summaryrefslogtreecommitdiffstats
path: root/lib/libc
diff options
context:
space:
mode:
Diffstat (limited to 'lib/libc')
-rw-r--r--lib/libc/gen/sysconf.c107
-rw-r--r--lib/libc/sys/Makefile.inc14
-rw-r--r--lib/libc/sys/sched_get_priority_max.2121
-rw-r--r--lib/libc/sys/sched_setparam.2172
-rw-r--r--lib/libc/sys/sched_setscheduler.2167
-rw-r--r--lib/libc/sys/sched_yield.259
6 files changed, 586 insertions, 54 deletions
diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index 2d9c2ed..7f14254 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -38,6 +38,7 @@
static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
#endif /* LIBC_SCCS and not lint */
+#include <sys/_posix.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/sysctl.h>
@@ -176,110 +177,110 @@ sysconf(name)
mib[1] = USER_POSIX2_UPE;
goto yesno;
-#if _POSIX_VERSION >= 199309L
- /* POSIX.4 */
+#ifdef _P1003_1B_VISIBLE
+ /* POSIX.1B */
case _SC_ASYNCHRONOUS_IO:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_ASYNCHRONOUS_IO;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
goto yesno;
case _SC_MAPPED_FILES:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MAPPED_FILES;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MAPPED_FILES;
goto yesno;
case _SC_MEMLOCK:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MEMLOCK;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MEMLOCK;
goto yesno;
case _SC_MEMLOCK_RANGE:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MEMLOCK_RANGE;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MEMLOCK_RANGE;
goto yesno;
case _SC_MEMORY_PROTECTION:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MEMORY_PROTECTION;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MEMORY_PROTECTION;
goto yesno;
case _SC_MESSAGE_PASSING:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MESSAGE_PASSING;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
goto yesno;
case _SC_PRIORITIZED_IO:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_PRIORITIZED_IO;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
goto yesno;
case _SC_PRIORITY_SCHEDULING:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_PRIORITY_SCHEDULING;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
goto yesno;
case _SC_REALTIME_SIGNALS:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_REALTIME_SIGNALS;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
goto yesno;
case _SC_SEMAPHORES:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SEMAPHORES;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SEMAPHORES;
goto yesno;
case _SC_FSYNC:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_FSYNC;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_FSYNC;
goto yesno;
case _SC_SHARED_MEMORY_OBJECTS:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SHARED_MEMORY_OBJECTS;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SHARED_MEMORY_OBJECTS;
goto yesno;
case _SC_SYNCHRONIZED_IO:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SYNCHRONIZED_IO;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
goto yesno;
case _SC_TIMERS:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_TIMERS;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_TIMERS;
goto yesno;
case _SC_AIO_LISTIO_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_AIO_LISTIO_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
goto yesno;
case _SC_AIO_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_AIO_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_AIO_MAX;
goto yesno;
case _SC_AIO_PRIO_DELTA_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_AIO_PRIO_DELTA_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
goto yesno;
case _SC_DELAYTIMER_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_DELAYTIMER_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
goto yesno;
case _SC_MQ_OPEN_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_MQ_OPEN_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
goto yesno;
case _SC_PAGESIZE:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_PAGESIZE;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_PAGESIZE;
goto yesno;
case _SC_RTSIG_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_RTSIG_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_RTSIG_MAX;
goto yesno;
case _SC_SEM_NSEMS_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SEM_NSEMS_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
goto yesno;
case _SC_SEM_VALUE_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SEM_VALUE_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
goto yesno;
case _SC_SIGQUEUE_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_SIGQUEUE_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
goto yesno;
case _SC_TIMER_MAX:
- mib[0] = CTL_POSIX4;
- mib[1] = CTL_POSIX4_TIMER_MAX;
+ mib[0] = CTL_P1003_1B;
+ mib[1] = CTL_P1003_1B_TIMER_MAX;
goto yesno;
-#endif /* _POSIX_VERSION >= 199309L */
+#endif /* _P1003_1B_VISIBLE */
yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
return (-1);
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 630b025..d36a7a2 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,5 +1,5 @@
# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
-# $Id: Makefile.inc,v 1.48 1998/03/23 06:58:06 jb Exp $
+# $Id: Makefile.inc,v 1.49 1998/03/23 21:04:06 jb Exp $
# sys sources
.PATH: ${.CURDIR}/../libc/${MACHINE_ARCH}/sys ${.CURDIR}/../libc/sys
@@ -100,6 +100,12 @@ MAN2+= _exit.2 accept.2 access.2 acct.2 adjtime.2 \
swapon.2 symlink.2 sync.2 syscall.2 truncate.2 umask.2 undelete.2 \
unlink.2 utimes.2 vfork.2 wait.2 write.2
+.if !defined(NO_P1003_1B)
+MAN2+= sched_get_priority_max.2 sched_setscheduler.2 \
+ sched_setparam.2 sched_yield.2
+.endif
+
+
MLINKS+=brk.2 sbrk.2
MLINKS+=dup.2 dup2.2
MLINKS+=chdir.2 fchdir.2
@@ -135,4 +141,10 @@ MLINKS+=syscall.2 __syscall.2
MLINKS+=truncate.2 ftruncate.2
MLINKS+=wait.2 wait3.2 wait.2 wait4.2 wait.2 waitpid.2
MLINKS+=write.2 writev.2
+.if !defined(NO_P1003_1B)
+MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
+ sched_get_priority_max.2 sched_rr_get_interval.2
+MLINKS+=sched_setscheduler.2 sched_getscheduler.2
+MLINKS+=sched_setparam.2 sched_getparam.2
+.endif
.endif
diff --git a/lib/libc/sys/sched_get_priority_max.2 b/lib/libc/sys/sched_get_priority_max.2
new file mode 100644
index 0000000..2b9fa59
--- /dev/null
+++ b/lib/libc/sys/sched_get_priority_max.2
@@ -0,0 +1,121 @@
+.\" $Id:$
+.\" 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" 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
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_GET_PRIORITY_MAX 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_get_priority_max ,
+.Nm sched_get_priority_min ,
+.Nm sched_rr_get_interval
+.Nd Get scheduling parameter limits
+.Sh SYNOPSIS
+.Fd #include <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
+functions return the appropriate maximum or minimum, respectfully,
+for the scheduling policy specified by policy. The
+.Fn sched_rr_get_interval
+function 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
+If successful, the
+.Fn sched_get_priority_max
+and
+.Fn sched_get_priority_min
+functions shall return the appropriate maximum or minimum values,
+respectively. If unsuccessful, the shall return a value of -1 and set
+.Fa errno
+to indicate the error.
