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cdac09614e
messaging system as a notification mechanism, and the speed of notification
greatly exceeds the speed of message recovery, then you get a massively (>75Mb)
growing tdb. If the message is a simple notification, then the message is
static, and you only need one of them in transit to a target process at
any one time.
This patch adds a BOOL "allow_duplicates" to the message_send_XX primitives.
If set to False, then before sending a message the sender checks the existing
message queue for a target pid for a duplicate of this message, and doesn't
add to it if one already exists.
Also added code into msgtest.c to test this.
Jeremy.
(This used to be commit 3aa7995660)
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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Copyright (C) Andrew Tridgell 2000
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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test code for internal messaging
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*/
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#define NO_SYSLOG
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#include "includes.h"
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static int pong_count;
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/****************************************************************************
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a useful function for testing the message system
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****************************************************************************/
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void pong_message(int msg_type, pid_t src, void *buf, size_t len)
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{
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pong_count++;
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}
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int main(int argc, char *argv[])
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{
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pid_t pid;
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int i, n;
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static pstring servicesf = CONFIGFILE;
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char buf[12];
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TimeInit();
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setup_logging(argv[0],True);
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charset_initialise();
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lp_load(servicesf,False,False,False);
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message_init();
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if (argc != 3) {
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fprintf(stderr, "%s: Usage - %s pid count\n", argv[0], argv[0]);
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exit(1);
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}
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pid = atoi(argv[1]);
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n = atoi(argv[2]);
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message_register(MSG_PONG, pong_message);
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for (i=0;i<n;i++) {
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message_send_pid(pid, MSG_PING, NULL, 0, True);
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}
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while (pong_count < i) {
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message_dispatch();
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msleep(1);
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}
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/* Now test that the duplicate filtering code works. */
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pong_count = 0;
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safe_strcpy(buf, "1234567890", sizeof(buf)-1);
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for (i=0;i<n;i++) {
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message_send_pid(getpid(), MSG_PING, NULL, 0, False);
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message_send_pid(getpid(), MSG_PING, buf, 11, False);
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}
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for (i=0;i<n;i++) {
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message_dispatch();
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msleep(1);
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}
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if (pong_count != 2) {
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fprintf(stderr, "Duplicate filter failed (%d).\n", pong_count);
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exit(1);
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}
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return (0);
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}
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