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-rw-r--r--lib/private/lock/memcachelockingprovider.php20
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/private/lock/memcachelockingprovider.php b/lib/private/lock/memcachelockingprovider.php
index 1334d007314..368ff450325 100644
--- a/lib/private/lock/memcachelockingprovider.php
+++ b/lib/private/lock/memcachelockingprovider.php
@@ -99,6 +99,26 @@ class MemcacheLockingProvider implements ILockingProvider {
}
/**
+ * Change the type of an existing lock
+ *
+ * @param string $path
+ * @param int $targetType self::LOCK_SHARED or self::LOCK_EXCLUSIVE
+ * @throws \OCP\Lock\LockedException
+ */
+ public function changeLock($path, $targetType) {
+ if ($targetType === self::LOCK_SHARED) {
+ if (!$this->memcache->cas($path, 'exclusive', 1)) {
+ throw new LockedException($path);
+ }
+ } else if ($targetType === self::LOCK_EXCLUSIVE) {
+ // we can only change a shared lock to an exclusive if there's only a single owner of the shared lock
+ if (!$this->memcache->cas($path, 1, 'exclusive')) {
+ throw new LockedException($path);
+ }
+ }
+ }
+
+ /**
* release all lock acquired by this instance
*/
public function releaseAll() {