LCOV - code coverage report
Current view: top level - usr/include/x86_64-linux-gnu/qt5/QtCore - qmutex.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 16 16 100.0 %
Date: 2016-09-12 13:07:23 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /****************************************************************************
       2             : **
       3             : ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
       4             : ** Contact: http://www.qt-project.org/legal
       5             : **
       6             : ** This file is part of the QtCore module of the Qt Toolkit.
       7             : **
       8             : ** $QT_BEGIN_LICENSE:LGPL$
       9             : ** Commercial License Usage
      10             : ** Licensees holding valid commercial Qt licenses may use this file in
      11             : ** accordance with the commercial license agreement provided with the
      12             : ** Software or, alternatively, in accordance with the terms contained in
      13             : ** a written agreement between you and Digia.  For licensing terms and
      14             : ** conditions see http://qt.digia.com/licensing.  For further information
      15             : ** use the contact form at http://qt.digia.com/contact-us.
      16             : **
      17             : ** GNU Lesser General Public License Usage
      18             : ** Alternatively, this file may be used under the terms of the GNU Lesser
      19             : ** General Public License version 2.1 as published by the Free Software
      20             : ** Foundation and appearing in the file LICENSE.LGPL included in the
      21             : ** packaging of this file.  Please review the following information to
      22             : ** ensure the GNU Lesser General Public License version 2.1 requirements
      23             : ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
      24             : **
      25             : ** In addition, as a special exception, Digia gives you certain additional
      26             : ** rights.  These rights are described in the Digia Qt LGPL Exception
      27             : ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
      28             : **
      29             : ** GNU General Public License Usage
      30             : ** Alternatively, this file may be used under the terms of the GNU
      31             : ** General Public License version 3.0 as published by the Free Software
      32             : ** Foundation and appearing in the file LICENSE.GPL included in the
      33             : ** packaging of this file.  Please review the following information to
      34             : ** ensure the GNU General Public License version 3.0 requirements will be
      35             : ** met: http://www.gnu.org/copyleft/gpl.html.
      36             : **
      37             : **
      38             : ** $QT_END_LICENSE$
      39             : **
      40             : ****************************************************************************/
      41             : 
      42             : #ifndef QMUTEX_H
      43             : #define QMUTEX_H
      44             : 
      45             : #include <QtCore/qglobal.h>
      46             : #include <QtCore/qatomic.h>
      47             : #include <new>
      48             : 
      49             : QT_BEGIN_NAMESPACE
      50             : 
      51             : 
      52             : #if !defined(QT_NO_THREAD) && !defined(Q_QDOC)
      53             : 
      54             : #ifdef Q_OS_LINUX
      55             : # define QT_MUTEX_LOCK_NOEXCEPT Q_DECL_NOTHROW
      56             : #else
      57             : # define QT_MUTEX_LOCK_NOEXCEPT
      58             : #endif
      59             : 
      60             : class QMutexData;
      61             : 
      62             : class Q_CORE_EXPORT QBasicMutex
      63             : {
      64             : public:
      65             :     inline void lock() QT_MUTEX_LOCK_NOEXCEPT {
      66             :         if (!fastTryLock())
      67             :             lockInternal();
      68             :     }
      69             : 
      70             :     inline void unlock() Q_DECL_NOTHROW {
      71             :         Q_ASSERT(d_ptr.load()); //mutex must be locked
      72             :         if (!fastTryUnlock())
      73             :             unlockInternal();
      74             :     }
      75             : 
      76             :     bool tryLock() Q_DECL_NOTHROW {
      77             :         return fastTryLock();
      78             :     }
      79             : 
      80             :     bool isRecursive(); //### Qt6: mark const
      81             : 
      82             : private:
      83             :     inline bool fastTryLock() Q_DECL_NOTHROW {
      84             :         return d_ptr.testAndSetAcquire(0, dummyLocked());
      85             :     }
      86             :     inline bool fastTryUnlock() Q_DECL_NOTHROW {
      87             :         return d_ptr.testAndSetRelease(dummyLocked(), 0);
      88             :     }
      89             :     inline bool fastTryLock(QMutexData *&current) Q_DECL_NOTHROW {
      90             :         return d_ptr.testAndSetAcquire(0, dummyLocked(), current);
      91             :     }
      92             :     inline bool fastTryUnlock(QMutexData *&current) Q_DECL_NOTHROW {
      93             :         return d_ptr.testAndSetRelease(dummyLocked(), 0, current);
      94             :     }
      95             : 
      96             :     void lockInternal() QT_MUTEX_LOCK_NOEXCEPT;
