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| ** |
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| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ****************************************************************************/ |
| |
| #ifndef QTHREADPOOL_P_H |
| #define QTHREADPOOL_P_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| // |
| |
| #include "QtCore/qmutex.h" |
| #include "QtCore/qthread.h" |
| #include "QtCore/qwaitcondition.h" |
| #include "QtCore/qset.h" |
| #include "QtCore/qqueue.h" |
| #include "private/qobject_p.h" |
| |
| QT_REQUIRE_CONFIG(thread); |
| |
| QT_BEGIN_NAMESPACE |
| |
| class QDeadlineTimer; |
| |
| class QueuePage { |
| public: |
| enum { |
| MaxPageSize = 256 |
| }; |
| |
| QueuePage(QRunnable *runnable, int pri) |
| : m_priority(pri) |
| { |
| push(runnable); |
| } |
| |
| bool isFull() { |
| return m_lastIndex >= MaxPageSize - 1; |
| } |
| |
| bool isFinished() { |
| return m_firstIndex > m_lastIndex; |
| } |
| |
| void push(QRunnable *runnable) { |
| Q_ASSERT(runnable != nullptr); |
| Q_ASSERT(!isFull()); |
| m_lastIndex += 1; |
| m_entries[m_lastIndex] = runnable; |
| } |
| |
| void skipToNextOrEnd() { |
| while (!isFinished() && m_entries[m_firstIndex] == nullptr) { |
| m_firstIndex += 1; |
| } |
| } |
| |
| QRunnable *first() { |
| Q_ASSERT(!isFinished()); |
| QRunnable *runnable = m_entries[m_firstIndex]; |
| Q_ASSERT(runnable); |
| return runnable; |
| } |
| |
| QRunnable *pop() { |
| Q_ASSERT(!isFinished()); |
| QRunnable *runnable = first(); |
| Q_ASSERT(runnable); |
| |
| // clear the entry although this should not be necessary |
| m_entries[m_firstIndex] = nullptr; |
| m_firstIndex += 1; |
| |
| // make sure the next runnable returned by first() is not a nullptr |
| skipToNextOrEnd(); |
| |
| return runnable; |
| } |
| |
| bool tryTake(QRunnable *runnable) { |
| Q_ASSERT(!isFinished()); |
| for (int i = m_firstIndex; i <= m_lastIndex; i++) { |
| if (m_entries[i] == runnable) { |
| m_entries[i] = nullptr; |
| if (i == m_firstIndex) { |
| // make sure first() does not return a nullptr |
| skipToNextOrEnd(); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| int priority() const { |
| return m_priority; |
| } |
| |
| private: |
| int m_priority = 0; |
| int m_firstIndex = 0; |
| int m_lastIndex = -1; |
| QRunnable *m_entries[MaxPageSize]; |
| }; |
| |
| class QThreadPoolThread; |
| class Q_CORE_EXPORT QThreadPoolPrivate : public QObjectPrivate |
| { |
| Q_DECLARE_PUBLIC(QThreadPool) |
| friend class QThreadPoolThread; |
| |
| public: |
| QThreadPoolPrivate(); |
| |
| bool tryStart(QRunnable *task); |
| void enqueueTask(QRunnable *task, int priority = 0); |
| int activeThreadCount() const; |
| |
| void tryToStartMoreThreads(); |
| bool tooManyThreadsActive() const; |
| |
| void startThread(QRunnable *runnable = nullptr); |
| void reset(); |
| bool waitForDone(int msecs); |
| bool waitForDone(const QDeadlineTimer &timer); |
| void clear(); |
| void stealAndRunRunnable(QRunnable *runnable); |
| void deletePageIfFinished(QueuePage *page); |
| |
| mutable QMutex mutex; |
| QSet<QThreadPoolThread *> allThreads; |
| QQueue<QThreadPoolThread *> waitingThreads; |
| QQueue<QThreadPoolThread *> expiredThreads; |
| QVector<QueuePage*> queue; |
| QWaitCondition noActiveThreads; |
| |
| int expiryTimeout = 30000; |
| int maxThreadCount = QThread::idealThreadCount(); |
| int reservedThreads = 0; |
| int activeThreads = 0; |
| uint stackSize = 0; |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif |