pthread_mutex_lock() , pthread_mutex_timedlock()
, the Base Definitions volume of
IEEE Std 1003.1-2001, <pthread.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at