freebsd-skq/sys/kern/kern_idle.c
jhb 1b16b181d1 - Change mi_switch() and sched_switch() to accept an optional thread to
switch to.  If a non-NULL thread pointer is passed in, then the CPU will
  switch to that thread directly rather than calling choosethread() to pick
  a thread to choose to.
- Make sched_switch() aware of idle threads and know to do
  TD_SET_CAN_RUN() instead of sticking them on the run queue rather than
  requiring all callers of mi_switch() to know to do this if they can be
  called from an idlethread.
- Move constants for arguments to mi_switch() and thread_single() out of
  the middle of the function prototypes and up above into their own
  section.
2004-07-02 19:09:50 +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_SET_CAN_RUN(td);
td->td_flags |= TDF_IDLETD;
td->td_priority = PRI_MAX_IDLE;
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);
mi_switch(SW_VOL, NULL);
mtx_unlock_spin(&sched_lock);
}
}