| 1 | /* $Id: UIThreadPool.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBox Qt GUI - UIThreadPool class implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2013-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 | /* Qt includes: */
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| 29 | #include <QThread>
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| 30 |
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| 31 | /* GUI includes: */
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| 32 | #include "COMDefs.h"
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| 33 | #include "UIDefs.h"
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| 34 | #include "UITask.h"
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| 35 | #include "UIThreadPool.h"
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| 36 |
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| 37 | /* Other VBox includes: */
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| 38 | #include <iprt/assert.h>
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| 39 |
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| 40 |
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| 41 | /** QThread extension used as worker-thread.
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| 42 | * Capable of executing COM-related tasks. */
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| 43 | class UIThreadWorker : public QThread
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| 44 | {
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| 45 | Q_OBJECT;
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| 46 |
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| 47 | signals:
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| 48 |
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| 49 | /** Notifies listeners about @a pWorker finished. */
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| 50 | void sigFinished(UIThreadWorker *pWorker);
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| 51 |
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| 52 | public:
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| 53 |
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| 54 | /** Constructs worker-thread for parent worker-thread @a pPool.
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| 55 | * @param iIndex Brings worker-thread index within the worker-thread pool registry. */
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| 56 | UIThreadWorker(UIThreadPool *pPool, int iIndex);
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| 57 |
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| 58 | /** Returns worker-thread index within the worker-thread pool registry. */
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| 59 | int index() const { return m_iIndex; }
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| 60 |
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| 61 | /** Disables sigFinished signal, for optimizing worker-thread pool termination. */
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| 62 | void setNoFinishedSignal() { m_fNoFinishedSignal = true; }
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| 63 |
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| 64 | private:
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| 65 |
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| 66 | /** Contains the worker-thread body. */
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| 67 | void run();
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| 68 |
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| 69 | /** Holds the worker-thread pool reference. */
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| 70 | UIThreadPool *m_pPool;
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| 71 |
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| 72 | /** Holds the worker-thread index within the worker-thread pool registry. */
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| 73 | int m_iIndex;
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| 74 |
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| 75 | /** Holds whether sigFinished signal should be emitted or not. */
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| 76 | bool m_fNoFinishedSignal;
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| 77 | };
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| 78 |
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| 79 |
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| 80 | /*********************************************************************************************************************************
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| 81 | * Class UIThreadPool implementation. *
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| 82 | *********************************************************************************************************************************/
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| 83 |
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| 84 | UIThreadPool::UIThreadPool(ulong cMaxWorkers /* = 3 */, ulong cMsWorkerIdleTimeout /* = 5000 */)
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| 85 | : m_cMsIdleTimeout(cMsWorkerIdleTimeout)
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| 86 | , m_workers(cMaxWorkers)
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| 87 | , m_cWorkers(0)
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| 88 | , m_cIdleWorkers(0)
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| 89 | , m_fTerminating(false)
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| 90 | {
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| 91 | }
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| 92 |
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| 93 | UIThreadPool::~UIThreadPool()
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| 94 | {
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| 95 | /* Set termination status: */
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| 96 | setTerminating();
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| 97 |
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| 98 | /* Lock initially: */
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| 99 | m_everythingLocker.lock();
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| 100 |
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| 101 | /* Cleanup all the workers: */
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| 102 | for (int idxWorker = 0; idxWorker < m_workers.size(); ++idxWorker)
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| 103 | {
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| 104 | /* Acquire the worker: */
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| 105 | UIThreadWorker *pWorker = m_workers.at(idxWorker);
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| 106 | /* Remove it from the registry: */
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| 107 | m_workers[idxWorker] = 0;
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| 108 |
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| 109 | /* Clean up the worker, if there was one: */
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| 110 | if (pWorker)
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| 111 | {
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| 112 | /* Decrease the number of workers: */
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| 113 | --m_cWorkers;
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| 114 | /* Unlock temporary to let the worker finish: */
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| 115 | m_everythingLocker.unlock();
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| 116 | /* Wait for the worker to finish: */
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| 117 | pWorker->wait();
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| 118 | /* Lock again: */
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| 119 | m_everythingLocker.lock();
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| 120 | /* Delete the worker finally: */
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| 121 | delete pWorker;
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| 122 | }
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| 123 | }
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| 124 |
