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- .\" Copyright (c) 1998 HD Associates, Inc.
- .\" All rights reserved.
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- .\" Redistribution and use in source and binary forms, with or without
- .\" modification, are permitted provided that the following conditions
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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.
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- .\" 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
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- .Dd March 12, 1998
- .Dt SCHED_GET_PRIORITY_MAX 2
- .Os
- .Sh NAME
- .Nm sched_get_priority_max ,
- .Nm sched_get_priority_min ,
- .Nm sched_rr_get_interval
- .Nd get scheduling parameter limits
- .Sh LIBRARY
- .Lb libc
- .Sh SYNOPSIS
- .In sched.h
- .Ft int
- .Fn sched_get_priority_max "int policy"
- .Ft int
- .Fn sched_get_priority_min "int policy"
- .Ft int
- .Fn sched_rr_get_interval "pid_t pid" "struct timespec *interval"
- .Sh DESCRIPTION
- The
- .Fn sched_get_priority_max
- and
- .Fn sched_get_priority_min
- system calls return the appropriate maximum or minimum, respectively,
- for the scheduling policy specified by
- .Fa policy .
- The
- .Fn sched_rr_get_interval
- system call updates the
- .Fa timespec
- structure referenced by the
- .Fa interval
- argument to contain the current execution time limit (i.e., time
- quantum) for the process specified by
- .Fa pid .
- If
- .Fa pid
- is zero, the current execution time limit for the calling process is
- returned.
- .Pp
- The value of
- .Fa policy
- should be one of the scheduling policy values defined in
- .Fa <sched.h> :
- .Bl -tag -width [SCHED_OTHER]
- .It Bq Er SCHED_FIFO
- First-in-first-out fixed priority scheduling with no round robin scheduling;
- .It Bq Er SCHED_OTHER
- The standard time sharing scheduler;
- .It Bq Er SCHED_RR
- Round-robin scheduling across same priority processes.
- .El
- .Sh RETURN VALUES
- If successful, the
- .Fn sched_get_priority_max
- and
- .Fn sched_get_priority_min
- system calls shall return the appropriate maximum or minimum values,
- respectively.
- If unsuccessful, they shall return a value of -1 and set
- .Fa errno
- to indicate the error.
- .Pp
- .Rv -std sched_rr_get_interval
- .Sh ERRORS
- On failure
- .Va errno
- will be set to the corresponding value:
- .Bl -tag -width Er
- .It Bq Er EINVAL
- The value of the
- .Fa policy
- argument does not represent a defined scheduling policy.
- .It Bq Er ENOSYS
- The
- .Fn sched_get_priority_max ,
- .Fn sched_get_priority_min ,
- and
- .Fn sched_rr_get_interval
- system calls are not supported by the implementation.
- .It Bq Er ESRCH
- No process can be found corresponding to that specified by
- .Fa pid .
- .El
- .Sh SEE ALSO
- .Xr sched_getparam 2 ,
- .Xr sched_getscheduler 2 ,
- .Xr sched_setparam 2 ,
- .Xr sched_setscheduler 2
- .Sh STANDARDS
- The
- .Fn sched_get_priority_max ,
- .Fn sched_get_priority_min ,
- and
- .Fn sched_rr_get_interval
- system calls conform to
- .St -p1003.1b-93 .
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