From ac1eaff6ecb48b54ceafbddcc90e2b23ebb8039d Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 30 Dec 2015 06:13:49 +0100
Subject: [PATCH] thread/Mutex: add class ScopeUnlock()

---
 src/thread/Mutex.hxx | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/thread/Mutex.hxx b/src/thread/Mutex.hxx
index bc4deebdd..1756bddf3 100644
--- a/src/thread/Mutex.hxx
+++ b/src/thread/Mutex.hxx
@@ -58,4 +58,24 @@ public:
 	ScopeLock &operator=(const ScopeLock &other) = delete;
 };
 
+/**
+ * Within the scope of an instance, this class will keep a #Mutex
+ * unlocked.
+ */
+class ScopeUnlock {
+	Mutex &mutex;
+
+public:
+	explicit ScopeUnlock(Mutex &_mutex):mutex(_mutex) {
+		mutex.unlock();
+	};
+
+	~ScopeUnlock() {
+		mutex.lock();
+	}
+
+	ScopeUnlock(const ScopeUnlock &other) = delete;
+	ScopeUnlock &operator=(const ScopeUnlock &other) = delete;
+};
+
 #endif