src/engines/InstrumentManagerThread.cpp

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2005 - 2012 Christian Schoenebeck                       *
 *                                                                         *
 *   This library 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 library 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 library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "InstrumentManagerThread.h"

#include "../common/global_private.h"
#include "EngineChannelFactory.h"

#ifdef __APPLE__
#include <sys/utsname.h>
#endif

namespace LinuxSampler {

    InstrumentManagerThread::InstrumentManagerThread() : Thread(true, false, 0, -4) {
        eventHandler.pThread = this;
    }

    InstrumentManagerThread::~InstrumentManagerThread() {
    }

    /**
     * @brief Order loading of a new instrument.
     *
     * The request will go into a queue waiting to be processed by the
     * class internal task thread. This method will immediately return and
     * the instrument will be loaded in the background.
     *
     * @param Filename - file name of the instrument
     * @param uiInstrumentIndex - index of the instrument within the file
     * @param pEngineChannel - engine channel on which the instrument should be loaded
     */
    void InstrumentManagerThread::StartNewLoad(String Filename, uint uiInstrumentIndex, EngineChannel* pEngineChannel) {
        dmsg(1,("Scheduling '%s' (Index=%d) to be loaded in background (if not loaded yet).\n",Filename.c_str(),uiInstrumentIndex));

        // the listener only needs to be registered once in the
        // Sampler, but as we don't know if Sampler has been
        // recreated, we simply remove and add every time
        pEngineChannel->GetSampler()->RemoveChannelCountListener(&eventHandler);
        pEngineChannel->GetSampler()->AddChannelCountListener(&eventHandler);
        
        command_t cmd;
        cmd.type           = command_t::DIRECT_LOAD;
        cmd.pEngineChannel = pEngineChannel;
        cmd.instrumentId.Index = uiInstrumentIndex;
        cmd.instrumentId.FileName = Filename;

        mutex.Lock();
        queue.push_back(cmd);
        mutex.Unlock();

        StartThread(); // ensure thread is running
        conditionJobsLeft.Set(true); // wake up thread
    }

    /**
     * @brief Order changing the life-time strategy of an instrument.
     *
     * The request will go into a queue waiting to be processed by the
     * class internal task thread. This method will immediately return and
     * in case the instrument has to be loaded due to a mode change to
     * PERSISTENT, it will be loaded in the background.
     *
     * @param pManager - InstrumentManager which manages the instrument
     * @param ID       - unique ID of the instrument
     * @param Mode     - life-time strategy to set for this instrument
     */
    void InstrumentManagerThread::StartSettingMode(InstrumentManager* pManager, const InstrumentManager::instrument_id_t& ID, InstrumentManager::mode_t Mode) {
        command_t cmd;
        cmd.type         = command_t::INSTR_MODE;
        cmd.pManager     = pManager;
        cmd.instrumentId = ID;
        cmd.mode         = Mode;

        mutex.Lock();
        queue.push_back(cmd);
        mutex.Unlock();

        StartThread(); // ensure thread is running
        conditionJobsLeft.Set(true); // wake up thread
    }

    // Entry point for the task thread.
    int InstrumentManagerThread::Main() {
        while (true) {

            #if CONFIG_PTHREAD_TESTCANCEL
            TestCancel();
            #endif

            while (true) {
                command_t cmd;

                // grab a new command from the queue
                mutex.Lock();
                bool empty = queue.empty();
                if (!empty) {
                    cmd = queue.front();
                    queue.pop_front();

                    if (cmd.type == command_t::DIRECT_LOAD) {
                        EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, false);
                    }
                }
                mutex.Unlock();
                if (empty) break;

                try {
                    switch (cmd.type) {
                        case command_t::DIRECT_LOAD:
                            cmd.pEngineChannel->PrepareLoadInstrument(cmd.instrumentId.FileName.c_str(), cmd.instrumentId.Index);
                            cmd.pEngineChannel->LoadInstrument();
                            EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
                            break;
                        case command_t::INSTR_MODE:
                            cmd.pManager->SetMode(cmd.instrumentId, cmd.mode);
                            break;
                        default:
                            std::cerr << "InstrumentManagerThread: unknown command - BUG!\n" << std::flush;
                    }
                } catch (Exception e) {
                    e.PrintMessage();
                    if (cmd.type == command_t::DIRECT_LOAD) {
                        EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
                    }
                } catch (...) {
                    std::cerr << "InstrumentManagerThread: some exception occured, could not finish task\n" << std::flush;
                    if (cmd.type == command_t::DIRECT_LOAD) {
                        EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
                    }
                }
            }

