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

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