pthread_mutex_getprioceiling(3p) — Linux manual page

PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

PTHREAD_...OCEILING(3P) POSIX Programmer's ManualPTHREAD_...OCEILING(3P)

PROLOG         top

       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.

NAME         top

       pthread_mutex_getprioceiling, pthread_mutex_setprioceiling — get
       and set the priority ceiling of a mutex (REALTIME THREADS)

SYNOPSIS         top

       #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         top

       The pthread_mutex_getprioceiling() function shall return the
       current priority ceiling of the mutex.

       The pthread_mutex_setprioceiling() function shall attempt to lock
       the mutex as if by a call to pthread_mutex_lock(), except that
       the process of locking the mutex need not adhere to the priority
       protect protocol. On acquiring the mutex it shall change the
       mutex's priority ceiling and then release the mutex as if by a
       call to pthread_mutex_unlock().  When the change is successful,
       the previous value of the priority ceiling shall be returned in
       old_ceiling.

       If the pthread_mutex_setprioceiling() function fails, the mutex
       priority ceiling shall not be changed.

RETURN VALUE         top

       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.

ERRORS         top

       These functions shall fail if:

       EINVAL The protocol attribute of mutex is PTHREAD_PRIO_NONE.

       EPERM  The implementation requires appropriate privileges to
              perform the operation and the caller does not have
              appropriate privileges.

       The pthread_mutex_setprioceiling() function shall fail if:

       EAGAIN The mutex could not be acquired because the maximum number
              of recursive locks for mutex has been exceeded.

       EDEADLK
              The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current
              thread already owns the mutex.

       EINVAL The mutex was created with the protocol attribute having
              the value PTHREAD_PRIO_PROTECT and the calling thread's
              priority is higher than the mutex's current priority
              ceiling, and the implementation adheres to the priority
              protect protocol in the process of locking the mutex.

       ENOTRECOVERABLE
              The mutex is a robust mutex and the state protected by the
              mutex is not recoverable.

       EOWNERDEAD
              The mutex is a robust mutex and the process containing the
              previous owning thread terminated while holding the mutex
              lock. The mutex lock shall be acquired by the calling
              thread and it is up to the new owner to make the state
              consistent (see pthread_mutex_lock(3p)).

       The pthread_mutex_setprioceiling() function may fail if:

       EDEADLK
              A deadlock condition was detected.

       EINVAL The priority requested by prioceiling is out of range.

       EOWNERDEAD
              The mutex is a robust mutex and the previous owning thread
              terminated while holding the mutex lock. The mutex lock
              shall be acquired by the calling thread and it is up to
              the new owner to make the state consistent (see
              pthread_mutex_lock(3p)).

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       pthread_mutex_destroy(3p), pthread_mutex_lock(3p),
       pthread_mutex_timedlock(3p)

       The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 http://www.opengroup.org/unix/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               2017           PTHREAD_...OCEILING(3P)

Pages that refer to this page: pthread.h(0p)pthread_mutex_destroy(3p)pthread_mutex_setprioceiling(3p)