FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_idle.c
1 /*-
2 * Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: src/sys/kern/kern_idle.c,v 1.54 2008/03/16 10:58:05 rwatson Exp $");
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/kthread.h>
33 #include <sys/lock.h>
34 #include <sys/mutex.h>
35 #include <sys/proc.h>
36 #include <sys/resourcevar.h>
37 #include <sys/sched.h>
38 #include <sys/unistd.h>
39 #ifdef SMP
40 #include <sys/smp.h>
41 #endif
42
43 static void idle_setup(void *dummy);
44 SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL);
45
46 /*
47 * Set up per-cpu idle process contexts. The AP's shouldn't be running or
48 * accessing their idle processes at this point, so don't bother with
49 * locking.
50 */
51 static void
52 idle_setup(void *dummy)
53 {
54 #ifdef SMP
55 struct pcpu *pc;
56 #endif
57 struct proc *p;
58 struct thread *td;
59 int error;
60
61 p = NULL; /* start with no idle process */
62 #ifdef SMP
63 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
64 #endif
65 #ifdef SMP
66 error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
67 RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid);
68 pc->pc_idlethread = td;
69 #else
70 error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
71 RFSTOPPED | RFHIGHPID, 0, "idle", "idle");
72 PCPU_SET(idlethread, td);
73 #endif
74 if (error)
75 panic("idle_setup: kproc_create error %d\n", error);
76
77 p->p_flag |= P_NOLOAD;
78 thread_lock(td);
79 TD_SET_CAN_RUN(td);
80 td->td_flags |= TDF_IDLETD;
81 sched_class(td, PRI_IDLE);
82 sched_prio(td, PRI_MAX_IDLE);
83 thread_unlock(td);
84 #ifdef SMP
85 }
86 #endif
87 }
88
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