Multiple registers (alpha early)

[idzebra-moved-to-github.git] / index / lockutil.c

diff --git a/index/lockutil.c b/index/lockutil.c
index d59067f..cbfbb97 100644 (file)
--- a/index/lockutil.c
+++ b/index/lockutil.c
@@ -1,28 +1,9 @@
 /*
- * Copyright (C) 1994-1995, Index Data I/S 
+ * Copyright (C) 1994-2002, Index Data
  * All rights reserved.
  * Sebastian Hammer, Adam Dickmeiss
  *
- * $Log: lockutil.c,v $
- * 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.
- *
+ * $Id: lockutil.c,v 1.15 2002-04-04 14:14:13 adam Exp $
  */
 #include <stdio.h>
 #include <assert.h>
@@ -30,25 +11,104 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/types.h>
+#ifdef WIN32
+#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;
+};
 
-void zebraLockPrefix (char *pathPrefix)
+char *zebra_mk_fname (const char *dir, const char *name)
 {
-    if (!lockDir)
-        lockDir = res_get_def (common_resource, "lockPath", "");
-    assert (lockDir);
+    int dlen = dir ? strlen(dir) : 0;
+    char *fname = xmalloc (dlen + strlen(name) + 3);
+
+#ifdef WIN32
+    if (dlen)
+    {
+        int last_one = dir[dlen-1];
+
+        if (!strchr ("/\\:", last_one))
+            sprintf (fname, "%s\\%s", dir, name);
+        else
+            sprintf (fname, "%s%s", dir, name);
+    }
+    else
+        sprintf (fname, "%s", name);
+#else
+    if (dlen)
+    {
+        int last_one = dir[dlen-1];
+
+        if (!strchr ("/", last_one))
+            sprintf (fname, "%s/%s", dir, name);
+        else
+            sprintf (fname, "%s%s", dir, name);
+    }
+    else
+        sprintf (fname, "%s", name);
+#endif
+    return fname;
+}
+
+ZebraLockHandle zebra_lock_create (const char *dir,
+                                   const char *name, int excl_flag)
+{
+    char *fname = zebra_mk_fname(dir, name);
+    ZebraLockHandle h = (ZebraLockHandle) xmalloc (sizeof(*h));
+
+    h->excl_flag = excl_flag;
+    h->fd = -1;
+
     
-    strcpy (pathPrefix, lockDir);
-    if (*pathPrefix && pathPrefix[strlen(pathPrefix)-1] != '/')
-        strcat (pathPrefix, "/");
+#ifdef WIN32
+    if (!h->excl_flag)
+        h->fd = open (name, O_BINARY|O_RDONLY);
+    if (h->fd == -1)
+        h->fd = open (fname, ((h->excl_flag > 1) ? O_EXCL : 0)|
+           (O_BINARY|O_CREAT|O_RDWR), 0666);
+#else
+    h->fd= open (fname, ((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", fname);
+       xfree (h);
+        h = 0;
+    }
+    xfree (fname);
+    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, "/");
 }
 
-static int intLock (int fd, int type, int cmd)
+#ifndef WIN32
+static int unixLock (int fd, int type, int cmd)
 {
     struct flock area;
     area.l_type = type;
@@ -56,26 +116,54 @@ static int intLock (int fd, int type, int cmd)
     area.l_len = area.l_start = 0L;
     return fcntl (fd, cmd, &area);
 }
+#endif
+
+int zebra_lock_w (ZebraLockHandle h)
+{
+#ifdef WIN32
+    return _locking (h->fd, _LK_LOCK, 1);
+#else
+    return unixLock (h->fd, F_WRLCK, F_SETLKW);
+#endif
+}
+
+int zebra_lock_r (ZebraLockHandle h)
+{
+#ifdef WIN32
+    return _locking (h->fd, _LK_LOCK, 1);
+#else
+    return unixLock (h->fd, F_RDLCK, F_SETLKW);
+#endif
+}
+
+int zebra_lock (ZebraLockHandle h)
+{
+#ifdef WIN32
+    return _locking (h->fd, _LK_LOCK, 1);
+#else
+    return unixLock (h->fd, h->excl_flag ? F_WRLCK : F_RDLCK, F_SETLKW);
+#endif
+}
 
-int zebraLock (int fd, int wr)
+int zebra_lock_nb (ZebraLockHandle h)
 {
-#if 0
-    return intLock (fd, wr ? F_EXLCK : F_SHLCK, F_SETLKW);
+#ifdef WIN32
+    return _locking (h->fd, _LK_NBLCK, 1);
 #else
-    return intLock (fd, wr ? F_WRLCK : F_RDLCK, F_SETLKW);
+    return unixLock (h->fd, h->excl_flag ? F_WRLCK : F_RDLCK, F_SETLK);
 #endif
 }
 
-int zebraLockNB (int fd, int wr)
+int zebra_unlock (ZebraLockHandle h)
 {
-#if 0
-    return intLock (fd, wr ? F_EXLCK : F_SHLCK, F_SETLK);
+#ifdef WIN32
+    return _locking (h->fd, _LK_UNLCK, 1);
 #else
-    return intLock (fd, wr ? F_WRLCK : F_RDLCK, F_SETLK);
+    return unixLock (h->fd, F_UNLCK, F_SETLKW);
 #endif
 }
 
-int zebraUnlock (int fd)
+int zebra_lock_fd (ZebraLockHandle h)
 {
-    return intLock (fd, F_UNLCK, F_SETLKW);
+    return h->fd;
 }