src/common/WorkerThread.cpp

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2007 - 2020 Christian Schoenebeck                       *
 *   Copyright (C) 2007 - 2013 Grigor Iliev                                *
 *                                                                         *
 *   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 St, Fifth Floor, Boston,                *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#include "WorkerThread.h"

#include "Exception.h"

namespace LinuxSampler {

    WorkerThread::WorkerThread() : Thread(true, false, 0, -4) { }

    void WorkerThread::Execute(Runnable* pJob) {
        {
            LockGuard lock(mutex);
            queue.push_back(pJob);
        }
        StartThread(); // ensure thread is running
        conditionJobsLeft.Set(true); // wake up thread
    }

    // Entry point for the worker thread.
    int WorkerThread::Main() {

        #if DEBUG
        Thread::setNameOfCaller("LSWorker");
        #endif

        while (true) {

            TestCancel();

            // prevent worker thread from being cancelled
            // (e.g. to prevent deadlocks while holding mutex lock(s))
            pushCancelable(false);

            while (true) {
                Runnable* pJob;

                // grab a new job from the queue
                {
                    LockGuard lock(mutex);
                    if (queue.empty()) break;

                    pJob = queue.front();
                    queue.pop_front();
                }

                try {
                    pJob->Run();
                } catch (Exception e) {
                    e.PrintMessage();
                } catch (...) {
                    std::cerr << "WorkerThread: an exception occured, could not finish the job";
                    std::cerr << std::endl << std::flush;
                }

                delete pJob;
            }

            // now allow worker thread being cancelled again
            // (since all mutexes are now unlocked)
            popCancelable();

            // nothing left to do, sleep until new jobs arrive
            conditionJobsLeft.WaitIf(false);
            // reset flag
            conditionJobsLeft.Set(false);
            // unlock condition object so it can be turned again by other thread
            conditionJobsLeft.Unlock();
        }
        return 0;
    }

} // namespace LinuxSampler
1	iliev	1200	/***************************************************************************
2			* *
3	schoenebeck	3766	* Copyright (C) 2007 - 2020 Christian Schoenebeck *
4			* Copyright (C) 2007 - 2013 Grigor Iliev *
5	iliev	1200	* *
6			* This program is free software; you can redistribute it and/or modify *
7			* it under the terms of the GNU General Public License as published by *
8			* the Free Software Foundation; either version 2 of the License, or *
9			* (at your option) any later version. *
10			* *
11			* This program is distributed in the hope that it will be useful, *
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
14			* GNU General Public License for more details. *
15			* *
16			* You should have received a copy of the GNU General Public License *
17			* along with this program; if not, write to the Free Software *
18			* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
19			* MA 02110-1301 USA *
20			***************************************************************************/
21
22			#include "WorkerThread.h"
23
24			#include "Exception.h"
25
26			namespace LinuxSampler {
27
28			WorkerThread::WorkerThread() : Thread(true, false, 0, -4) { }
29
30			void WorkerThread::Execute(Runnable* pJob) {
31	persson	2427	{
32			LockGuard lock(mutex);
33			queue.push_back(pJob);
34			}
35	iliev	1200	StartThread(); // ensure thread is running
36			conditionJobsLeft.Set(true); // wake up thread
37			}
38
39			// Entry point for the worker thread.
40			int WorkerThread::Main() {
41	schoenebeck	3766
42			#if DEBUG
43			Thread::setNameOfCaller("LSWorker");
44			#endif
45
46	iliev	1200	while (true) {
47	nagata	1649
48	persson	2427	TestCancel();
49	schoenebeck	3766
50			// prevent worker thread from being cancelled
51			// (e.g. to prevent deadlocks while holding mutex lock(s))
52			pushCancelable(false);
53
54	persson	2427	while (true) {
55	iliev	1200	Runnable* pJob;
56
57			// grab a new job from the queue
58	persson	2427	{
59			LockGuard lock(mutex);
60			if (queue.empty()) break;
61	iliev	1200
62	persson	2427	pJob = queue.front();
63			queue.pop_front();
64			}
65
66	iliev	1200	try {
67			pJob->Run();
68			} catch (Exception e) {
69			e.PrintMessage();
70			} catch (...) {
71			std::cerr << "WorkerThread: an exception occured, could not finish the job";
72			std::cerr << std::endl << std::flush;
73			}
74
75			delete pJob;
76			}
77
78	schoenebeck	3766	// now allow worker thread being cancelled again
79			// (since all mutexes are now unlocked)
80			popCancelable();
81
82	iliev	1200	// nothing left to do, sleep until new jobs arrive
83			conditionJobsLeft.WaitIf(false);
84			// reset flag
85			conditionJobsLeft.Set(false);
86			// unlock condition object so it can be turned again by other thread
87			conditionJobsLeft.Unlock();
88			}
89	persson	1895	return 0;
90	iliev	1200	}
91
92			} // namespace LinuxSampler