Use Advisory Lock on Read

Prevent partial reads during writing while using the file driver.

Author: arcfieldOSS

phpfastcache/3.0.0/abstract.php

@@ -280,9 +280,13 @@ protected function readfile($file) {
                 throw new Exception("Can't Read File",96);
 
             }
-            while (!feof($file_handle)) {
-                $line = fgets($file_handle);
-                $string .= $line;
+            if (flock($file_handle, LOCK_SH | LOCK_NB)) {
+                while (!feof($file_handle)) {
+                    $line = fgets($file_handle);
+                    $string .= $line;
+                }
+            } else {
+                throw new Exception("Can't Read File",96);
             }
             fclose($file_handle);
 
@@ -424,4 +428,4 @@ protected function __setChmodAuto() {
     }
 
 
-}
+}