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/*
 * Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#pragma once

#ifdef _WIN32
#include "w.h"
#else
#include <pthread.h>
#include <sched.h>
#include <sys/resource.h>
#endif

#include <boost/noncopyable.hpp>
#include "Exception.h"

namespace dcpp {

STANDARD_EXCEPTION(ThreadException);

class Thread : private boost::noncopyable
{
public:
#ifdef _WIN32
    enum Priority {
        IDLE = THREAD_PRIORITY_IDLE,
        LOW = THREAD_PRIORITY_BELOW_NORMAL,
        NORMAL = THREAD_PRIORITY_NORMAL,
        HIGH = THREAD_PRIORITY_ABOVE_NORMAL
    };

    Thread(): threadHandle(INVALID_HANDLE_VALUE), threadId(0){ }
    virtual ~Thread() {
        if(threadHandle != INVALID_HANDLE_VALUE)
            CloseHandle(threadHandle);
    }

    void start();
    void join() {
        if(threadHandle == INVALID_HANDLE_VALUE) {
            return;
        }

        WaitForSingleObject(threadHandle, INFINITE);
        CloseHandle(threadHandle);
        threadHandle = INVALID_HANDLE_VALUE;
    }

    void setThreadPriority(Priority p) { ::SetThreadPriority(threadHandle, p); }

    static void sleep(uint32_t millis) { ::Sleep(millis); }
    static void yield() { ::Sleep(0); }

#else

    enum Priority {
        IDLE = 1,
        LOW = 1,
        NORMAL = 0,
        HIGH = -1
    };
    Thread(): threadHandle(0) { }
    virtual ~Thread() {
        if(threadHandle != 0) {
            pthread_detach(threadHandle);
        }
    }
    void start();
    void join() {
        if (threadHandle) {
            pthread_join(threadHandle, 0);
            threadHandle = 0;
        }
    }

    void setThreadPriority(Priority p) {
#ifndef __HAIKU__
    setpriority(PRIO_PROCESS, 0, p);
#endif
    }
    static void sleep(uint32_t millis) { ::usleep(millis*1000); }
    static void yield() { ::sched_yield(); }

#endif

protected:
    void setThreadName(const char* const threadName) const;
    virtual int run() = 0;

#ifdef _WIN32
    HANDLE threadHandle;
    DWORD threadId;
    static DWORD WINAPI starter(void* p) {
        Thread* t = (Thread*)p;
        t->run();
        return 0;
    }
#else
    pthread_t threadHandle;
    static void* starter(void* p) {
        Thread* t = (Thread*)p;
        t->run();
        return NULL;
    }
#endif
};

} // namespace dcpp