Index: file.php
===================================================================
RCS file: /repository/pear/Cache/Container/file.php,v
retrieving revision 1.7
diff -u -u -r1.7 file.php
--- file.php	23 May 2002 14:16:32 -0000	1.7
+++ file.php	30 May 2002 14:20:57 -0000
@@ -107,6 +107,9 @@
         if (!($fh = @fopen($file, 'rb')))
             return new Cache_Error("Can't access cache file '$file'. Check access rights and path.", __FILE__, __LINE__);
 
+        // File locking (shared lock)
+        flock($fh, LOCK_SH);
+
         // file format:
         // 1st line: expiration date
         // 2nd line: user data
@@ -114,13 +117,17 @@
         $expire = trim(fgets($fh, 12));
         $userdata = trim(fgets($fh, 257));
         $cachedata = $this->decode(fread($fh, filesize($file)));
+
+        // Unlocking
+        flock($fh, LOCK_UN);
+
         fclose($fh);
 
         // last usage date used by the gc - maxlifetime
         // touch without second param produced stupid entries...
         touch($file,time());
         clearstatcache();
-        
+
         return array($expire, $cachedata, $userdata);
     } // end func fetch
 
@@ -137,6 +144,9 @@
         if (!($fh = @fopen($file, 'wb')))
             return new Cache_Error("Can't access '$file' to store cache data. Check access rights and path.", __FILE__, __LINE__);
 
+        // File locking (exclusive lock)
+        flock($fh, LOCK_EX);
+
         // file format:
         // 1st line: expiration date
         // 2nd line: user data
@@ -145,6 +155,9 @@
         fwrite($fh, $expires . "\n");
         fwrite($fh, $userdata . "\n");
         fwrite($fh, $this->encode($cachedata));
+
+        // File unlocking
+        flock($fh, LOCK_UN);
 
         fclose($fh);