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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PTHREAD_GETSCHEDPARAM" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pthread_getschedparam 
+.SH NAME
+pthread_getschedparam, pthread_setschedparam \- dynamic thread scheduling
+parameters access (\fBREALTIME
+THREADS\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <pthread.h>
+.br
+.sp
+int pthread_getschedparam(pthread_t\fP \fIthread\fP\fB, int *restrict\fP
+\fIpolicy\fP\fB,
+.br
+\ \ \ \ \ \  struct sched_param *restrict\fP \fIparam\fP\fB);
+.br
+int pthread_setschedparam(pthread_t\fP \fIthread\fP\fB, int\fP \fIpolicy\fP\fB,
+.br
+\ \ \ \ \ \  const struct sched_param *\fP\fIparam\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpthread_getschedparam\fP() and \fIpthread_setschedparam\fP()
+functions shall, respectively, get and set the scheduling
+policy and parameters of individual threads within a multi-threaded
+process to be retrieved and set. For SCHED_FIFO and SCHED_RR,
+the only required member of the \fBsched_param\fP structure is the
+priority \fIsched_priority\fP. For SCHED_OTHER, the affected
+scheduling parameters are implementation-defined.
+.LP
+The \fIpthread_getschedparam\fP() function shall retrieve the scheduling
+policy and scheduling parameters for the thread whose
+thread ID is given by \fIthread\fP and shall store those values in
+\fIpolicy\fP and \fIparam\fP, respectively. The priority
+value returned from \fIpthread_getschedparam\fP() shall be the value
+specified by the most recent \fIpthread_setschedparam\fP(),
+\fIpthread_setschedprio\fP(), or \fIpthread_create\fP() call affecting
+the target thread. It shall not reflect any temporary
+adjustments to its priority as a result of any priority inheritance
+or ceiling functions. The \fIpthread_setschedparam\fP()
+function shall set the scheduling policy and associated scheduling
+parameters for the thread whose thread ID is given by
+\fIthread\fP to the policy and associated parameters provided in \fIpolicy\fP
+and \fIparam\fP, respectively.
+.LP
+The \fIpolicy\fP parameter may have the value SCHED_OTHER, SCHED_FIFO,
+or SCHED_RR. The scheduling parameters for the
+SCHED_OTHER policy are implementation-defined. The SCHED_FIFO and
+SCHED_RR policies shall have a single scheduling parameter,
+\fIpriority\fP.
+.LP
+If _POSIX_THREAD_SPORADIC_SERVER is defined, then the \fIpolicy\fP
+argument may have the value SCHED_SPORADIC, with the exception
+for the \fIpthread_setschedparam\fP() function that if the scheduling
+policy was not SCHED_SPORADIC at the time of the call, it is
+implementation-defined whether the function is supported; in other
+words, the implementation need not allow the application to
+dynamically change the scheduling policy to SCHED_SPORADIC. The sporadic
+server scheduling policy has the associated parameters
+\fIsched_ss_low_priority\fP, \fIsched_ss_repl_period\fP, \fIsched_ss_init_budget\fP,
+\fIsched_priority\fP, and
+\fIsched_ss_max_repl\fP. The specified \fIsched_ss_repl_period\fP
+shall be greater than or equal to the specified
+\fIsched_ss_init_budget\fP for the function to succeed; if it is not,
+then the function shall fail. The value of
+\fIsched_ss_max_repl\fP shall be within the inclusive range [1, {SS_REPL_MAX}]
+for the function to succeed; if not, the function
+shall fail. 
+.LP
+If the \fIpthread_setschedparam\fP() function fails, the scheduling
+parameters shall not be changed for the target thread.
+.SH RETURN VALUE
+.LP
+If successful, the \fIpthread_getschedparam\fP() and \fIpthread_setschedparam\fP()
+functions shall return zero; otherwise, an
+error number shall be returned to indicate the error.
+.SH ERRORS
+.LP
+The \fIpthread_getschedparam\fP() function may fail if:
+.TP 7
+.B ESRCH
+The value specified by \fIthread\fP does not refer to an existing
+thread.
+.sp
+.LP
+The \fIpthread_setschedparam\fP() function may fail if:
+.TP 7
+.B EINVAL
+The value specified by \fIpolicy\fP or one of the scheduling parameters
+associated with the scheduling policy \fIpolicy\fP is
+invalid.
+.TP 7
+.B ENOTSUP
+An attempt was made to set the policy or scheduling parameters to
+an unsupported value.
+.TP 7
+.B ENOTSUP
+An attempt was made to dynamically change the scheduling policy to
+SCHED_SPORADIC, and the implementation does not support this
+change. 
+.TP 7
+.B EPERM
+The caller does not have the appropriate permission to set either
+the scheduling parameters or the scheduling policy of the
+specified thread.
+.TP 7
+.B EPERM
+The implementation does not allow the application to modify one of
+the parameters to the value specified.
+.TP 7
+.B ESRCH
+The value specified by \fIthread\fP does not refer to a existing thread.
+.sp
+.LP
+These functions shall not return an error code of [EINTR].
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIpthread_setschedprio\fP() , \fIsched_getparam\fP() , \fIsched_getscheduler\fP()
+, the Base
+Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<pthread.h>\fP, \fI<sched.h>\fP
+.SH 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 original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .