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freebsd/sys/kern/kern_idle.c
John Baldwin 4c3558aa82 Always set a process' state to normal when it is fully constructed in
fork1() rather than only doing it for the RFSTOPPED case and then having
to fix it up in other places later on.
2004-02-05 21:01:37 +00:00

93 lines
1.9 KiB
C

/*-
* Copyright (c) 2000, All rights reserved. See /usr/src/COPYRIGHT
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/unistd.h>
static void idle_setup(void *dummy);
SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
static void idle_proc(void *dummy);
/*
* Set up per-cpu idle process contexts. The AP's shouldn't be running or
* accessing their idle processes at this point, so don't bother with
* locking.
*/
static void
idle_setup(void *dummy)
{
#ifdef SMP
struct pcpu *pc;
#endif
struct proc *p;
struct thread *td;
int error;
#ifdef SMP
SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
error = kthread_create(idle_proc, NULL, &p,
RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
if (pc->pc_curthread == NULL) {
pc->pc_curthread = pc->pc_idlethread;
pc->pc_idlethread->td_critnest = 0;
}
#else
error = kthread_create(idle_proc, NULL, &p,
RFSTOPPED | RFHIGHPID, 0, "idle");
PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
#endif
if (error)
panic("idle_setup: kthread_create error %d\n", error);
PROC_LOCK(p);
p->p_flag |= P_NOLOAD;
mtx_lock_spin(&sched_lock);
td = FIRST_THREAD_IN_PROC(p);
td->td_state = TDS_CAN_RUN;
td->td_flags |= TDF_IDLETD;
mtx_unlock_spin(&sched_lock);
PROC_UNLOCK(p);
#ifdef SMP
}
#endif
}
/*
* The actual idle process.
*/
static void
idle_proc(void *dummy)
{
struct proc *p;
struct thread *td;
td = curthread;
p = td->td_proc;
for (;;) {
mtx_assert(&Giant, MA_NOTOWNED);
while (sched_runnable() == 0)
cpu_idle();
mtx_lock_spin(&sched_lock);
td->td_state = TDS_CAN_RUN;
mi_switch(SW_VOL);
mtx_unlock_spin(&sched_lock);
}
}