* Sebastian Hammer, Adam Dickmeiss
*
* $Log: lockidx.c,v $
- * Revision 1.1 1995-12-07 17:38:47 adam
+ * Revision 1.2 1995-12-08 16:22:54 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 "index.h"
static int lock_fd = -1;
+static int server_lock_cmt = -1;
+static int server_lock_org = -1;
+
+int zebraIndexWait (int commitPhase)
+{
+ char pathPrefix[1024];
+ char path[1024];
+ int fd;
+
+ zebraLockPrefix (pathPrefix);
+
+ if (server_lock_cmt == -1)
+ {
+ sprintf (path, "%s%s", FNAME_COMMIT_LOCK, pathPrefix);
+ if ((server_lock_cmt = open (path, O_CREAT|O_RDWR|O_SYNC, 0666))
+ == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "create %s", path);
+ return -1;
+ }
+ }
+ else
+ flock (server_lock_cmt, LOCK_UN);
+ if (server_lock_org == -1)
+ {
+ sprintf (path, "%s%s", FNAME_ORG_LOCK, pathPrefix);
+ if ((server_lock_org = open (path, O_CREAT|O_RDWR|O_SYNC, 0666))
+ == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "create %s", path);
+ return -1;
+ }
+ }
+ else
+ flock (server_lock_org, LOCK_UN);
+ if (commitPhase)
+ fd = server_lock_cmt;
+ else
+ fd = server_lock_org;
+ if (flock (fd, LOCK_EX|LOCK_NB) == -1)
+ {
+ if (errno != EWOULDBLOCK)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "flock");
+ exit (1);
+ }
+ if (commitPhase)
+ logf (LOG_LOG, "Waiting for lock cmt");
+ else
+ logf (LOG_LOG, "Waiting for lock org");
+ if (flock (fd, LOCK_EX) == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "flock");
+ exit (1);
+ }
+ }
+ flock (fd, LOCK_UN);
+ return 0;
+}
+
void zebraIndexLockMsg (const char *str)
{
- int l, r;
+ char path[1024];
+ char pathPrefix[1024];
+ int l, r, fd;
assert (lock_fd != -1);
lseek (lock_fd, 0L, SEEK_SET);
logf (LOG_FATAL|LOG_ERRNO, "write lock file");
exit (1);
}
+ zebraLockPrefix (pathPrefix);
+ sprintf (path, "%s%s", pathPrefix, FNAME_TOUCH_TIME);
+ fd = creat (path, 0666);
+ close (fd);
}
-void zebraIndexUnlock (int rw)
+void zebraIndexUnlock (void)
{
char path[1024];
char pathPrefix[1024];
- if (lock_fd == -1)
- return;
-
zebraLockPrefix (pathPrefix);
sprintf (path, "%s%s", pathPrefix, FNAME_MAIN_LOCK);
unlink (path);
}
-void zebraIndexLock (int rw)
+void zebraIndexLock (int commitNow)
{
char path[1024];
char pathPrefix[1024];
char buf[256];
int r;
+ if (lock_fd != -1)
+ return ;
zebraLockPrefix (pathPrefix);
sprintf (path, "%s%s", pathPrefix, FNAME_MAIN_LOCK);
- if (rw)
+ while (1)
{
- while (1)
+ lock_fd = open (path, O_CREAT|O_RDWR|O_EXCL|O_SYNC, 0666);
+ if (lock_fd == -1)
{
- lock_fd = open (path, O_CREAT|O_RDWR|O_EXCL|O_SYNC, 0666);
- if (lock_fd == -1)
+ lock_fd = open (path, O_RDONLY);
+ assert (lock_fd != -1);
+ if (flock (lock_fd, LOCK_EX|LOCK_NB) == -1)
{
- lock_fd = open (path, O_RDONLY);
- assert (lock_fd != -1);
- if (flock (lock_fd, LOCK_EX|LOCK_NB) == -1)
+ if (errno == EWOULDBLOCK)
{
- if (errno == EWOULDBLOCK)
- {
- logf (LOG_LOG, "Waiting for other index process");
- flock (lock_fd, LOCK_EX);
- continue;
- }
- else
- {
- logf (LOG_FATAL|LOG_ERRNO, "flock %s", path);
- exit (1);
- }
+ logf (LOG_LOG, "Waiting for other index process");
+ flock (lock_fd, LOCK_EX);
+ continue;
}
else
{
- logf (LOG_WARN, "Unlocked %s", path);
- r = read (lock_fd, buf, 256);
- if (r == 0)
- {
- logf (LOG_WARN, "Zero length %s", path);
- unlink (path);
- close (lock_fd);
- continue;
- }
- else if (r == -1)
- {
- logf (LOG_FATAL|LOG_ERRNO, "read %s", path);
- exit (1);
- }
- if (*buf == 'r')
+ logf (LOG_FATAL|LOG_ERRNO, "flock %s", path);
+ exit (1);
+ }
+ }
+ else
+ {
+ logf (LOG_WARN, "Unlocked %s", path);
+ r = read (lock_fd, buf, 256);
+ if (r == 0)
+ {
+ logf (LOG_WARN, "Zero length %s", path);
+ close (lock_fd);
+ unlink (path);
+ continue;
+ }
+ else if (r == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "read %s", path);
+ exit (1);
+ }
+ if (*buf == 'r')
+ {
+ logf (LOG_WARN, "Previous transaction didn't"
+ " reach commit");
+ close (lock_fd);
+ bf_commitClean ();
+ unlink (path);
+ continue;
+ }
+ else if (*buf == 'd')
+ {
+ logf (LOG_WARN, "Commit file wan't deleted after commit");
+ close (lock_fd);
+ bf_commitClean ();
+ unlink (path);
+ continue;
+ }
+ else if (*buf == 'w')
+ {
+ logf (LOG_WARN, "Your index may be inconsistent");
+ exit (1);
+ }
+ else if (*buf == 'c')
+ {
+ if (commitNow)
{
- logf (LOG_WARN, "Previous transaction didn't"
- " reach commit");
unlink (path);
close (lock_fd);
continue;
}
- else if (*buf == 'w')
- {
- logf (LOG_WARN, "Your index may be inconsistent");
- exit (1);
- }
- else if (*buf == 'c')
- {
- logf (LOG_FATAL, "Previous transaction didn't"
- " finish commit. Restore now!");
- exit (1);
- }
- else
- {
- logf (LOG_FATAL, "Unknown id 0x%02x in %s", *buf,
- path);
- exit (1);
- }
+ logf (LOG_FATAL, "Previous transaction didn't"
+ " finish commit. Commit now!");
+ exit (1);
+ }
+ else
+ {
+ logf (LOG_FATAL, "Unknown id 0x%02x in %s", *buf,
+ path);
+ exit (1);
}
}
- else
- break;
}
- flock (lock_fd, LOCK_EX);
+ else
+ break;
}
-}
-
-void zebraIndexLockCommit (void)
-{
-
+ flock (lock_fd, LOCK_EX);
}
projects / idzebra-moved-to-github.git / blobdiff