1PTHREAD_MUTEXATTR_GETPRIOCEIPLOISNIGX(3PPr)ogrammerP'TsHRMEaAnDu_aMlUTEXATTR_GETPRIOCEILING(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       pthread_mutexattr_getprioceiling,  pthread_mutexattr_setprioceiling   -
13       get  and  set  the prioceiling attribute of the mutex attributes object
14       (REALTIME THREADS)
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SYNOPSIS

17       #include <pthread.h>
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19       int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *
20              restrict attr, int *restrict prioceiling);
21       int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
22              int prioceiling);
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DESCRIPTION

26       The pthread_mutexattr_getprioceiling()  and  pthread_mutexattr_setprio‐
27       ceiling() functions, respectively, shall get and set the priority ceil‐
28       ing attribute of a mutex attributes object pointed to by attr which was
29       previously created by the function pthread_mutexattr_init().
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31       The  prioceiling attribute contains the priority ceiling of initialized
32       mutexes. The values of prioceiling are within the maximum range of pri‐
33       orities defined by SCHED_FIFO.
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35       The  prioceiling  attribute defines the priority ceiling of initialized
36       mutexes, which is the minimum priority level at which the critical sec‐
37       tion  guarded  by  the  mutex  is  executed. In order to avoid priority
38       inversion, the priority ceiling of the mutex shall be set to a priority
39       higher  than  or  equal to the highest priority of all the threads that
40       may lock that mutex. The values of prioceiling are within  the  maximum
41       range of priorities defined under the SCHED_FIFO scheduling policy.
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RETURN VALUE

44       Upon  successful completion, the pthread_mutexattr_getprioceiling() and
45       pthread_mutexattr_setprioceiling() functions shall return zero;  other‐
46       wise, an error number shall be returned to indicate the error.
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ERRORS

49       The  pthread_mutexattr_getprioceiling()  and pthread_mutexattr_setprio‐
50       ceiling() functions may fail if:
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52       EINVAL The value specified by attr or prioceiling is invalid.
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54       EPERM  The caller does not have the privilege to perform the operation.
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57       These functions shall not return an error code of [EINTR].
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59       The following sections are informative.
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EXAMPLES

62       None.
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APPLICATION USAGE

65       None.
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RATIONALE

68       None.
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FUTURE DIRECTIONS

71       None.
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SEE ALSO

74       pthread_cond_destroy(), pthread_create(), pthread_mutex_destroy(),  the
75       Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
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78       Portions  of  this text are reprinted and reproduced in electronic form
79       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
80       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
81       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
82       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
83       event of any discrepancy between this version and the original IEEE and
84       The  Open Group Standard, the original IEEE and The Open Group Standard
85       is the referee document. The original Standard can be  obtained  online
86       at http://www.opengroup.org/unix/online.html .
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90IEEE/The Open Group                  2003 PTHREAD_MUTEXATTR_GETPRIOCEILING(3P)
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