The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_idle.c

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    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: releng/8.3/sys/kern/kern_idle.c 218352 2011-02-05 21:50:23Z kib $");
   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                 thread_lock(td);
   78                 TD_SET_CAN_RUN(td);
   79                 td->td_flags |= TDF_IDLETD | TDF_NOLOAD;
   80                 sched_class(td, PRI_IDLE);
   81                 sched_prio(td, PRI_MAX_IDLE);
   82                 thread_unlock(td);
   83 #ifdef SMP
   84         }
   85 #endif
   86 }

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