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4ebeef489c
which is rather tightly coupled with GNU libc, unlike the older version of this port. LinuxThreads has added many features since it was integrated with GNU libc, which means that a number of interfaces that were borrowed from libc_r are no longer needed. This updated port required a lot of reworking of the port, so there are likely to be new bugs.
321 lines
8.0 KiB
C
321 lines
8.0 KiB
C
/*
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* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Extensively modified and added to by Richard Seaman, Jr. <dick@tar.com>
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*
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*/
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <errno.h>
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#include "pthread.h"
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#include "internals.h"
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int _sched_yield(void);
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int _sched_setparam(pid_t pid, const struct sched_param *param);
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int _sched_getparam(pid_t pid, struct sched_param *param);
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int _sched_setscheduler(pid_t pid, int policy,
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const struct sched_param *param);
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int _sched_getscheduler(pid_t pid);
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int _sched_get_priority_max(int policy);
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int _sched_get_priority_min(int policy);
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int _sched_rr_get_interval(pid_t pid, struct timespec *interval);
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int __sched_setparam(pid_t pid, const struct sched_param *param);
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int __sched_setscheduler(pid_t pid, int policy,
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const struct sched_param *param);
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int __sched_getscheduler(pid_t pid);
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int __sched_get_priority_max(int policy);
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int __sched_get_priority_min(int policy);
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int __sched_getparam(pid_t pid, struct sched_param *param);
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int __sched_rr_get_interval(pid_t pid, struct timespec *interval);
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extern int _posix_priority_scheduling;
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int
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sched_yield(void)
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{
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if (_posix_priority_scheduling)
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return (_sched_yield());
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else
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syscall(SYS_yield);
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return(0);
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}
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#ifdef HAVE_FIXED_SCHED_FUNCTIONS
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int __sched_setparam(pid_t pid, const struct sched_param *param)
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{
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if (_posix_priority_scheduling)
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return (_sched_setparam(pid, param));
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else {
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errno = ENOSYS;
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return (-1);
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}
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}
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int __sched_setscheduler(pid_t pid, int policy,
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const struct sched_param *param)
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{
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if (_posix_priority_scheduling) {
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return (_sched_setscheduler(pid, policy, param));
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} else {
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errno = ENOSYS;
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return (-1);
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}
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}
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int __sched_getscheduler(pid_t pid)
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{
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if (_posix_priority_scheduling) {
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return (_sched_getscheduler(pid));
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} else {
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errno = ENOSYS;
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return (-1);
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}
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}
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int __sched_get_priority_max(int policy)
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{
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if (_posix_priority_scheduling)
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return (_sched_get_priority_max (policy));
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else
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errno = ENOSYS;
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return (-1);
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}
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int __sched_get_priority_min(int policy)
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{
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if (_posix_priority_scheduling)
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return (_sched_get_priority_min (policy));
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else
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errno = ENOSYS;
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return (-1);
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}
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int __sched_getparam(pid_t pid, struct sched_param *param)
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{
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if (_posix_priority_scheduling)
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return (_sched_getparam(pid, param));
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else {
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errno = ENOSYS;
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return (-1);
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}
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}
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int __sched_rr_get_interval(pid_t pid, struct timespec *interval)
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{
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if (_posix_priority_scheduling)
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return (_sched_rr_get_interval(pid, interval));
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else {
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errno = ENOSYS;
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return (-1);
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}
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}
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#else
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#include <sys/rtprio.h>
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#include <sys/types.h>
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/* Defines take from sys/posix4/ksched.c */
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#define p4prio_to_rtpprio(P) (RTP_PRIO_MAX - (P))
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#define rtpprio_to_p4prio(P) (RTP_PRIO_MAX - (P))
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#define P1B_PRIO_MIN rtpprio_to_p4prio(RTP_PRIO_MAX)
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#define P1B_PRIO_MAX rtpprio_to_p4prio(RTP_PRIO_MIN)
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#define p4prio_to_p_nice(P) (-(P + PRIO_MIN))
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#define p_nice_to_p4prio(P) (-(P - PRIO_MAX))
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#define P_NICE_PRIO_MIN p_nice_to_p4prio(PRIO_MAX)
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#define P_NICE_PRIO_MAX p_nice_to_p4prio(PRIO_MIN)
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int _getpriority __P((int, int));
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int _setpriority __P((int, int, int));
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int sched_setparam(pid_t pid, const struct sched_param *param)
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{
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int policy = __sched_getscheduler (pid);
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if (policy == -1)
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return (-1);
