1PTHREAD_MUTEX_GETPRIOCEILINGP(OPS)IX Programmer's MaPnTuHaRlEAD_MUTEX_GETPRIOCEILING(P)
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NAME

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

10       #include <pthread.h>
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12       int pthread_mutex_getprioceiling(const pthread_mutex_t *restrict mutex,
13              int *restrict prioceiling);
14       int pthread_mutex_setprioceiling(pthread_mutex_t *restrict mutex,
15              int prioceiling, int *restrict old_ceiling);
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DESCRIPTION

19       The pthread_mutex_getprioceiling() function shall  return  the  current
20       priority ceiling of the mutex.
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22       The pthread_mutex_setprioceiling() function shall either lock the mutex
23       if it is unlocked, or block until it can successfully lock  the  mutex,
24       then  it  shall  change  the  mutex's  priority ceiling and release the
25       mutex. When the change is successful, the previous value of the  prior‐
26       ity  ceiling  shall  be returned in old_ceiling. The process of locking
27       the mutex need not adhere to the priority protect protocol.
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29       If the pthread_mutex_setprioceiling() function fails, the mutex  prior‐
30       ity ceiling shall not be changed.
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RETURN VALUE

33       If      successful,      the     pthread_mutex_getprioceiling()     and
34       pthread_mutex_setprioceiling() functions shall return zero;  otherwise,
35       an error number shall be returned to indicate the error.
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ERRORS

38       The  pthread_mutex_getprioceiling()  and pthread_mutex_setprioceiling()
39       functions may fail if:
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41       EINVAL The priority requested by prioceiling is out of range.
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43       EINVAL The value specified by mutex  does  not  refer  to  a  currently
44              existing mutex.
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46       EPERM  The caller does not have the privilege to perform the operation.
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49       These functions shall not return an error code of [EINTR].
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51       The following sections are informative.
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EXAMPLES

54       None.
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APPLICATION USAGE

57       None.
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RATIONALE

60       None.
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FUTURE DIRECTIONS

63       None.
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SEE ALSO

66       pthread_mutex_destroy()  ,  pthread_mutex_lock() , pthread_mutex_timed‐
67       lock()  ,  the  Base  Definitions   volume   of   IEEE Std 1003.1-2001,
68       <pthread.h>
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71       Portions  of  this text are reprinted and reproduced in electronic form
72       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
73       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
74       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
75       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
76       event of any discrepancy between this version and the original IEEE and
77       The  Open Group Standard, the original IEEE and The Open Group Standard
78       is the referee document. The original Standard can be  obtained  online
79       at http://www.opengroup.org/unix/online.html .
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83IEEE/The Open Group                  2003      PTHREAD_MUTEX_GETPRIOCEILING(P)
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