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PTHREAD_MUTEXATTR_GETPRIOCEILING(3P)rammer'sEManualEXATTR_GETPRIOCEILING(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
pthread_mutexattr_getprioceiling, pthread_mutexattr_setprioceiling —
get and set the prioceiling attribute of the mutex attributes object
(REALTIME THREADS)
#include <pthread.h>
int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t
*restrict attr, int *restrict prioceiling);
int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
int prioceiling);
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_mutexattr_init().
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.
The behavior is undefined if the value specified by the attr argument
to pthread_mutexattr_getprioceiling() or
pthread_mutexattr_setprioceiling() does not refer to an initialized
mutex attributes object.
Upon successful completion, the pthread_mutexattr_getprioceiling()
and pthread_mutexattr_setprioceiling() functions shall return zero;
otherwise, an error number shall be returned to indicate the error.
These functions may fail if:
EINVAL The value specified by 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.
None.
None.
If an implementation detects that the value specified by the attr
argument to pthread_mutexattr_getprioceiling() or
pthread_mutexattr_setprioceiling() does not refer to an initialized
mutex attributes object, it is recommended that the function should
fail and report an [EINVAL] error.
None.
pthread_cond_destroy(3p), pthread_create(3p),
pthread_mutex_destroy(3p)
The Base Definitions volume of POSIX.1‐2008, pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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 http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013PTHREAD_MUTEXATTR_GETPRIOCEILING(3P)
Pages that refer to this page: pthread.h(0p), pthread_mutexattr_setprioceiling(3p)
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