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return (__sched_setscheduler (pid, policy, param));
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}
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#pragma weak __sched_setparam=sched_setparam
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int sched_setscheduler(pid_t pid, int policy,
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const struct sched_param *param)
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{
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struct rtprio rtp;
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int max, min;
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int ret;
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int curtype;
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max = __sched_get_priority_max(policy);
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if (max == -1)
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return (-1);
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min = __sched_get_priority_min(policy);
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if (min == -1)
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return (-1);
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if (param->sched_priority > max ||
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param->sched_priority < min) {
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errno = EINVAL;
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return (-1);
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}
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switch (policy) {
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case SCHED_FIFO:
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rtp.type = RTP_PRIO_FIFO;
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rtp.prio = p4prio_to_rtpprio (param->sched_priority);
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return (rtprio (RTP_SET, pid, &rtp));
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case SCHED_RR:
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = p4prio_to_rtpprio (param->sched_priority);
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return (rtprio (RTP_SET, pid, &rtp));
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case SCHED_OTHER:
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curtype = __sched_getscheduler (pid);
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if (curtype != SCHED_OTHER) {
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = p4prio_to_rtpprio (0);
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ret = rtprio (RTP_SET, pid, &rtp);
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if (ret)
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return (ret);
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}
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return (_setpriority (PRIO_PROCESS, pid,
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p4prio_to_p_nice (param->sched_priority)));
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default:
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errno = EINVAL;
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return (-1);
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}
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}
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#pragma weak __sched_setscheduler=sched_setscheduler
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int sched_getscheduler(pid_t pid)
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{
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int ret;
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struct rtprio rtp;
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ret = rtprio (RTP_LOOKUP, pid, &rtp);
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if (!ret) {
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switch (rtp.type) {
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case RTP_PRIO_FIFO:
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ret = SCHED_FIFO;
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break;
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case RTP_PRIO_REALTIME:
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ret = SCHED_RR;
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break;
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default:
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ret = SCHED_OTHER;
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break;
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}
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}
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return (ret);
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}
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#pragma weak __sched_getscheduler=sched_getscheduler
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int sched_get_priority_max(int policy)
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{
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switch (policy)
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{
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case SCHED_FIFO:
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case SCHED_RR:
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return (P1B_PRIO_MAX);
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case SCHED_OTHER:
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return(P_NICE_PRIO_MAX);
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default:
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errno = EINVAL;
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return (-1);
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}
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}
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#pragma weak __sched_get_priority_max=sched_get_priority_max
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int sched_get_priority_min(int policy)
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{
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switch (policy)
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{
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case SCHED_FIFO:
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case SCHED_RR:
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return (P1B_PRIO_MIN);
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case SCHED_OTHER:
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return(P_NICE_PRIO_MIN);
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default:
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errno = EINVAL;
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return (-1);
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}
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}
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#pragma weak __sched_get_priority_min=sched_get_priority_min
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int sched_getparam(pid_t pid, struct sched_param *param)
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{
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int ret = 0;
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struct rtprio rtp;
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ret = rtprio (RTP_LOOKUP, pid, &rtp);
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if (!ret) {
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switch (rtp.type) {
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case RTP_PRIO_FIFO:
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case RTP_PRIO_REALTIME:
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param->sched_priority = rtpprio_to_p4prio(rtp.prio);
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break;
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default:
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errno = 0;
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ret = _getpriority (PRIO_PROCESS, pid);
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if (ret == -1 && errno != 0)
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return (-1);
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param->sched_priority = p_nice_to_p4prio(ret);
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break;
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}
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}
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return (ret);
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}
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#pragma weak __sched_getparam=sched_getparam
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int sched_rr_get_interval(pid_t pid, struct timespec *interval)
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{
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if (_posix_priority_scheduling)
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return (_sched_rr_get_interval(pid, interval));
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else {
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errno = ENOSYS;
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return (-1);
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}
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}
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#pragma weak __sched_rr_get_interval=sched_rr_get_interval
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#endif
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