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Linux 2.6 - man page for pthread_mutexattr_getprioceiling (linux section 3posix)

PTHREAD_MUTEXATTR_GETPRIOCEILING(P) POSIX Programmer's Manual PTHREAD_MUTEXATTR_GETPRIOCEILING(P)

NAME
       pthread_mutexattr_getprioceiling, pthread_mutexattr_setprioceiling - get and set the prio-
       ceiling attribute of the mutex attributes object (REALTIME THREADS)

SYNOPSIS
       #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);

DESCRIPTION
       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-
       attr_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.

RETURN VALUE
       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.

ERRORS
       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.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_cond_destroy() , pthread_create() , pthread_mutex_destroy() , the Base Definitions
       volume of IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT
       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)


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