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| 125 | /* Cleanup all the tasks: */
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| 126 | qDeleteAll(m_pendingTasks);
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| 127 | qDeleteAll(m_executingTasks);
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| 128 | m_pendingTasks.clear();
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| 129 | m_executingTasks.clear();
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| 130 |
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| 131 | /* Unlock finally: */
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| 132 | m_everythingLocker.unlock();
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| 133 | }
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| 134 |
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| 135 | bool UIThreadPool::isTerminating() const
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| 136 | {
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| 137 | /* Lock initially: */
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| 138 | m_everythingLocker.lock();
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| 139 |
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| 140 | /* Acquire termination-flag: */
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| 141 | bool fTerminating = m_fTerminating;
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| 142 |
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| 143 | /* Unlock finally: */
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| 144 | m_everythingLocker.unlock();
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| 145 |
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| 146 | /* Return termination-flag: */
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| 147 | return fTerminating;
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| 148 | }
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| 149 |
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| 150 | void UIThreadPool::setTerminating()
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| 151 | {
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| 152 | /* Lock initially: */
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| 153 | m_everythingLocker.lock();
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| 154 |
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| 155 | /* Assign termination-flag: */
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| 156 | m_fTerminating = true;
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| 157 |
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| 158 | /* Tell all threads to NOT queue any termination signals: */
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| 159 | for (int idxWorker = 0; idxWorker < m_workers.size(); ++idxWorker)
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| 160 | {
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| 161 | UIThreadWorker *pWorker = m_workers.at(idxWorker);
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| 162 | if (pWorker)
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| 163 | pWorker->setNoFinishedSignal();
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| 164 | }
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| 165 |
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| 166 | /* Wake up all idle worker threads: */
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| 167 | m_taskCondition.wakeAll();
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| 168 |
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| 169 | /* Unlock finally: */
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| 170 | m_everythingLocker.unlock();
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| 171 | }
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| 172 |
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| 173 | void UIThreadPool::enqueueTask(UITask *pTask)
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| 174 | {
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| 175 | /* Do nothing if terminating: */
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| 176 | AssertReturnVoid(!isTerminating());
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| 177 |
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| 178 | /* Prepare task: */
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| 179 | connect(pTask, &UITask::sigComplete,
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| 180 | this, &UIThreadPool::sltHandleTaskComplete, Qt::QueuedConnection);
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| 181 |
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| 182 | /* Lock initially: */
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| 183 | m_everythingLocker.lock();
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| 184 |
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| 185 | /* Put the task into the queue: */
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| 186 | m_pendingTasks.enqueue(pTask);
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| 187 |
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| 188 | /* Wake up an idle worker if we got one: */
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| 189 | if (m_cIdleWorkers > 0)
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| 190 | {
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| 191 | m_taskCondition.wakeOne();
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| 192 | }
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| 193 | /* No idle worker threads, should we create a new one? */
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| 194 | else if (m_cWorkers < m_workers.size())
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| 195 | {
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| 196 | /* Find free slot: */
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| 197 | int idxFirstUnused = m_workers.size();
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| 198 | while (idxFirstUnused-- > 0)
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| 199 | if (m_workers.at(idxFirstUnused) == 0)
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| 200 | {
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| 201 | /* Prepare the new worker: */
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| 202 | UIThreadWorker *pWorker = new UIThreadWorker(this, idxFirstUnused);
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| 203 | connect(pWorker, &UIThreadWorker::sigFinished,
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| 204 | this, &UIThreadPool::sltHandleWorkerFinished, Qt::QueuedConnection);
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| 205 | m_workers[idxFirstUnused] = pWorker;
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| 206 | ++m_cWorkers;
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| 207 |
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| 208 | /* And start it: */
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| 209 | pWorker->start();
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| 210 | break;
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| 211 | }
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| 212 | }
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| 213 | /* else: wait for some worker to complete
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| 214 | * whatever it's busy with and jump to it. */
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| 215 |
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| 216 | /* Unlock finally: */
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| 217 | m_everythingLocker.unlock();
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| 218 | }
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| 219 |
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| 220 | UITask *UIThreadPool::dequeueTask(UIThreadWorker *pWorker)
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| 221 | {
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| 222 | /* Lock initially: */
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| 223 | m_everythingLocker.lock();
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| 224 |
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| 225 | /* Dequeue a task, watching out for terminations.
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| 226 | * For optimal efficiency in enqueueTask() we keep count of idle threads.