+.Pp
+If successful, the
+.Fn sched_rr_get_interval
+function will return 0. Otherwise, it will
+return a value of -1 and set
+.Fa 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 EINVAL
+The value of the
+.Fa policy
+parameter 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
+functions 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_setparam 2 ,
+.Xr sched_get_scheduler 2 ,
+.Xr sched_set_scheduler 2
+.Sh STANDARDS
+The
+.Fn sched_setscheduler
+and
+.Fn sched_getscheduler
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setparam.2 b/lib/libc/sys/sched_setparam.2
new file mode 100644
index 0000000..5bbd760
--- /dev/null
+++ b/lib/libc/sys/sched_setparam.2
@@ -0,0 +1,172 @@
+.\" $Id:$
+.\" 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" 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
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_SETPARAM 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_setparam ,
+.Nm sched_getparam
+.Nd set/get scheduling paramaters
+.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_getscheduler 2 ,
+.Xr sched_setscheduler 2 ,
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setparam
+and
+.Fn sched_getparam
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setscheduler.2 b/lib/libc/sys/sched_setscheduler.2
new file mode 100644
index 0000000..7635bfe
--- /dev/null
+++ b/lib/libc/sys/sched_setscheduler.2
@@ -0,0 +1,167 @@
+.\" $Id:$
+.\" 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" 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
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_SETSCHEDULER 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_setscheduler ,
+.Nm sched_getscheduler
+.Nd set/get scheduling policy and scheduler parameters
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_setscheduler "pid_t pid" "int policy" "const struct sched_param *param"
+.Ft int
+.Fn sched_getscheduler "pid_t pid"
+.Sh DESCRIPTION
+The
+.Fn sched_setscheduler
+function sets the scheduling policy and scheduling parameters
+of the process specified by
+.Fa pid
+to
+.Fa policy
+and the parameters specified in the
+.Fa sched_param
+structure pointed to by
+.Fa param ,
+respectively.
+The value of the
+.Fa sched_priority
+member in the
+.Fa param
+structure must be any integer within the inclusive priority range for
+the scheduling policy specified by
+.Fa policy .
+.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
+policy and scheduling parameters will be set for the process
+whose process ID is equal to
+.Fa pid .
+.Pp
+If
+.Fa pid
+is zero, the scheduling policy and 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 scheduling policies are 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
+.Pp
+The
+.Fa sched_param
+structure is defined in
+.Fa <sched.h> :
+
+.Bd -literal -offset indent
+struct sched_param {
+ int sched_priority; /* scheduling priority */
+};
+.Ed
+.Pp
+The
+.Fn sched_getscheduler
+function returns the scheduling policy of the process specified
+by
+.Fa pid .
+.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_getscheduler
+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
+The value of the
+.Fa policy
+parameter is invalid, or one or more of the parameters contained in
+.Fa param
+is outside the valid range for the specified scheduling policy.
+.El
+.Sh SEE ALSO
+.Xr sched_getparam 2 ,
+.Xr sched_setparam 2 ,
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setscheduler
+and
+.Fn sched_getscheduler
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_yield.2 b/lib/libc/sys/sched_yield.2
new file mode 100644
index 0000000..b4ea28c
--- /dev/null
+++ b/lib/libc/sys/sched_yield.2
@@ -0,0 +1,59 @@
+.\" $Id:$
+.\" 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" 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
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_YIELD 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_yield
+.Nd yield processor
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_yield void
+.Sh DESCRIPTION
+The
+.Fn sched_yield
+function forces the running process to relinquish the processor until it
+again becomes the head of its process list. It takes no arguments.
+.Sh RETURN
+The
+.Fn sched_yield
+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.
+.Sh STANDARDS
+The
+.Fn sched_yield
+function conforms to
+.St -p1003.1b-93 .
OpenPOWER on IntegriCloud