X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=index%2Flockutil.c;h=bebe318bf99f54d5f19c46210a8e0db01a24fbf8;hb=4247c4670f5bc5ad61e458734a590d57be5a9f34;hp=acd65410aa3f86a6b4acad9fb56883b2be59e265;hpb=4e2fc80e64f3d7895a871ea5b08aa80045a59f2c;p=idzebra-moved-to-github.git

diff --git a/index/lockutil.c b/index/lockutil.c
index acd6541..bebe318 100644
--- a/index/lockutil.c
+++ b/index/lockutil.c
@@ -1,33 +1,149 @@
 /*
- * Copyright (C) 1994-1995, Index Data I/S 
+ * Copyright (C) 1994-1997, Index Data I/S 
  * All rights reserved.
  * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: lockutil.c,v $
- * Revision 1.1  1995-12-07 17:38:47  adam
+ * Revision 1.10  1997-09-29 09:08:36  adam
+ * Revised locking system to be thread safe for the server.
+ *
+ * Revision 1.9  1997/09/25 14:54:43  adam
+ * WIN32 files lock support.
+ *
+ * Revision 1.8  1997/09/17 12:19:15  adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.7  1997/09/09 13:38:08  adam
+ * Partial port to WIN95/NT.
+ *
+ * Revision 1.6  1996/10/29 14:08:14  adam
+ * Uses resource lockDir instead of lockPath.
+ *
+ * Revision 1.5  1996/03/26 16:01:13  adam
+ * New setting lockPath: directory of various lock files.
+ *
+ * Revision 1.4  1995/12/13  08:46:10  adam
+ * Locking uses F_WRLCK and F_RDLCK again!
+ *
+ * Revision 1.3  1995/12/12  16:00:57  adam
+ * System call sync(2) used after update/commit.
+ * Locking (based on fcntl) uses F_EXLCK and F_SHLCK instead of F_WRLCK
+ * and F_RDLCK.
+ *
+ * Revision 1.2  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 1.1  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 <fcntl.h>
 #include <string.h>
 #include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#ifdef WINDOWS
+#include <io.h>
+#include <sys/locking.h>
+#else
+#include <unistd.h>
+#endif
 
-#include <alexutil.h>
 #include "index.h"
 
-static char *lockDir = NULL;
+struct zebra_lock_info {
+    int fd;
+    int excl_flag;
+};
+
+ZebraLockHandle zebra_lock_create (const char *name, int excl_flag)
+{
+    ZebraLockHandle h = xmalloc (sizeof(*h));
+    h->excl_flag = excl_flag;
+    h->fd = -1;
+#ifdef WINDOWS
+    if (!h->excl_flag)
+        h->fd = open (name, O_BINARY|O_RDONLY);
+    if (h->fd == -1)
+        h->fd = open (name, ((h->excl_flag > 1) ? O_EXCL : 0)|
+	    (O_BINARY|O_CREAT|O_RDWR), 0666);
+#else
+    h->fd= open (name, ((h->excl_flag > 1) ? O_EXCL : 0)|
+	    (O_BINARY|O_CREAT|O_RDWR|O_SYNC), 0666);
+#endif
+    if (h->fd == -1)
+    {
+	if (h->excl_flag <= 1)
+            logf (LOG_WARN|LOG_ERRNO, "open %s", name);
+	xfree (h);
+	return NULL;
+    }
+    return h;
+}
+
+void zebra_lock_destroy (ZebraLockHandle h)
+{
+    if (!h)
+	return;
+    if (h->fd != -1)
+	close (h->fd);
+    xfree (h);
+}
+
+void zebra_lock_prefix (Res res, char *path)
+{
+    char *lock_dir = res_get_def (res, "lockDir", "");
+
+    strcpy (path, lock_dir);
+    if (*path && path[strlen(path)-1] != '/')
+        strcat (path, "/");
+}
+
+#ifdef WINDOWS
+
+#else
+static int unixLock (int fd, int type, int cmd)
+{
+    struct flock area;
+    area.l_type = type;
+    area.l_whence = SEEK_SET;
+    area.l_len = area.l_start = 0L;
+    return fcntl (fd, cmd, &area);
+}
+#endif
+
+int zebra_lock (ZebraLockHandle h)
+{
+#ifdef WINDOWS
+    return _locking (h->fd, _LK_LOCK, 1);
+#else
+    return unixLock (h->fd, h->excl_flag ? F_WRLCK : F_RDLCK, F_SETLKW);
+#endif
+}
+
+int zebra_lock_nb (ZebraLockHandle h)
+{
+#ifdef WINDOWS
+    return _locking (h->fd, _LK_NBLCK, 1);
+#else
+    return unixLock (h->fd, h->excl_flag ? F_WRLCK : F_RDLCK, F_SETLK);
+#endif
+}
+
+int zebra_unlock (ZebraLockHandle h)
+{
+#ifdef WINDOWS
+    return _locking (h->fd, _LK_UNLCK, 1);
+#else
+    return unixLock (h->fd, F_UNLCK, F_SETLKW);
+#endif
+}
 
-void zebraLockPrefix (char *pathPrefix)
+int zebra_lock_fd (ZebraLockHandle h)
 {
-    if (!lockDir)
-        lockDir = res_get_def (common_resource, "lockDir", "");
-    assert (lockDir);
-    
-    strcpy (pathPrefix, lockDir);
-    if (*pathPrefix && pathPrefix[strlen(pathPrefix)-1] != '/')
-        strcat (pathPrefix, "/");
+    return h->fd;
 }