jack1/config/os/macosx/ipc.h

/*
    Copyright © Grame 2003

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    Grame Research Laboratory, 9, rue du Garet 69001 Lyon - France
    grame@rd.grame.fr
 */

#ifndef __ipc__
#define __ipc__

#include <mach/mach_error.h>
#include <servers/bootstrap.h>
#include "internal.h"
#include "engine.h"
#include "libjack/local.h"              /* JOQ: fix me */

/*
    RPC without time out can put the jack server in a blocked state
    (waiting for the client answer) when a client is killed.  The
    mach_msg function does not return any error in this case. Using
    time out solve the problem but does not seems really satisfactory.
 */

#define WAIT 2500 /* in millisecond */

static inline int
jack_client_resume (jack_client_internal_t *client)
{
	mach_msg_header_t *head =  &client->message.header;
	int err;

	if (!client->running) {
		err = mach_msg (head, MACH_RCV_MSG, 0, sizeof(client->message),
				client->serverport, 0, MACH_PORT_NULL);
		if (err) {
			jack_error ("jack_client_resume: priming receive error: %s\n",
				    mach_error_string (err));
			return -1;
		}
		client->running = TRUE;
	} else {
		/* remote port is already the send-once he sent us */
		head->msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND_ONCE, 0);
		head->msgh_local_port = MACH_PORT_NULL;
		head->msgh_size = sizeof(mach_msg_header_t);

		err = mach_msg (head, (MACH_SEND_MSG | MACH_RCV_MSG |
				       MACH_SEND_TIMEOUT | MACH_RCV_TIMEOUT),
				sizeof(*head), sizeof(client->message),
				client->serverport, WAIT, MACH_PORT_NULL);

		if (err) {

			/*
			   switch(err) {
			    case MACH_SEND_TIMED_OUT:
			             jack_error("MACH_SEND_TIMED_OUT %s\n",
			                        client->control->name);
			             break;

			       case MACH_RCV_TIMED_OUT:
			             jack_error("MACH_RCV_TIMED_OUT %s\n",
			                        client->control->name);
			             break;

			     case MACH_SEND_INVALID_DEST:
			             jack_error("MACH_SEND_INVALID_DEST %s\n",
			                        client->control->name);
			             break;
			   }
			 */

			jack_error ("jack_client_resume: send error for %s\n",
				    mach_error_string (err));
			return err;
		}
	}

	return 0;
}

static inline int
jack_client_suspend (jack_client_t * client)
{
	int err = 0;
	mach_msg_header_t * head = &client->message.header;

	head->msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND,
					  MACH_MSG_TYPE_MAKE_SEND_ONCE);
	head->msgh_remote_port = client->serverport;
	head->msgh_local_port = client->replyport;
	head->msgh_size = sizeof(mach_msg_header_t);

	err = mach_msg (head, MACH_SEND_MSG | MACH_RCV_MSG | MACH_SEND_TIMEOUT,
			sizeof(mach_msg_header_t), sizeof(client->message),
			client->replyport, WAIT, MACH_PORT_NULL);

	if (err) {
		jack_error ("jack_client_suspend: RPC error: %s\n",
			    mach_error_string (err));
		return -1;
	}

	return 0;
}

static inline void
allocate_mach_serverport (jack_engine_t * engine, jack_client_internal_t *client)
{
	char buf[256];

	snprintf (buf, 256, "JackMachPort_%d", engine->portnum);

	if (mach_port_allocate (engine->servertask, MACH_PORT_RIGHT_RECEIVE,
				&client->serverport)) {
		jack_error ("allocate_mach_serverport: can't allocate mach port");
	}

	if (mach_port_insert_right (engine->servertask, client->serverport,
				    client->serverport, MACH_MSG_TYPE_MAKE_SEND)) {
		jack_error ("allocate_mach_serverport: error inserting mach rights");
	}

	if (bootstrap_register (engine->bp, buf, client->serverport)) {
		jack_error ("allocate_mach_serverport: can't check in mach port");
	}

	client->portnum = engine->portnum;
	engine->portnum++;
}

static inline int
allocate_mach_clientport (jack_client_t * client, int portnum)
{
	char buf[256];

	snprintf (buf, 256, "JackMachPort_%d", portnum);

	if (bootstrap_look_up (client->bp, buf, &client->serverport)) {
		jack_error ("allocate_mach_clientport: can't find mach server port");
		return -1;
	}

	if (mach_port_allocate (client->clienttask, MACH_PORT_RIGHT_RECEIVE,
				&client->replyport)) {
		jack_error ("allocate_mach_clientport: can't allocate mach port");
		return -1;
	}

	return 0;
}

#endif /* __ipc__ */