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4411688509
the license from /usr/src/COPYRIGHT. Since cvs annotate shows that this was written by jasone, julian, jhb, peter, bmilekic and obrien. cvs log shows that many others may have contributed to this file. As such, go ahead and use the author of 'FreeBSD Project' for this file. If this is a problem, please notify me. # this eliminates the last file in the kernel with an indirect reference # to /usr/src/COPYRIGHT in the kernel. A few more in userland remain.
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*-
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* Copyright (C) 2000-2004 The FreeBSD Project. 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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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/unistd.h>
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static void idle_setup(void *dummy);
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SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
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static void idle_proc(void *dummy);
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/*
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* Set up per-cpu idle process contexts. The AP's shouldn't be running or
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* accessing their idle processes at this point, so don't bother with
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* locking.
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*/
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static void
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idle_setup(void *dummy)
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{
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#ifdef SMP
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struct pcpu *pc;
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#endif
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struct proc *p;
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struct thread *td;
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int error;
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#ifdef SMP
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SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
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error = kthread_create(idle_proc, NULL, &p,
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RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
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pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
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if (pc->pc_curthread == NULL) {
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pc->pc_curthread = pc->pc_idlethread;
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pc->pc_idlethread->td_critnest = 0;
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}
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#else
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error = kthread_create(idle_proc, NULL, &p,
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RFSTOPPED | RFHIGHPID, 0, "idle");
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PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
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#endif
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if (error)
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panic("idle_setup: kthread_create error %d\n", error);
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PROC_LOCK(p);
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p->p_flag |= P_NOLOAD;
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mtx_lock_spin(&sched_lock);
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td = FIRST_THREAD_IN_PROC(p);
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TD_SET_CAN_RUN(td);
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td->td_flags |= TDF_IDLETD;
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td->td_priority = PRI_MAX_IDLE;
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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#ifdef SMP
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}
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#endif
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}
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/*
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* The actual idle process.
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*/
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static void
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idle_proc(void *dummy)
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{
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struct proc *p;
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struct thread *td;
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td = curthread;
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p = td->td_proc;
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for (;;) {
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mtx_assert(&Giant, MA_NOTOWNED);
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while (sched_runnable() == 0)
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cpu_idle();
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mtx_lock_spin(&sched_lock);
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mi_switch(SW_VOL, NULL);
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mtx_unlock_spin(&sched_lock);
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}
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}
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