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/*
* Copyright (c) 2007 David Teigland
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License V2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would 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.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <syslog.h>
#include <asm/types.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include "libdlm.h"
#define die(fmt, args...) \
do \
{ \
fprintf(stderr, "%s: ", prog_name); \
fprintf(stderr, fmt, ##args); \
exit(EXIT_FAILURE); \
} \
while (0)
static char *prog_name;
static dlm_lshandle_t *dh;
static int verbose;
static struct dlm_lksb lksb;
static char lvb[32];
int main(int argc, char *argv[])
{
unsigned long long offset;
unsigned long long num, last_num = 0;
unsigned int id, clients, sleeptime = 0;
unsigned long long skip = 0;
char *name;
int rv;
prog_name = argv[0];
verbose = 0;
if (argc < 5)
die("name offset id clients [sleep]\n");
name = argv[1];
offset = atoll(argv[2]);
id = atoi(argv[3]);
clients = atoi(argv[4]);
if (argc > 5)
sleeptime = atoi(argv[5]);
printf("Joining \"alternate\" lockspace...\n");
dh = dlm_create_lockspace("alternate", 0600);
if (!dh) {
printf("dlm_create_lockspace error %p %d\n",dh, errno);
return -ENOTCONN;
}
rv = dlm_ls_pthread_init(dh);
if (rv < 0) {
printf("dlm_ls_pthread_init error %d %d\n", rv, errno);
dlm_release_lockspace("alternate", dh, 1);
return rv;
}
memset(&lksb, 0, sizeof(lksb));
memset(&lvb, 0, sizeof(lvb));
lksb.sb_lvbptr = lvb;
if (verbose)
printf("request NL\n");
rv = dlm_ls_lock_wait(dh, LKM_NLMODE, &lksb, LKF_VALBLK,
name, strlen(name), 0, NULL, NULL, NULL);
while (1) {
if (verbose)
printf("convert NL->PR\n");
rv = dlm_ls_lock_wait(dh, LKM_PRMODE, &lksb,
LKF_VALBLK | LKF_CONVERT,
name, strlen(name),
0, NULL, NULL, NULL);
if (rv)
printf("lock1 error: %d %d\n", rv, lksb.sb_status);
memcpy(&num, &lvb, sizeof(num));
if (verbose)
printf("read lvb %llu\n", num);
/* it's our turn */
if (num % clients == id) {
if (last_num && last_num + clients != num + 1)
die("bad: num %llu last_num %llu\n",
num, last_num);
if (verbose)
printf("convert PR->EX\n");
rv = dlm_ls_lock_wait(dh, LKM_EXMODE, &lksb,
LKF_VALBLK | LKF_CONVERT,
name, strlen(name),
0, NULL, NULL, NULL);
if (rv)
printf("lock2 error: %d %d\n", rv,
lksb.sb_status);
memcpy(&num, &lvb, sizeof(num));
if (num % clients != id)
die("bad2: num %llu\n", num);
num++;
memcpy(&lvb, &num, sizeof(num));
printf("%llu %llu\n", num, skip);
if (verbose)
printf("convert EX->NL\n");
rv = dlm_ls_lock_wait(dh, LKM_NLMODE, &lksb,
LKF_VALBLK | LKF_CONVERT,
name, strlen(name),
0, NULL, NULL, NULL);
if (rv)
printf("lock3 error: %d %d\n", rv,
lksb.sb_status);
last_num = num;
skip = 0;
} else {
skip++;
if (verbose)
printf("convert PR->NL, skip %llu\n", skip);
rv = dlm_ls_lock_wait(dh, LKM_NLMODE, &lksb,
LKF_VALBLK | LKF_CONVERT,
name, strlen(name),
0, NULL, NULL, NULL);
if (rv)
printf("lock4 error: %d %d\n", rv,
lksb.sb_status);
}
if (sleeptime)
usleep(sleeptime);
}
dlm_ls_unlock_wait(dh, lksb.sb_lkid, 0, &lksb);
dlm_release_lockspace("alternate", dh, 1);
exit(EXIT_SUCCESS);
}
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