a0fac8a7bc
kthread_create(). Implement kthread_exit() (causes a thrad to exit). Set P_NOCLDWAIT on kernel threads, which will cause any of their children to be reparented to init(8) (which is already prepared to wait out orphaned processes).
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/* $NetBSD: kern_kthread.c,v 1.1 1998/11/11 22:44:24 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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/kernel.h>
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#include <sys/kthread.h>
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#include <sys/proc.h>
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#include <sys/wait.h>
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/*
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* note that stdarg.h and the ansi style va_start macro is used for both
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* ansi and traditional c complers.
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* XXX: this requires that stdarg.h define: va_alist and va_dcl
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*/
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#include <machine/stdarg.h>
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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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#ifdef __STDC__
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kthread_create(void (*func)(void *), void *arg,
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struct proc **newpp, const char *fmt, ...)
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#else
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kthread_create(func, arg, newpp, fmt, va_alist)
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void (*func) __P((void *));
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void *arg;
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struct proc **newpp;
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const char *fmt;
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va_dcl
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#endif
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{
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struct proc *p2;
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int error;
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va_list ap;
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/* First, create the new process. */
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error = fork1(&proc0, FORK_SHAREVM, NULL, &p2);
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if (error)
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return (error);
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/*
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* Mark it as a system process and not a candidate for
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* swapping. Set P_NOCLDWAIT so that children are reparented
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* to init(8) when they exit. init(8) can easily wait them
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* out for us.
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*/
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p2->p_flag |= P_INMEM | P_SYSTEM | P_NOCLDWAIT; /* XXX */
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/* Name it as specified. */
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va_start(ap, fmt);
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vsprintf(p2->p_comm, fmt, ap);
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va_end(ap);
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/* Arrange for it to start at the specified function. */
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cpu_set_kpc(p2, func, arg);
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/* All done! */
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if (newpp != NULL)
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*newpp = p2;
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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(ecode)
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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_comm, curproc->p_pid, ecode);
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exit1(curproc, W_EXITCODE(ecode, 0));
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/*
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* XXX Fool the compiler. Making exit1() __noreturn__ is a can
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* XXX of worms right now.
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*/
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for (;;);
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}
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