r1

src/concurrentqueue.h

@@ -0,0 +1,51 @@
+//
+// Copyright (c) 2015-2018 The PIVX developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef Agrarian_CONCURRENTQUEUE_H
+#define Agrarian_CONCURRENTQUEUE_H
+
+
+#include <mutex>
+#include <condition_variable>
+#include <deque>
+
+template <typename T>
+class concurrentqueue
+{
+private:
+    std::mutex              mutex;
+    std::condition_variable condition;
+    std::deque<T>           queue;
+
+public:
+    void push(T const& value) {
+        {
+            std::unique_lock<std::mutex> lock(this->mutex);
+            queue.push_front(value);
+        }
+        this->condition.notify_one();
+    }
+    T pop() {
+        std::unique_lock<std::mutex> lock(this->mutex);
+        this->condition.wait(lock, [=]{ return !this->queue.empty(); });
+        T rc(std::move(this->queue.back()));
+        this->queue.pop_back();
+        return rc;
+    }
+
+    T popNotWait(){
+        std::unique_lock<std::mutex> lock(this->mutex);
+        T rc(std::move(this->queue.back()));
+        this->queue.pop_back();
+        return rc;
+    }
+
+    bool hasElements(){
+        std::unique_lock<std::mutex> lock(this->mutex);
+        return !queue.empty();
+    }
+};
+
+#endif //Agrarian_CONCURRENTQUEUE_H