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pthread_mutex_getprioceiling(3p) — Linux manual page

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 *restrictmutex,           int *restrictprioceiling);       int pthread_mutex_setprioceiling(pthread_mutex_t *restrictmutex,           intprioceiling, int *restrictold_ceiling);

DESCRIPTION        top

       Thepthread_mutex_getprioceiling() function shall return the       current priority ceiling of the mutex.       Thepthread_mutex_setprioceiling() function shall attempt to lock       the mutex as if by a call topthread_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 topthread_mutex_unlock().  When the change is successful,       the previous value of the priority ceiling shall be returned inold_ceiling.       If thepthread_mutex_setprioceiling() function fails, the mutex       priority ceiling shall not be changed.

RETURN VALUE        top

       If successful, thepthread_mutex_getprioceiling() andpthread_mutex_setprioceiling() functions shall return zero;       otherwise, an error number shall be returned to indicate the       error.

ERRORS        top

       These functions shall fail if:EINVALThe protocol attribute ofmutex is PTHREAD_PRIO_NONE.EPERMThe implementation requires appropriate privileges to              perform the operation and the caller does not have              appropriate privileges.       Thepthread_mutex_setprioceiling() function shall fail if:EAGAINThe mutex could not be acquired because the maximum number              of recursive locks formutex has been exceeded.EDEADLK              The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current              thread already owns the mutex.EINVALThe 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 (seepthread_mutex_lock(3p)).       Thepthread_mutex_setprioceiling() function may fail if:EDEADLK              A deadlock condition was detected.EINVALThe priority requested byprioceiling 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 (seepthread_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 athttp://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, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017PTHREAD_...OCEILING(3P)

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

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