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

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

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

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

       The pthread_mutex_setprioceiling() function shall either lock the mutex if it is unlocked,
       or block until it can successfully lock the mutex, then it shall change the mutex's prior-
       ity  ceiling  and  release the mutex. When the change is successful, the previous value of
       the priority ceiling shall be returned in old_ceiling. The process of  locking  the  mutex
       need not adhere to the priority protect protocol.

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

RETURN VALUE
       If successful, the pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling() func-
       tions  shall  return  zero;  otherwise,	an error number shall be returned to indicate the
       error.

ERRORS
       The pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling() functions	may  fail
       if:

       EINVAL The priority requested by prioceiling is out of range.

       EINVAL The value specified by mutex does not refer to a currently existing mutex.

       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_mutex_destroy() , pthread_mutex_lock() , pthread_mutex_timedlock() , the Base Def-
       initions 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_MUTEX_GETPRIOCEILING(P)


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