            // 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;
    }

    void InstrumentManagerThread::EventHandler::ChannelToBeRemoved(SamplerChannel* pChannel) {
        /*
           Removing from the queue an eventual scheduled loading of an instrument
           to a sampler channel which is going to be removed.
        */
        pThread->mutex.Lock();
        std::list<command_t>::iterator it;
        for (it = pThread->queue.begin(); it != pThread->queue.end();){
            if ((*it).type != command_t::DIRECT_LOAD) { ++it; continue; }
            if ((*it).pEngineChannel == pChannel->GetEngineChannel()) {
                it = pThread->queue.erase(it);
                // we don't break here because the same engine channel could
                // occur more than once in the queue, so don't make optimizations
            } else {
                ++it;
            }
        } 
        pThread->mutex.Unlock();
    }

#ifdef __APPLE__
    int InstrumentManagerThread::StopThread() {
        utsname buf;
        int osVersion = uname(&buf) ? 0 : atoi(buf.release);

        // This is a fix for Mac OS X 10.6 and earlier, where
        // SignalStopThread doesn't wake up a thread waiting for a
        // condition variable.
        if (osVersion < 11) { // darwin 11 = OS X 10.7
            SignalStopThread(); // send stop signal, but don't wait
            conditionJobsLeft.Set(true); // wake thread
        }
        return Thread::StopThread(); // then wait for it to cancel
    }
#endif

#ifdef WIN32
    int InstrumentManagerThread::StopThread() {
        int res = Thread::StopThread();
        conditionJobsLeft.Reset();
        return res;
    }
#endif

