diff options
Diffstat (limited to 'sys/kern/kern_idle.c')
| -rw-r--r-- | sys/kern/kern_idle.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/sys/kern/kern_idle.c b/sys/kern/kern_idle.c new file mode 100644 index 0000000..f412d17 --- /dev/null +++ b/sys/kern/kern_idle.c @@ -0,0 +1,86 @@ +/*- + * Copyright (C) 2000-2004 The FreeBSD Project. 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 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 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. + */ + +#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> +#ifdef SMP +#include <sys/smp.h> +#endif + +static void idle_setup(void *dummy); +SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL); + +/* + * 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; + + p = NULL; /* start with no idle process */ +#ifdef SMP + STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { +#endif +#ifdef SMP + error = kproc_kthread_add(sched_idletd, NULL, &p, &td, + RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid); + pc->pc_idlethread = td; +#else + error = kproc_kthread_add(sched_idletd, NULL, &p, &td, + RFSTOPPED | RFHIGHPID, 0, "idle", "idle"); + PCPU_SET(idlethread, td); +#endif + if (error) + panic("idle_setup: kproc_create error %d\n", error); + + thread_lock(td); + TD_SET_CAN_RUN(td); + td->td_flags |= TDF_IDLETD | TDF_NOLOAD; + sched_class(td, PRI_IDLE); + sched_prio(td, PRI_MAX_IDLE); + thread_unlock(td); +#ifdef SMP + } +#endif +} |
