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-.\" $FreeBSD$
-.\" Copyright (c) 1998 HD Associates, Inc.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.\"
-.Dd Mar 12, 1998
-.Dt SCHED_SETPARAM 2
-.Os BSD 4
-.Sh NAME
-.Nm sched_setparam ,
-.Nm sched_getparam
-.Nd set/get scheduling parameters
-.Sh SYNOPSIS
-.Fd #include <sched.h>
-.Ft int
-.Fn sched_setparam "pid_t pid" "const struct sched_param *param"
-.Ft int
-.Fn sched_getparam "pid_t pid" "struct sched_param *param"
-.Sh DESCRIPTION
-The
-.Fn sched_setparam
-function sets the scheduling parameters of the process specified by
-.Fa pid
-to the values specified by the
-.Fa sched_param
-structure pointed to by
-.Fa param .
-The value of the
-.Fa sched_priority
-member in the
-.Fa param
-structure must be any integer within the inclusive priority range for
-the current scheduling policy of the process specified by
-.Fa pid .
-Higher numerical values for the priority represent higher priorities.
-.Pp
-In this implementation, if the value of
-.Fa pid
-is negative the function will fail.
-.Pp
-If a process specified by
-.Fa pid
-exists and if the calling process has permission, the scheduling
-parameters are set for the process whose process ID is equal to
-.Fa pid .
-.Pp
-If
-.Fa pid
-is zero, the scheduling parameters are set for the calling process.
-.Pp
-In this implementation, the policy of when a process can affect
-the scheduling parameters of another process is specified in
-.Xr p1003_1b
-as a write-style operation.
-.Pp
-The target process, whether it is running or not running, will resume
-execution after all other runnable processes of equal or greater
-priority have been scheduled to run.
-.Pp
-If the priority of the process specified by the
-.Fa pid
-argument is set higher than that of the lowest priority running process
-and if the specified process is ready to run, the process specified by
-the
-.Fa pid
-argument will preempt a lowest priority running process.  Similarly, if
-the process calling
-.Fn sched_setparam
-sets its own priority lower than that of one or more other nonempty
-process lists, then the process that is the head of the highest priority
-list will also preempt the calling process.  Thus, in either case, the
-originating process might not receive notification of the completion of
-the requested priority change until the higher priority process has
-executed.
-.Pp
-In this implementation, when the current scheduling policy for the
-process specified by
-.Fa pid
-is normal timesharing (SCHED_OTHER, aka SCHED_NORMAL when not POSIX-source)
-or the idle policy (SCHED_IDLE when not POSIX-source) then the behavior
-is as if the process had been running under SCHED_RR with a priority
-lower than any actual realtime priority.
-.Pp
-The
-.Fn sched_getparam
-function will return the scheduling parameters of a process specified
-by
-.Fa pid
-in the
-.Fa sched_param
-structure pointed to by
-.Fa param .
-.Pp
-If a process specified by
-.Fa pid
-exists and if the calling process has permission,
-the scheduling parameters for the process whose process ID is equal to
-.Fa pid
-are returned.
-.Pp
-In this implementation, the policy of when a process can obtain the
-scheduling parameters of another process are detailed in
-.Xr p1003_1b
-as a read-style operation.
-.Pp
-If
-.Fa pid
-is zero, the scheduling parameters for the calling process will be
-returned.  In this implementation, the
-.Fa sched_getparam
-function will fail if
-.Fa pid
-is negative.
-.Sh RETURN
-The function will return zero if it completes successfully, or it
-will return a value of -1 and set
-.Va errno
-to indicate the error.
-.Sh ERRORS
-On failure
-.Va errno
-will be set to the corresponding value:
-.Bl -tag -width [EFAULT]
-.It Bq Er ENOSYS
-The system is not configured to support this functionality.
-.It Bq Er EPERM
-The requesting process doesn not have permission as detailed in
-.Xr p1003_1b .
-.It Bq Er ESRCH
-No process can be found corresponding to that specified by
-.Fa pid .
-.It Bq Er EINVAL
-For
-.Fn sched_setparam :
-one or more of the requested scheduling parameters
-is outside the range defined for the scheduling policy of the specified
-.Fa pid .
-.El
-.Sh SEE ALSO
-.Xr sched_get_priority_max 2 ,
-.Xr sched_get_priority_min 2 ,
-.Xr sched_getscheduler 2 ,
-.Xr sched_rr_get_interval 2 ,
-.Xr sched_setscheduler 2 ,
-.Xr sched_yield 2
-.Sh STANDARDS
-The
-.Fn sched_setparam 
-and
-.Fn sched_getparam
-functions conform to
-.St -p1003.1b-93 .