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| 227 | * If the wait times out, we'll return 0 and terminate the thread. */
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| 228 | bool fIdleTimedOut = false;
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| 229 | while (!m_fTerminating)
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| 230 | {
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| 231 | /* Make sure that worker has proper index: */
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| 232 | Assert(m_workers.at(pWorker->index()) == pWorker);
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| 233 |
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| 234 | /* Dequeue task if there is one: */
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| 235 | if (!m_pendingTasks.isEmpty())
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| 236 | {
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| 237 | UITask *pTask = m_pendingTasks.dequeue();
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| 238 | if (pTask)
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| 239 | {
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| 240 | /* Put into the set of executing tasks: */
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| 241 | m_executingTasks << pTask;
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| 242 |
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| 243 | /* Unlock finally: */
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| 244 | m_everythingLocker.unlock();
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| 245 |
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| 246 | /* Return dequeued task: */
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| 247 | return pTask;
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| 248 | }
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| 249 | }
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| 250 |
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| 251 | /* If we timed out already, then quit the worker thread. To prevent a
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| 252 | * race between enqueueTask and the queue removal of the thread from
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| 253 | * the workers vector, we remove it here already. (This does not apply
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| 254 | * to the termination scenario.) */
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| 255 | if (fIdleTimedOut)
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| 256 | {
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| 257 | m_workers[pWorker->index()] = 0;
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| 258 | --m_cWorkers;
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| 259 | break;
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| 260 | }
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| 261 |
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| 262 | /* Wait for a task or timeout: */
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| 263 | ++m_cIdleWorkers;
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| 264 | fIdleTimedOut = !m_taskCondition.wait(&m_everythingLocker, m_cMsIdleTimeout);
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| 265 | --m_cIdleWorkers;
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| 266 | }
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| 267 |
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| 268 | /* Unlock finally: */
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| 269 | m_everythingLocker.unlock();
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| 270 |
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| 271 | /* Return 0 by default: */
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| 272 | return 0;
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| 273 | }
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| 274 |
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| 275 | void UIThreadPool::sltHandleTaskComplete(UITask *pTask)
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| 276 | {
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| 277 | /* Skip on termination: */
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| 278 | if (isTerminating())
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| 279 | return;
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| 280 |
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| 281 | /* Notify listeners: */
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| 282 | emit sigTaskComplete(pTask);
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| 283 |
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| 284 | /* Lock initially: */
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| 285 | m_everythingLocker.lock();
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| 286 |
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| 287 | /* Delete task finally: */
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| 288 | if ( !m_executingTasks.contains(pTask)
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| 289 | || !m_executingTasks.remove(pTask))
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| 290 | AssertMsgFailed(("Unable to find or remove complete task!"));
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| 291 | delete pTask;
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| 292 |
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| 293 | /* Unlock finally: */
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| 294 | m_everythingLocker.unlock();
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| 295 | }
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| 296 |
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| 297 | void UIThreadPool::sltHandleWorkerFinished(UIThreadWorker *pWorker)
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| 298 | {
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| 299 | /* Wait for the thread to finish completely, then delete the thread
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| 300 | * object. We have already removed the thread from the workers vector.
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| 301 | * Note! We don't want to use 'this' here, in case it's invalid. */
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| 302 | pWorker->wait();
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| 303 | delete pWorker;
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| 304 | }
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| 305 |
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| 306 |
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| 307 | /*********************************************************************************************************************************
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| 308 | * Class UIThreadWorker implementation. *
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| 309 | *********************************************************************************************************************************/
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| 310 |
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| 311 | UIThreadWorker::UIThreadWorker(UIThreadPool *pPool, int iIndex)
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| 312 | : m_pPool(pPool)
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| 313 | , m_iIndex(iIndex)
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| 314 | , m_fNoFinishedSignal(false)
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| 315 | {
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| 316 | }
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| 317 |
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| 318 | void UIThreadWorker::run()
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| 319 | {
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| 320 | /* Initialize COM: */
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| 321 | COMBase::InitializeCOM(false);
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| 322 |
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| 323 | /* Try get a task from the pool queue: */
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| 324 | while (UITask *pTask = m_pPool->dequeueTask(this))
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| 325 | {
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| 326 | /* Process the task if we are not terminating.
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| 327 | * Please take into account tasks are cleared by the UIThreadPool
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| 328 | * after all listeners notified about task is complete and handled it. */
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| 329 | if (!m_pPool->isTerminating())
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| 330 | pTask->start();
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| 331 | }
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| 332 |
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| 333 | /* Cleanup COM: */
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| 334 | COMBase::CleanupCOM();
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| 335 |
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| 336 | /* Queue a signal for the pool to do thread cleanup, unless the pool is
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| 337 | already terminating and doesn't need the signal. */
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| 338 | if (!m_fNoFinishedSignal)
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| 339 | emit sigFinished(this);
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| 340 | }
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| 341 |
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| 342 |
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| 343 | #include "UIThreadPool.moc"
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