added redis contrib module

sites/all/modules/contrib/dev/redis/redis.lock.inc

@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * @file
+ * Drupal core lock.inc replacement.
+ * 
+ * Do not use this file directly, it will be included by the backend specific
+ * implementation when added to settings.php file.
+ * 
+ * See README.txt file for details.
+ */
+
+// Include our own autoloader to ensure classes to be there.
+// We cannot rely on core in case of early bootstrap phases.
+require_once dirname(__FILE__) . '/redis.autoload.inc';
+
+/**
+ * Foo function, keeping it for API consistency (Drupal 7).
+ */
+function lock_initialize() {}
+
+/**
+ * Foo function, keeping it for API consistency (Drupal 6).
+ */
+function lock_init() {}
+
+/**
+ * Foo function, keeping it for API consistency.
+ * Some insane people may actually use it.
+ */
+function _lock_id() {
+  return Redis_Lock::getBackend()->getLockId();
+}
+
+function lock_acquire($name, $timeout = 30.0) {
+  return Redis_Lock::getBackend()->lockAcquire($name, $timeout);
+}
+
+function lock_may_be_available($name) {
+  return Redis_Lock::getBackend()->lockMayBeAvailable($name);
+}
+
+function lock_wait($name, $delay = 30) {
+  return Redis_Lock::getBackend()->lockWait($name, $delay);
+}
+
+function lock_release($name) {
+  return Redis_Lock::getBackend()->lockRelease($name);
+}
+
+function lock_release_all($lock_id = NULL) {
+  return Redis_Lock::getBackend()->lockReleaseAll($lock_id);
+}
+
+// Since D6 doesn't have the drupal_register_shutdown_function
+// that is called in lib/Redis/Lock/Backend/Default.php define
+// the wrapper here.
+if (!function_exists('drupal_register_shutdown_function')) {
+  function drupal_register_shutdown_function(){
+    $args = func_get_args();
+    call_user_func_array('register_shutdown_function', $args);
+  }
+}