      97             :     bool lockInternal(int timeout) QT_MUTEX_LOCK_NOEXCEPT;
      98             :     void unlockInternal() Q_DECL_NOTHROW;
      99             : 
     100             :     QBasicAtomicPointer<QMutexData> d_ptr;
     101             :     static inline QMutexData *dummyLocked() {
     102             :         return reinterpret_cast<QMutexData *>(quintptr(1));
     103             :     }
     104             : 
     105             :     friend class QMutex;
     106             :     friend class QMutexData;
     107             : };
     108             : 
     109             : class Q_CORE_EXPORT QMutex : public QBasicMutex {
     110             : public:
     111             :     enum RecursionMode { NonRecursive, Recursive };
     112             :     explicit QMutex(RecursionMode mode = NonRecursive);
     113             :     ~QMutex();
     114             : 
     115             :     void lock() QT_MUTEX_LOCK_NOEXCEPT;
     116             :     bool tryLock(int timeout = 0) QT_MUTEX_LOCK_NOEXCEPT;
     117             :     void unlock() Q_DECL_NOTHROW;
     118             : 
     119             :     using QBasicMutex::isRecursive;
     120             : 
     121             : private:
     122             :     Q_DISABLE_COPY(QMutex)
     123             :     friend class QMutexLocker;
     124             : };
     125             : 
     126             : class Q_CORE_EXPORT QMutexLocker
     127             : {
     128             : public:
     129          18 :     inline explicit QMutexLocker(QBasicMutex *m) QT_MUTEX_LOCK_NOEXCEPT
     130             :     {
     131          18 :         Q_ASSERT_X((reinterpret_cast<quintptr>(m) & quintptr(1u)) == quintptr(0),
     132          18 :                    "QMutexLocker", "QMutex pointer is misaligned");
     133          18 :         val = quintptr(m);
     134          18 :         if (Q_LIKELY(m)) {
     135             :             // call QMutex::lock() instead of QBasicMutex::lock()
     136          18 :             static_cast<QMutex *>(m)->lock();
     137          18 :             val |= 1;
     138             :         }
     139          18 :     }
     140          18 :     inline ~QMutexLocker() { unlock(); }
     141             : 
     142          18 :     inline void unlock() Q_DECL_NOTHROW
     143             :     {
     144          18 :         if ((val & quintptr(1u)) == quintptr(1u)) {
     145          18 :             val &= ~quintptr(1u);
     146          18 :             mutex()->unlock();
     147             :         }
     148          18 :     }
     149             : 
     150             :     inline void relock() QT_MUTEX_LOCK_NOEXCEPT
     151             :     {
     152             :         if (val) {
     153             :             if ((val & quintptr(1u)) == quintptr(0u)) {
     154             :                 mutex()->lock();
     155             :                 val |= quintptr(1u);
     156             :             }
     157             :         }
     158             :     }
     159             : 
     160             : #if defined(Q_CC_MSVC)
     161             : #pragma warning( push )
     162             : #pragma warning( disable : 4312 ) // ignoring the warning from /Wp64
     163             : #endif
     164             : 
     165          18 :     inline QMutex *mutex() const
     166             :     {
     167          18 :         return reinterpret_cast<QMutex *>(val & ~quintptr(1u));
     168             :     }
     169             : 
     170             : #if defined(Q_CC_MSVC)
     171             : #pragma warning( pop )
     172             : #endif
     173             : 
     174             : private:
     175             :     Q_DISABLE_COPY(QMutexLocker)
     176             : 
     177             :     quintptr val;
     178             : };
     179             : 
     180             : #else // QT_NO_THREAD or Q_QDOC
     181             : 
     182             : class Q_CORE_EXPORT QMutex
     183             : {
     184             : public:
     185             :     enum RecursionMode { NonRecursive, Recursive };
     186             : 
     187             :     inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }
     188             : 
     189             :     inline void lock() {}
     190             :     inline bool tryLock(int timeout = 0) { Q_UNUSED(timeout); return true; }
     191             :     inline void unlock() {}
     192             :     inline bool isRecursive() { return true; }
     193             : 
     194             : private:
     195             :     Q_DISABLE_COPY(QMutex)
     196             : };
     197             : 
     198             : class Q_CORE_EXPORT QMutexLocker
     199             : {
     200             : public:
     201             :     inline explicit QMutexLocker(QMutex *) {}
     202             :     inline ~QMutexLocker() {}
     203             : 
     204             :     inline void unlock() {}
     205             :     void relock() {}
     206             :     inline QMutex *mutex() const { return 0; }
     207             : 
     208             : private:
     209             :     Q_DISABLE_COPY(QMutexLocker)
     210             : };
     211             : 
     212             : typedef QMutex QBasicMutex;
     213             : 
     214             : #endif // QT_NO_THREAD or Q_QDOC
     215             : 
     216             : QT_END_NAMESPACE
     217             : 
     218             : #endif // QMUTEX_H

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