NetBSD/sys/compat/mach/mach_thread.c

/*	$NetBSD: mach_thread.c,v 1.12 2003/01/08 00:39:44 simonb Exp $ */

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Emmanuel Dreyfus
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mach_thread.c,v 1.12 2003/01/08 00:39:44 simonb Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/signal.h>
#include <sys/lock.h>
#include <sys/queue.h>
#include <sys/proc.h>

#include <compat/mach/mach_types.h>
#include <compat/mach/mach_message.h>
#include <compat/mach/mach_exec.h>
#include <compat/mach/mach_clock.h>
#include <compat/mach/mach_port.h>
#include <compat/mach/mach_thread.h>
#include <compat/mach/mach_errno.h>
#include <compat/mach/mach_syscallargs.h>

int
mach_sys_syscall_thread_switch(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct mach_sys_syscall_thread_switch_args /* {
		syscallarg(mach_port_name_t) thread_name;
		syscallarg(int) option;
		syscallarg(mach_msg_timeout_t) option_time;
	} */ *uap = v;
	int timeout;
	struct mach_emuldata *med;
		
	med = (struct mach_emuldata *)p->p_emuldata;
	timeout = SCARG(uap, option_time) * hz / 1000;

	/*
	 * The day we will be able to find out the struct proc from 
	 * the port number, try to use preempt() to call the right thread.
	 * [- but preempt() is for _involuntary_ context switches.]
	 */
	switch(SCARG(uap, option)) {
	case MACH_SWITCH_OPTION_NONE:
		yield();
		break;

	case MACH_SWITCH_OPTION_WAIT:
		med->med_thpri = 1;
		while (med->med_thpri != 0)
			(void)tsleep(&med->med_thpri, PZERO|PCATCH, 
			    "thread_switch", timeout);
		break;

	case MACH_SWITCH_OPTION_DEPRESS:
	case MACH_SWITCH_OPTION_IDLE:
		/* Use a callout to restore the priority after depression? */
		med->med_thpri = p->p_priority;
		p->p_priority = MAXPRI;
		break;

	default:
		uprintf("mach_sys_syscall_thread_switch(): unknown option %d\n",		    SCARG(uap, option));
		break;
	}
	return 0;
}


int 
mach_thread_policy(args)
	struct mach_trap_args *args;
{
	mach_thread_policy_request_t *req = args->smsg;
	mach_thread_policy_reply_t *rep = args->rmsg;
	size_t *msglen = args->rsize;

	rep->rep_msgh.msgh_bits =
	    MACH_MSGH_REPLY_LOCAL_BITS(MACH_MSG_TYPE_MOVE_SEND_ONCE);
	rep->rep_msgh.msgh_size = sizeof(*rep) - sizeof(rep->rep_trailer);
	rep->rep_msgh.msgh_local_port = req->req_msgh.msgh_local_port;
	rep->rep_msgh.msgh_id = req->req_msgh.msgh_id + 100;
	rep->rep_trailer.msgh_trailer_size = 8;

	*msglen = sizeof(*rep);
	return 0;
}

int 
mach_thread_create_running(args)
	struct mach_trap_args *args;
{
	mach_thread_create_running_request_t *req = args->smsg;
	mach_thread_create_running_reply_t *rep = args->rmsg;
	size_t *msglen = args->rsize;
	struct proc *p = args->p;
	struct mach_create_thread_child_args mctc;
	register_t retval;
	struct proc *child;
	int flags;
	int error;

	/* 
	 * Prepare the data we want to transmit to the child
	 */
	mctc.mctc_proc = &child;
	mctc.mctc_flavor = req->req_flavor;
	mctc.mctc_child_done = 0;
	mctc.mctc_state = req->req_state;

	flags = (FORK_SHAREVM | FORK_SHARECWD | 
	    FORK_SHAREFILES | FORK_SHARESIGS);
	if ((error = fork1(p, flags, SIGCHLD, NULL, 0, 
	    mach_create_thread_child, (void *)&mctc, &retval, &child)) != 0)
		return mach_msg_error(args, error);
		
	/* 
	 * The child relies on some values in mctc, so we should not
	 * exit until it is finished with it. We loop to avoid
	 * spurious wakeups due to signals.
	 */
	while(mctc.mctc_child_done == 0)
		(void)tsleep(&mctc.mctc_child_done, PZERO, "mach_thread", 0);

	rep->rep_msgh.msgh_bits =
	    MACH_MSGH_REPLY_LOCAL_BITS(MACH_MSG_TYPE_MOVE_SEND_ONCE);
	rep->rep_msgh.msgh_size = sizeof(*rep) - sizeof(rep->rep_trailer);
	rep->rep_msgh.msgh_local_port = req->req_msgh.msgh_local_port;
	rep->rep_msgh.msgh_id = req->req_msgh.msgh_id + 100;
	/* XXX do something for rep->rep_child_act */
	rep->rep_trailer.msgh_trailer_size = 8;

	*msglen = sizeof(*rep);
	return 0;
}

/* 
 * Duplicate the right of p1 into p2 on thread creation.
 * This will disappear the day we will have struct lwp. 
 * XXX mr_p is not accurate anymore, this might introduce
 * some problems.
 */
void
mach_copy_right(p1, p2)
	struct proc *p1;
	struct proc *p2;
{
	struct mach_emuldata *med1;
	struct mach_emuldata *med2;
	struct mach_right *mr;

	med1 = (struct mach_emuldata *)p1->p_emuldata;
	med2 = (struct mach_emuldata *)p2->p_emuldata;

	/* Undo what mach_e_proc_init did */
	if (--med2->med_bootstrap->mp_refcount == 0)
		mach_port_put(med2->med_bootstrap);
	if (--med2->med_kernel->mp_refcount == 0)
		mach_port_put(med2->med_kernel);
	if (--med2->med_host->mp_refcount == 0)
		mach_port_put(med2->med_host);
	if (--med2->med_exception->mp_refcount == 0)
		mach_port_put(med2->med_exception);

	/* 
	 * Share ports and rights with the parent, bump their reference
	 * counts so that if p2 deallocates some right, p1 is still able 
	 * to use it.
	 */
	med2->med_right = med1->med_right;
	LIST_FOREACH(mr, &med2->med_right, mr_list)
		mr->mr_refcount++;

	med2->med_bootstrap->mp_refcount++;
	med2->med_kernel->mp_refcount++;
	med2->med_host->mp_refcount++;
	med2->med_exception->mp_refcount++;

	med2->med_bootstrap = med1->med_bootstrap;
	med2->med_kernel = med1->med_kernel;
	med2->med_host = med1->med_host;
	med2->med_exception = med1->med_exception;

	return;
}