initial code repo

[stor4nfv.git] / src / ceph / src / msg / async / dpdk / queue.h

diff --git a/src/ceph/src/msg/async/dpdk/queue.h b/src/ceph/src/msg/async/dpdk/queue.h
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+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2014 Cloudius Systems, Ltd.
+ */
+
+#ifndef CEPH_MSG_DPDK_QUEUE_H_
+#define CEPH_MSG_DPDK_QUEUE_H_
+
+#include <queue>
+
+#include "circular_buffer.h"
+
+template <typename T>
+class queue {
+  std::queue<T, circular_buffer<T>> _q;
+  size_t _max;
+
+ public:
+  explicit queue(size_t size): _max(size) {}
+
+  // Push an item.
+  //
+  // Returns false if the queue was full and the item was not pushed.
+  bool push(T&& a);
+
+  // pops an item.
+  T pop();
+
+  // Consumes items from the queue, passing them to @func, until @func
+  // returns false or the queue it empty
+  //
+  // Returns false if func returned false.
+  template <typename Func>
+  bool consume(Func&& func);
+
+  // Returns true when the queue is empty.
+  bool empty() const;
+
+  // Returns true when the queue is full.
+  bool full() const;
+
+  size_t size() const { return _q.size(); }
+
+  // Destroy any items in the queue
+  void clear() {
+    while (!_q.empty()) {
+      _q.pop();
+    }
+  }
+};
+
+template <typename T>
+inline bool queue<T>::push(T&& data) {
+  if (_q.size() < _max) {
+    _q.push(std::move(data));
+    notify_not_empty();
+    return true;
+  } else {
+    return false;
+  }
+}
+
+template <typename T>
+inline T queue<T>::pop() {
+  T data = std::move(_q.front());
+  _q.pop();
+  return data;
+}
+
+template <typename T>
+inline bool queue<T>::empty() const {
+  return _q.empty();
+}
+
+template <typename T>
+inline bool queue<T>::full() const {
+  return _q.size() == _max;
+}
+
+#endif /* CEPH_MSG_DPDK_QUEUE_H_ */