watched_thread.h

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// Copyright (C) 2018-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef WATCHED_THREAD_H
#define WATCHED_THREAD_H
 
#include <util/watch_socket.h>
 
#include <boost/shared_ptr.hpp>
 
#include <functional>
#include <mutex>
#include <thread>
 
namespace isc {
namespace util {
 
typedef boost::shared_ptr<std::thread> ThreadPtr;
 
class WatchedThread {
public:
    enum WatchType {
        ERROR = 0,
        READY = 1,
        TERMINATE = 2
    };
 
    WatchedThread(){};
 
    virtual ~WatchedThread(){}
 
    int getWatchFd(WatchType watch_type);
 
    void markReady(WatchType watch_type);
 
    bool isReady(WatchType watch_type);
 
    void clearReady(WatchType watch_type);
 
    bool shouldTerminate();
 
    void start(const std::function<void()>& thread_main);
 
    bool isRunning() {
        return (thread_ != 0);
    }
 
    void stop();
 
    void setError(const std::string& error_msg);
 
    std::string getLastError();
 
private:
 
    void setErrorInternal(const std::string& error_msg);
 
    std::string last_error_;
 
    std::mutex mutex_;
 
    WatchSocket sockets_[TERMINATE + 1];
 
    ThreadPtr thread_ ;
};
 
typedef boost::shared_ptr<WatchedThread> WatchedThreadPtr;
 
}  // namespace util
}  // namespace isc
 
#endif // WATCHED_THREAD_H