From 9677681a37b2e999558f30e9383ea2a9bf9f8c24 Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Mon, 2 May 2016 14:18:46 +0200
Subject: [PATCH] free up memory when releasing the last shared lock

---
 lib/private/Lock/AbstractLockingProvider.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/private/Lock/AbstractLockingProvider.php b/lib/private/Lock/AbstractLockingProvider.php
index f96358778c..9497729015 100644
--- a/lib/private/Lock/AbstractLockingProvider.php
+++ b/lib/private/Lock/AbstractLockingProvider.php
@@ -77,6 +77,9 @@ abstract class AbstractLockingProvider implements ILockingProvider {
 		if ($type === self::LOCK_SHARED) {
 			if (isset($this->acquiredLocks['shared'][$path]) and $this->acquiredLocks['shared'][$path] > 0) {
 				$this->acquiredLocks['shared'][$path]--;
+				if ($this->acquiredLocks['shared'][$path] === 0) {
+					unset($this->acquiredLocks['shared'][$path]);
+				}
 			}
 		} else if ($type === self::LOCK_EXCLUSIVE) {
 			unset($this->acquiredLocks['exclusive'][$path]);