/*
- * Copyright (C) 1994-1995, Index Data I/S
+ * Copyright (C) 1994-1996, Index Data I/S
* All rights reserved.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: locksrv.c,v $
- * Revision 1.1 1995-12-07 17:38:47 adam
+ * Revision 1.6 1996-10-29 14:06:52 adam
+ * Include zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.5 1996/05/15 11:58:18 adam
+ * Changed some log messages.
+ *
+ * Revision 1.4 1996/04/10 16:01:27 quinn
+ * Fixed order of path/filename.
+ *
+ * Revision 1.3 1995/12/11 11:43:29 adam
+ * Locking based on fcntl instead of flock.
+ * Setting commitEnable removed. Command line option -n can be used to
+ * prevent commit if commit setting is defined in the configuration file.
+ *
+ * Revision 1.2 1995/12/08 16:22:55 adam
+ * Work on update while servers are running. Three lock files introduced.
+ * The servers reload their registers when necessary, but they don't
+ * reestablish result sets yet.
+ *
+ * Revision 1.1 1995/12/07 17:38:47 adam
* Work locking mechanisms for concurrent updates/commit.
*
*/
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
-#include <sys/file.h>
+#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
-#include <alexutil.h>
-#include "index.h"
+#include "zserver.h"
-static int server_lock_fd = -1;
+static int server_lock_cmt = -1;
+static int server_lock_org = -1;
-int zebraServerLock (void)
+int zebraServerLock (int commitPhase)
{
char pathPrefix[1024];
char path[1024];
zebraLockPrefix (pathPrefix);
- assert (server_lock_fd == -1);
- sprintf (path, "%szebrasrv.%ld", pathPrefix, (long) getpid());
- if ((server_lock_fd = open (path, O_CREAT|O_RDWR|O_SYNC|O_EXCL, 0666))
- == -1)
+ if (server_lock_cmt == -1)
{
- logf (LOG_WARN|LOG_ERRNO, "remove stale %s", path);
- unlink (path);
- if ((server_lock_fd = open (path, O_CREAT|O_RDWR|O_SYNC|O_EXCL, 0666))
+ sprintf (path, "%s%s", pathPrefix, FNAME_COMMIT_LOCK);
+ if ((server_lock_cmt = open (path, O_CREAT|O_RDWR, 0666))
== -1)
{
logf (LOG_FATAL|LOG_ERRNO, "create %s", path);
return -1;
}
- }
- flock (server_lock_fd, LOCK_EX);
+ assert (server_lock_org == -1);
+ sprintf (path, "%s%s", pathPrefix, FNAME_ORG_LOCK);
+ if ((server_lock_org = open (path, O_CREAT|O_RDWR, 0666))
+ == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "create %s", path);
+ return -1;
+ }
+ }
+ if (commitPhase)
+ {
+ logf (LOG_DEBUG, "Server locks org");
+ zebraLock (server_lock_org, 0);
+ }
+ else
+ {
+ logf (LOG_DEBUG, "Server locks cmt");
+ zebraLock (server_lock_cmt, 0);
+ }
return 0;
}
-int zebraServerLockGetState (void)
+void zebraServerUnlock (int commitPhase)
+{
+ if (server_lock_org == -1)
+ return;
+ if (commitPhase)
+ {
+ logf (LOG_DEBUG, "Server unlocks org");
+ zebraUnlock (server_lock_org);
+ }
+ else
+ {
+ logf (LOG_DEBUG, "Server unlocks cmt");
+ zebraUnlock (server_lock_cmt);
+ }
+}
+
+int zebraServerLockGetState (time_t *timep)
{
char pathPrefix[1024];
char path[1024];
char buf[256];
int fd;
+ struct stat xstat;
zebraLockPrefix (pathPrefix);
+ sprintf (path, "%s%s", pathPrefix, FNAME_TOUCH_TIME);
+ if (stat (path, &xstat) == -1)
+ *timep = 1;
+ else
+ *timep = xstat.st_ctime;
+
sprintf (path, "%s%s", pathPrefix, FNAME_MAIN_LOCK);
fd = open (path, O_RDONLY);
if (fd == -1)
+ {
+ *buf = 0;
return 0;
+ }
if (read (fd, buf, 2) == 0)
+ {
+ *buf = 0;
return 0;
+ }
close (fd);
return *buf;
}
-
-void zebraServerLockMsg (const char *str)
-{
- int l, r;
-
- assert (server_lock_fd != -1);
- lseek (server_lock_fd, 0L, SEEK_SET);
- l = strlen(str);
- r = write (server_lock_fd, str, l);
- if (r != l)
- {
- logf (LOG_FATAL|LOG_ERRNO, "write server lock file");
- exit (1);
- }
-}
-
-void zebraServerUnlock (void)
-{
- char pathPrefix[1024];
- char path[1024];
-
- assert (server_lock_fd != -1);
- zebraLockPrefix (pathPrefix);
- flock (server_lock_fd, LOCK_UN);
- sprintf (path, "%szebrasrv.%ld", pathPrefix, (long) getpid());
- unlink (path);
-}
-