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+// Copyright (c) 2015 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_REVERSELOCK_H
+#define BITCOIN_REVERSELOCK_H
+
+/**
+ * An RAII-style reverse lock. Unlocks on construction and locks on destruction.
+ */
+template<typename Lock>
+class reverse_lock
+{
+public:
+
+ explicit reverse_lock(Lock& lock) : lock(lock) {
+ lock.unlock();
+ }
+
+ ~reverse_lock() {
+ lock.lock();
+ }
+
+private:
+ reverse_lock(reverse_lock const&);
+ reverse_lock& operator=(reverse_lock const&);
+
+ Lock& lock;
+};
+
+#endif // BITCOIN_REVERSELOCK_H