2 * Copyright (c) 1999 Peter Wemm <peter@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/kern_kthread.c,v 1.5.2.3 2001/12/25 01:51:14 dillon Exp $
27 * $DragonFly: src/sys/kern/kern_kthread.c,v 1.6 2003/06/27 01:53:25 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/kthread.h>
34 #include <sys/ptrace.h>
35 #include <sys/resourcevar.h>
36 #include <sys/signalvar.h>
37 #include <sys/unistd.h>
40 #include <machine/stdarg.h>
43 * Start a kernel process. This is called after a fork() call in
44 * mi_startup() in the file kern/init_main.c.
46 * This function is used to start "internal" daemons and intended
47 * to be called from SYSINIT().
53 const struct kproc_desc *kp = udata;
56 error = kthread_create((void (*)(void *))kp->func, NULL,
57 kp->global_threadpp, kp->arg0);
59 panic("kproc_start: %s: error %d", kp->arg0, error);
63 * Create a kernel process/thread/whatever. It shares it's address space
64 * with proc0 - ie: kernel only.
67 kthread_create(void (*func)(void *), void *arg,
68 struct thread **tdp, const char *fmt, ...)
73 td = *tdp = lwkt_alloc_thread();
74 cpu_set_thread_handler(td, kthread_exit, func, arg);
77 * Set up arg0 for 'ps' etc
80 vsnprintf(td->td_comm, sizeof(td->td_comm), fmt, ap);
84 * Schedule the thread to run
91 * YYY kthread_exit() should get rid of the kthread. We have to put it on
92 * some sort of wait list and set our switcher to interlock against
98 thread_t td = curthread;
100 printf("kthread %p %s has exited\n", td, td->td_comm); /* YYY */
102 td->td_flags |= TDF_STOPREQ;
103 kproc_suspend_loop();
108 * Advise a kernel process to suspend (or resume) in its main loop.
109 * Participation is voluntary.
112 suspend_kproc(struct thread *td, int timo)
114 if (td->td_proc == NULL) {
115 td->td_flags |= TDF_STOPREQ; /* request thread exit */
117 while (td->td_flags & TDF_STOPREQ) {
118 int error = tsleep(td, PPAUSE, "suspkp", timo);
119 if (error == EWOULDBLOCK)
122 td->td_flags &= ~TDF_STOPREQ;
125 return(EINVAL); /* not a kernel thread */
130 kproc_suspend_loop(void)
132 struct thread *td = curthread;
134 if (td->td_flags & TDF_STOPREQ) {
135 td->td_flags &= ~TDF_STOPREQ;
136 while ((td->td_flags & TDF_WAKEREQ) == 0) {
138 tsleep(td, PPAUSE, "kpsusp", 0);
140 td->td_flags &= ~TDF_WAKEREQ;