PTHREAD_MUTEXATTR_GETPRIOCEILING(P) POSIX Programmer's Manual PTHREAD_MUTEXATTR_GETPRIOCEILING(P)
pthread_mutexattr_getprioceiling, pthread_mutexattr_setprioceiling - get and set the prio-
ceiling attribute of the mutex attributes object (REALTIME THREADS)
int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *
restrict attr, int *restrict prioceiling);
int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
The pthread_mutexattr_getprioceiling() and pthread_mutexattr_setprioceiling() functions,
respectively, shall get and set the priority ceiling attribute of a mutex attributes
object pointed to by attr which was previously created by the function pthread_mutex-
The prioceiling attribute contains the priority ceiling of initialized mutexes. The values
of prioceiling are within the maximum range of priorities defined by SCHED_FIFO.
The prioceiling attribute defines the priority ceiling of initialized mutexes, which is
the minimum priority level at which the critical section guarded by the mutex is executed.
In order to avoid priority inversion, the priority ceiling of the mutex shall be set to a
priority higher than or equal to the highest priority of all the threads that may lock
that mutex. The values of prioceiling are within the maximum range of priorities defined
under the SCHED_FIFO scheduling policy.
Upon successful completion, the pthread_mutexattr_getprioceiling() and pthread_mutex-
attr_setprioceiling() functions shall return zero; otherwise, an error number shall be
returned to indicate the error.
The pthread_mutexattr_getprioceiling() and pthread_mutexattr_setprioceiling() functions
may fail if:
EINVAL The value specified by attr or prioceiling is invalid.
EPERM 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_cond_destroy() , pthread_create() , pthread_mutex_destroy() , 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 PTHREAD_MUTEXATTR_GETPRIOCEILING(P)