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/*************************************************************************** |
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* * |
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* Copyright (C) 2005 - 2022 Christian Schoenebeck * |
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* * |
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* This library is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This library is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this library; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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#include "InstrumentManagerThread.h" |
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#include "../common/global_private.h" |
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#include "EngineChannelFactory.h" |
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|
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// how often periodic jobs for external components shall be executed |
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// (every 200ms) |
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#define PERIODIC_JOBS_SEC 0 |
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#define PERIODIC_JOBS_NSEC (200 * 1000 * 1000) |
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namespace LinuxSampler { |
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InstrumentManagerThread::InstrumentManagerThread() : Thread(true, false, 0, -4) { |
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eventHandler.pThread = this; |
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} |
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InstrumentManagerThread::~InstrumentManagerThread() { |
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Thread::StopThread(); |
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} |
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/** |
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* @brief Order loading of a new instrument. |
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* |
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* The request will go into a queue waiting to be processed by the |
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* class internal task thread. This method will immediately return and |
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* the instrument will be loaded in the background. |
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* |
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* @param Filename - file name of the instrument |
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* @param uiInstrumentIndex - index of the instrument within the file |
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* @param pEngineChannel - engine channel on which the instrument should be loaded |
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*/ |
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void InstrumentManagerThread::StartNewLoad(String Filename, uint uiInstrumentIndex, EngineChannel* pEngineChannel) { |
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dmsg(1,("Scheduling '%s' (Index=%d) to be loaded in background (if not loaded yet).\n",Filename.c_str(),uiInstrumentIndex)); |
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|
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// the listener only needs to be registered once in the |
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// Sampler, but as we don't know if Sampler has been |
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// recreated, we simply remove and add every time |
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pEngineChannel->GetSampler()->RemoveChannelCountListener(&eventHandler); |
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pEngineChannel->GetSampler()->AddChannelCountListener(&eventHandler); |
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command_t cmd; |
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cmd.type = command_t::DIRECT_LOAD; |
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cmd.pEngineChannel = pEngineChannel; |
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cmd.instrumentId.Index = uiInstrumentIndex; |
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cmd.instrumentId.FileName = Filename; |
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{ |
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LockGuard lock(mutex); |
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queue.push_back(cmd); |
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} |
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StartThread(); // ensure thread is running |
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conditionJobsLeft.Set(true); // wake up thread |
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} |
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/** |
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* @brief Order changing the life-time strategy of an instrument. |
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* |
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* The request will go into a queue waiting to be processed by the |
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* class internal task thread. This method will immediately return and |
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* in case the instrument has to be loaded due to a mode change to |
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* PERSISTENT, it will be loaded in the background. |
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* |
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* @param pManager - InstrumentManager which manages the instrument |
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* @param ID - unique ID of the instrument |
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* @param Mode - life-time strategy to set for this instrument |
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*/ |
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void InstrumentManagerThread::StartSettingMode(InstrumentManager* pManager, const InstrumentManager::instrument_id_t& ID, InstrumentManager::mode_t Mode) { |
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command_t cmd; |
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cmd.type = command_t::INSTR_MODE; |
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cmd.pManager = pManager; |
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cmd.instrumentId = ID; |
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cmd.mode = Mode; |
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{ |
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LockGuard lock(mutex); |
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queue.push_back(cmd); |
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} |
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StartThread(); // ensure thread is running |
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conditionJobsLeft.Set(true); // wake up thread |
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} |
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// Entry point for the task thread. |
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int InstrumentManagerThread::Main() { |
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#if DEBUG |
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Thread::setNameOfCaller("InstrumentMngr"); |
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#endif |
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while (true) { |
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TestCancel(); |
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// prevent thread from being cancelled |
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// (e.g. to prevent deadlocks while holding mutex lock(s)) |
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pushCancelable(false); |
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while (true) { |
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command_t cmd; |
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// grab a new command from the queue |
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{ |
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LockGuard lock(mutex); |
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if (queue.empty()) break; |
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cmd = queue.front(); |
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queue.pop_front(); |
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if (cmd.type == command_t::DIRECT_LOAD) { |
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EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, false); |
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} |
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} |
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try { |
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switch (cmd.type) { |
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case command_t::DIRECT_LOAD: |
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cmd.pEngineChannel->PrepareLoadInstrument(cmd.instrumentId.FileName.c_str(), cmd.instrumentId.Index); |
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cmd.pEngineChannel->LoadInstrument(); |
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EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true); |
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break; |
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case command_t::INSTR_MODE: |
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cmd.pManager->SetMode(cmd.instrumentId, cmd.mode); |
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break; |
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default: |
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std::cerr << "InstrumentManagerThread: unknown command - BUG!\n" << std::flush; |
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} |
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} catch (Exception e) { |
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e.PrintMessage(); |
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if (cmd.type == command_t::DIRECT_LOAD) { |
