mirror of https://github.com/mkerrisk/man-pages
93 lines
3.3 KiB
Plaintext
93 lines
3.3 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "PTHREAD_ATTR_GETSCHEDPARAM" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" pthread_attr_getschedparam
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.SH NAME
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pthread_attr_getschedparam, pthread_attr_setschedparam \- get and set
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the schedparam attribute
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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_getschedparam(const pthread_attr_t *restrict\fP \fIattr\fP\fB,
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.br
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\ \ \ \ \ \ struct sched_param *restrict\fP \fIparam\fP\fB);
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.br
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int pthread_attr_setschedparam(pthread_attr_t *restrict\fP \fIattr\fP\fB,
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.br
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\ \ \ \ \ \ const struct sched_param *restrict\fP \fIparam\fP\fB);
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\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_getschedparam\fP(), and \fIpthread_attr_setschedparam\fP()
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functions, respectively, shall get and set the
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scheduling parameter attributes in the \fIattr\fP argument. The contents
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of the \fIparam\fP structure are defined in the \fI<sched.h>\fP header.
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For the SCHED_FIFO and SCHED_RR policies, the only required member
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of
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\fIparam\fP is \fIsched_priority\fP.
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.LP
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For the SCHED_SPORADIC policy, the required members of the \fIparam\fP
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structure are \fIsched_priority\fP,
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\fIsched_ss_low_priority\fP, \fIsched_ss_repl_period\fP, \fIsched_ss_init_budget\fP,
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and \fIsched_ss_max_repl\fP. The specified
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\fIsched_ss_repl_period\fP must be greater than or equal to the specified
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\fIsched_ss_init_budget\fP for the function to succeed;
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if it is not, then the function shall fail. The value of \fIsched_ss_max_repl\fP
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shall be within the inclusive range [1,
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{SS_REPL_MAX}] for the function to succeed; if not, the function shall
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fail.
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.SH RETURN VALUE
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.LP
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If successful, the \fIpthread_attr_getschedparam\fP() and \fIpthread_attr_setschedparam\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_setschedparam\fP() function may fail if:
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.TP 7
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.B EINVAL
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The value of \fIparam\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_getschedpolicy\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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