mirror of https://github.com/mkerrisk/man-pages
84 lines
2.8 KiB
Plaintext
84 lines
2.8 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "PTHREAD_ATTR_GETSCHEDPOLICY" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" pthread_attr_getschedpolicy
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.SH NAME
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pthread_attr_getschedpolicy, pthread_attr_setschedpolicy \- get and
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set the schedpolicy attribute (\fBREALTIME
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THREADS\fP)
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.SH SYNOPSIS
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.LP
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\fB#include <pthread.h>
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.br
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.sp
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int pthread_attr_getschedpolicy(const pthread_attr_t *restrict\fP
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\fIattr\fP\fB,
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.br
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\ \ \ \ \ \ int *restrict\fP \fIpolicy\fP\fB);
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.br
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int pthread_attr_setschedpolicy(pthread_attr_t *\fP\fIattr\fP\fB,
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int\fP \fIpolicy\fP\fB); \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIpthread_attr_getschedpolicy\fP() and \fIpthread_attr_setschedpolicy\fP()
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functions, respectively, shall get and set the
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\fIschedpolicy\fP attribute in the \fIattr\fP argument.
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.LP
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The supported values of \fIpolicy\fP shall include SCHED_FIFO, SCHED_RR,
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and SCHED_OTHER, which are defined in the \fI<sched.h>\fP header.
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When threads executing with the scheduling policy SCHED_FIFO,
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SCHED_RR, \ or SCHED_SPORADIC are waiting on a mutex, they
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shall acquire the mutex in priority order when the mutex is unlocked.
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.SH RETURN VALUE
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.LP
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If successful, the \fIpthread_attr_getschedpolicy\fP() and \fIpthread_attr_setschedpolicy\fP()
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functions shall return zero;
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otherwise, an error number shall be returned to indicate the error.
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.SH ERRORS
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.LP
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The \fIpthread_attr_setschedpolicy\fP() function may fail if:
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.TP 7
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.B EINVAL
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The value of \fIpolicy\fP is not valid.
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.TP 7
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.B ENOTSUP
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An attempt was made to set the attribute to an unsupported value.
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.sp
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.LP
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These functions shall not return an error code of [EINTR].
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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After these attributes have been set, a thread can be created with
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the specified attributes using \fIpthread_create\fP(). Using these
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routines does not affect the current running
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thread.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIpthread_attr_destroy\fP() , \fIpthread_attr_getscope\fP() , \fIpthread_attr_getinheritsched\fP()
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, \fIpthread_attr_getschedparam\fP() , \fIpthread_create\fP() , the
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Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<pthread.h>\fP,
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\fI<sched.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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