forked from cawka/ndn.cxx
diff --git a/executor/executor.h b/executor/executor.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Alexander Afanasyev
+ *                     Zhenkai Zhu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef EXECUTOR_H
+#define EXECUTOR_H
+
+#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/thread/condition_variable.hpp>
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/locks.hpp>
+#include <boost/thread/thread.hpp>
+#include <deque>
+
+/* A very simple executor to execute submitted tasks immediately or
+ * in the future (depending on whether there is idle thread)
+ * A fixed number of threads are created for executing tasks;
+ * The policy is FIFO
+ * No cancellation of submitted tasks
+ */
+
+class Executor
+{
+public:
+  typedef boost::function<void ()> Job;
+
+  Executor(int poolSize);
+  ~Executor();
+
+  // execute the job immediately or sometime in the future
+  void
+  execute(const Job &job);
+
+  int
+  poolSize();
+
+// only for test
+  int
+  jobQueueSize();
+
+  void
+  start ();
+
+  void
+  shutdown ();
+
+private:
+  void
+  run();
+
+  Job
+  waitForJob();
+
+private:
+  typedef std::deque<Job> JobQueue;
+  typedef boost::mutex Mutex;
+  typedef boost::unique_lock<Mutex> Lock;
+  typedef boost::condition_variable Cond;
+  typedef boost::thread Thread;
+  typedef boost::thread_group ThreadGroup;
+  JobQueue m_queue;
+  Mutex m_mutex;
+  Cond m_cond;
+  ThreadGroup m_group;
+
+  volatile bool m_needStop;
+  int m_poolSize;
+};
+
+typedef boost::shared_ptr<Executor> ExecutorPtr;
+#endif // EXECUTOR_H