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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: kern/server_loop.c
*
* A common server loop for builtin tasks.
*/
/*
* Must define symbols for:
* SERVER_NAME String name of this module
* SERVER_LOOP Routine name for the loop
* SERVER_DISPATCH MiG function(s) to handle message
*
* Must redefine symbols for pager_server functions.
*/
#include <kern/debug.h> /* for panic() */
#include <mach/port.h>
#include <mach/message.h>
#include <vm/vm_kern.h> /* for kernel_map */
void SERVER_LOOP(rcv_set, max_size)
{
register mach_msg_header_t *in_msg;
register mach_msg_header_t *out_msg;
register mach_msg_header_t *tmp_msg;
vm_offset_t messages;
mach_msg_return_t r;
/*
* Allocate our message buffers.
*/
messages = kalloc(2 * max_size);
if (messages == 0)
panic(SERVER_NAME);
in_msg = (mach_msg_header_t *) messages;
out_msg = (mach_msg_header_t *) (messages + max_size);
/*
* Service loop... receive messages and process them.
*/
for (;;) {
/* receive first message */
receive_msg:
r = mach_msg(in_msg, MACH_RCV_MSG, 0, max_size, rcv_set,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (r == MACH_MSG_SUCCESS)
break;
printf("%s: receive failed, 0x%x.\n", SERVER_NAME, r);
}
for (;;) {
/* process request message */
(void) SERVER_DISPATCH(in_msg, out_msg);
/* send reply and receive next request */
if (out_msg->msgh_remote_port == MACH_PORT_NULL)
goto receive_msg;
r = mach_msg(out_msg, MACH_SEND_MSG|MACH_RCV_MSG,
out_msg->msgh_size, max_size, rcv_set,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (r != MACH_MSG_SUCCESS) {
printf("%s: send/receive failed, 0x%x.\n",
SERVER_NAME, r);
goto receive_msg;
}
/* swap message buffers */
tmp_msg = in_msg; in_msg = out_msg; out_msg = tmp_msg;
}
}
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