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EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true); |
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} |
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} catch (...) { |
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std::cerr << "InstrumentManagerThread: some exception occured, could not finish task\n" << std::flush; |
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if (cmd.type == command_t::DIRECT_LOAD) { |
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EngineChannelFactory::SetDeleteEnabled(cmd.pEngineChannel, true); |
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} |
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} |
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} |
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// perform periodic, custom jobs on behalf of external components |
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{ |
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LockGuard lock(periodicJobsMutex); |
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for (ext_job_t job : periodicJobs) { |
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job.fn(); |
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} |
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} |
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// now allow thread being cancelled again |
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// (since all mutexes are now unlocked) |
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popCancelable(); |
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// nothing left to do, sleep until new jobs arrive |
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const bool timedOut = |
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(AnyPeriodicJobs()) ? |
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// do wait, but with a maximum timeout value |
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conditionJobsLeft.WaitIf(false, PERIODIC_JOBS_SEC, PERIODIC_JOBS_NSEC) : |
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// wait indefinitely |
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conditionJobsLeft.WaitIf(false); |
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// reset flag |
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if (!timedOut) { |
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conditionJobsLeft.Set(false); |
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// unlock condition object so it can be turned again by other thread |
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conditionJobsLeft.Unlock(); |
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} |
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} |
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return 0; |
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} |
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/** |
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* Schedule a job to be executed by instrument manager thread periodically. |
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* |
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* This method is intended to be used by external components to execute |
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* instrument files related tasks periodically. Currently this is hard |
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* coded to happen approximately every 200ms, however if the instrument |
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* manager thread is currently blocked by executing other tasks (e.g. |
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* loading some instrument) then this might also be significantly delayed |
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* accordingly. |
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* |
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* The scheduled task will continue to be executed indefinitely until |
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* @c RemovePeriodicJob() is called. |
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* |
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* Currently this method is only used by the SFZ engine for its auto |
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* reload feature (i.e. on modifications of .sfz files by external apps). |
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* |
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* @param name - arbitrary but unique ID for the task |
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* @param fn - actual callback for the task to be executed |
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*/ |
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void InstrumentManagerThread::AddPeriodicJob(String name, std::function<void()> fn) { |
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LockGuard lock(periodicJobsMutex); |
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RemovePeriodicJobWithoutLock(name); |
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periodicJobs.push_back({ |
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.name = name, |
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.fn = fn |
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}); |
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} |
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/** |
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* Unschedule a periodic task previously scheduled by @c AddPeriodicJob(). |
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* |
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* @param name - unique ID of the previously scheduled periodic task |
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*/ |
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void InstrumentManagerThread::RemovePeriodicJob(String name) { |
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LockGuard lock(periodicJobsMutex); |
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RemovePeriodicJobWithoutLock(name); |
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} |
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void InstrumentManagerThread::RemovePeriodicJobWithoutLock(String name) { |
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for (size_t i = 0; i < periodicJobs.size(); ++i) { |
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if (periodicJobs[i].name == name) { |
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periodicJobs.erase( periodicJobs.begin() + i ); |
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return; |
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} |
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} |
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} |
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bool InstrumentManagerThread::AnyPeriodicJobs() { |
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// would probably be OK without a lock, but strictly it would be undefined behaviour |
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LockGuard lock(periodicJobsMutex); |
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return !periodicJobs.empty(); |
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} |
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void InstrumentManagerThread::EventHandler::ChannelToBeRemoved(SamplerChannel* pChannel) { |
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/* |
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Removing from the queue an eventual scheduled loading of an instrument |
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to a sampler channel which is going to be removed. |
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*/ |
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LockGuard lock(pThread->mutex); |
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std::list<command_t>::iterator it; |
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for (it = pThread->queue.begin(); it != pThread->queue.end();){ |
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if ((*it).type != command_t::DIRECT_LOAD) { ++it; continue; } |
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if ((*it).pEngineChannel == pChannel->GetEngineChannel()) { |
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it = pThread->queue.erase(it); |
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// we don't break here because the same engine channel could |
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// occur more than once in the queue, so don't make optimizations |
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} else { |
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++it; |
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} |
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} |
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} |
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#if defined(__APPLE__) && !defined(__x86_64__) |
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int InstrumentManagerThread::StopThread() { |
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// This is a fix for Mac OS X 32 bit, where SignalStopThread |
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// doesn't wake up a thread waiting for a condition variable. |
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SignalStopThread(); // send stop signal, but don't wait |
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conditionJobsLeft.Set(true); // wake thread |
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return Thread::StopThread(); // then wait for it to cancel |
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} |
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#endif |
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#ifdef WIN32 |
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int InstrumentManagerThread::StopThread() { |
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int res = Thread::StopThread(); |
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conditionJobsLeft.Reset(); |
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return res; |
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} |
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#endif |
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} // namespace LinuxSampler |