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* Copyright (C) 2005 - 2012 Christian Schoenebeck *
4	* *
5	* This library is free software; you can redistribute it and/or modify *
6	* it under the terms of the GNU General Public License as published by *
7	* the Free Software Foundation; either version 2 of the License, or *
8	* (at your option) any later version. *
9	* *
10	* This library is distributed in the hope that it will be useful, *
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13	* GNU General Public License for more details. *
14	* *
15	* You should have received a copy of the GNU General Public License *
16	* along with this library; if not, write to the Free Software *
17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
18	* MA 02111-1307 USA *
19	***************************************************************************/
20
21	#include "InstrumentManagerThread.h"
22
23	#include "../common/global_private.h"
24	#include "EngineChannelFactory.h"
25
26	#ifdef __APPLE__
27	#include <sys/utsname.h>
28	#endif
29
30	namespace LinuxSampler {
31
32	InstrumentManagerThread::InstrumentManagerThread() : Thread(true, false, 0, -4) {
33	eventHandler.pThread = this;
34	}
35
36	InstrumentManagerThread::~InstrumentManagerThread() {
37	}
38
39	/**
40	* @brief Order loading of a new instrument.
41	*
42	* The request will go into a queue waiting to be processed by the
43	* class internal task thread. This method will immediately return and
44	* the instrument will be loaded in the background.
45	*
46	* @param Filename - file name of the instrument
47	* @param uiInstrumentIndex - index of the instrument within the file
48	* @param pEngineChannel - engine channel on which the instrument should be loaded
49	*/
50	void InstrumentManagerThread::StartNewLoad(String Filename, uint uiInstrumentIndex, EngineChannel* pEngineChannel) {
51	dmsg(1,("Scheduling '%s' (Index=%d) to be loaded in background (if not loaded yet).\n",Filename.c_str(),uiInstrumentIndex));
52
53	// the listener only needs to be registered once in the
54	// Sampler, but as we don't know if Sampler has been
55	// recreated, we simply remove and add every time
56	pEngineChannel->GetSampler()->RemoveChannelCountListener(&eventHandler);
57	pEngineChannel->GetSampler()->AddChannelCountListener(&eventHandler);
58
59	command_t cmd;
60	cmd.type = command_t::DIRECT_LOAD;
61	cmd.pEngineChannel = pEngineChannel;
62	cmd.instrumentId.Index = uiInstrumentIndex;
63	cmd.instrumentId.FileName = Filename;
64
65	mutex.Lock();
66	queue.push_back(cmd);
67	mutex.Unlock();
68
69	StartThread(); // ensure thread is running
70	conditionJobsLeft.Set(true); // wake up thread
71	}
72
73	/**
74	* @brief Order changing the life-time strategy of an instrument.
75	*
76	* The request will go into a queue waiting to be processed by the
77	* class internal task thread. This method will immediately return and
78	* in case the instrument has to be loaded due to a mode change to
79	* PERSISTENT, it will be loaded in the background.
80	*
81	* @param pManager - InstrumentManager which manages the instrument
82	* @param ID - unique ID of the instrument
83	* @param Mode - life-time strategy to set for this instrument
84	*/
85	void InstrumentManagerThread::StartSettingMode(InstrumentManager* pManager, const InstrumentManager::instrument_id_t& ID, InstrumentManager::mode_t Mode) {
86	command_t cmd;
87	cmd.type = command_t::INSTR_MODE;
88	cmd.pManager = pManager;
89	cmd.instrumentId = ID;
90	cmd.mode = Mode;
91
92	mutex.Lock();
93	queue.push_back(cmd);
94	mutex.Unlock();
95
96	StartThread(); // ensure thread is running
97	conditionJobsLeft.Set(true); // wake up thread
98	}
99
100	// Entry point for the task thread.
101	int InstrumentManagerThread::Main() {
102	while (true) {
103
104	#if CONFIG_PTHREAD_TESTCANCEL
105	TestCancel();
106	#endif
107
108	while (true) {
109	command_t cmd;
110
111	// grab a new command from the queue
112	mutex.Lock();
113	bool empty = queue.empty();
114	if (!empty) {
115	cmd = queue.front();
116	queue.pop_front();
117
118	if (cmd.type == command_t::DIRECT_LOAD) {
119	EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, false);
120	}
121	}
122	mutex.Unlock();
123	if (empty) break;
124
125	try {
126	switch (cmd.type) {
127	case command_t::DIRECT_LOAD:
128	cmd.pEngineChannel->PrepareLoadInstrument(cmd.instrumentId.FileName.c_str(), cmd.instrumentId.Index);
129	cmd.pEngineChannel->LoadInstrument();
130	EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
131	break;
132	case command_t::INSTR_MODE:
133	cmd.pManager->SetMode(cmd.instrumentId, cmd.mode);
134	break;
135	default:
136	std::cerr << "InstrumentManagerThread: unknown command - BUG!\n" << std::flush;
137	}
138	} catch (Exception e) {
139	e.PrintMessage();
140	if (cmd.type == command_t::DIRECT_LOAD) {
141	EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
142	}
143	} catch (...) {
144	std::cerr << "InstrumentManagerThread: some exception occured, could not finish task\n" << std::flush;
145	if (cmd.type == command_t::DIRECT_LOAD) {
146	EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true);
147	}
148	}
149	}
150
151	// nothing left to do, sleep until new jobs arrive
152	conditionJobsLeft.WaitIf(false);
153	// reset flag
154	conditionJobsLeft.Set(false);
155	// unlock condition object so it can be turned again by other thread
156	conditionJobsLeft.Unlock();
157	}
158	return 0;
159	}
160
161	void InstrumentManagerThread::EventHandler::ChannelToBeRemoved(SamplerChannel* pChannel) {
162	/*
163	Removing from the queue an eventual scheduled loading of an instrument
164	to a sampler channel which is going to be removed.
165	*/
166	pThread->mutex.Lock();
167	std::list<command_t>::iterator it;
168	for (it = pThread->queue.begin(); it != pThread->queue.end();){
169	if ((*it).type != command_t::DIRECT_LOAD) { ++it; continue; }
170	if ((*it).pEngineChannel == pChannel->GetEngineChannel()) {
171	it = pThread->queue.erase(it);
172	// we don't break here because the same engine channel could
173	// occur more than once in the queue, so don't make optimizations
174	} else {
175	++it;
176	}
177	}
178	pThread->mutex.Unlock();
179	}
180
181	#ifdef __APPLE__
182	int InstrumentManagerThread::StopThread() {
183	utsname buf;
184	int osVersion = uname(&buf) ? 0 : atoi(buf.release);
185
186	// This is a fix for Mac OS X 10.6 and earlier, where
187	// SignalStopThread doesn't wake up a thread waiting for a
188	// condition variable.
189	if (osVersion < 11) { // darwin 11 = OS X 10.7
190	SignalStopThread(); // send stop signal, but don't wait
191	conditionJobsLeft.Set(true); // wake thread
192	}
193	return Thread::StopThread(); // then wait for it to cancel
194	}
195	#endif
196
197	#ifdef WIN32
198	int InstrumentManagerThread::StopThread() {
199	int res = Thread::StopThread();
200	conditionJobsLeft.Reset();
201	return res;
202	}
203	#endif
204
205	} // namespace LinuxSampler