147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/* $OpenBSD: kern_kthread.c,v 1.46 2021/11/26 04:42:13 visa Exp $ */
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/* $NetBSD: kern_kthread.c,v 1.3 1998/12/22 21:21:36 kleink Exp $ */
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/*-
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* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kthread.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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int kthread_create_now;
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/*
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* Fork a kernel thread. Any process can request this to be done.
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* The VM space and limits, etc. will be shared with proc0.
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*/
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int
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kthread_create(void (*func)(void *), void *arg,
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struct proc **newpp, const char *name)
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{
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struct proc *p;
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int error;
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KERNEL_LOCK();
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/*
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* First, create the new process. Share the memory, file
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* descriptors and don't leave the exit status around for the
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* parent to wait for.
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*/
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error = fork1(&proc0, FORK_SHAREVM|FORK_SHAREFILES|FORK_NOZOMBIE|
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FORK_SYSTEM, func, arg, NULL, &p);
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if (error) {
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KERNEL_UNLOCK();
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return (error);
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}
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/* Name it as specified. */
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strlcpy(p->p_p->ps_comm, name, sizeof p->p_p->ps_comm);
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KERNEL_UNLOCK();
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/* All done! */
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if (newpp != NULL)
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*newpp = p;
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return (0);
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}
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/*
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* Cause a kernel thread to exit. Assumes the exiting thread is the
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* current context.
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*/
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void
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kthread_exit(int ecode)
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{
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/*
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* XXX What do we do with the exit code? Should we even bother
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* XXX with it? The parent (proc0) isn't going to do much with
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* XXX it.
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*/
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if (ecode != 0)
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printf("WARNING: thread `%s' (%d) exits with status %d\n",
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curproc->p_p->ps_comm, curproc->p_tid, ecode);
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exit1(curproc, ecode, 0, EXIT_NORMAL);
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/* NOTREACHED */
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}
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struct kthread_q {
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SIMPLEQ_ENTRY(kthread_q) kq_q;
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void (*kq_func)(void *);
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void *kq_arg;
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};
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SIMPLEQ_HEAD(, kthread_q) kthread_q = SIMPLEQ_HEAD_INITIALIZER(kthread_q);
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/*
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* Defer the creation of a kernel thread. Once the standard kernel threads
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* and processes have been created, this queue will be run to callback to
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* the caller to create threads for e.g. file systems and device drivers.
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*/
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void
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kthread_create_deferred(void (*func)(void *), void *arg)
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{
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struct kthread_q *kq;
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if (kthread_create_now) {
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(*func)(arg);
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return;
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}
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kq = malloc(sizeof *kq, M_TEMP, M_NOWAIT|M_ZERO);
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if (kq == NULL)
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panic("unable to allocate kthread_q");
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kq->kq_func = func;
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kq->kq_arg = arg;
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SIMPLEQ_INSERT_TAIL(&kthread_q, kq, kq_q);
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}
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void
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kthread_run_deferred_queue(void)
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{
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struct kthread_q *kq;
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/* No longer need to defer kthread creation. */
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kthread_create_now = 1;
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while ((kq = SIMPLEQ_FIRST(&kthread_q)) != NULL) {
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SIMPLEQ_REMOVE_HEAD(&kthread_q, kq_q);
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(*kq->kq_func)(kq->kq_arg);
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free(kq, M_TEMP, sizeof(*kq));
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}
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}
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