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Diffstat (limited to 'sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_corelib_thread_qmutex.cpp')
-rw-r--r-- | sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_corelib_thread_qmutex.cpp | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_corelib_thread_qmutex.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_corelib_thread_qmutex.cpp new file mode 100644 index 000000000..b83164d56 --- /dev/null +++ b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_corelib_thread_qmutex.cpp @@ -0,0 +1,165 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the documentation of PySide2. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +number = 6 + +def method1(): + number *= 5 + number /= 4 + +def method2(): + number *= 3 + number /= 2 +//! [0] + + +//! [1] +# method1() +number *= 5 # number is now 30 +number /= 4 # number is now 7 + +# method2() +number *= 3 # number is now 21 +number /= 2 # number is now 10 +//! [1] + + +//! [2] +# Thread 1 calls method1() +number *= 5 # number is now 30 + +# Thread 2 calls method2(). +# +# Most likely Thread 1 has been put to sleep by the operating +# system to allow Thread 2 to run. +number *= 3 # number is now 90 +number /= 2 # number is now 45 + +# Thread 1 finishes executing. +number /= 4 # number is now 11, instead of 10 +//! [2] + + +//! [3] +mutex = QMutex() +number = 6 + +def method1(): + mutex.lock() + number *= 5 + number /= 4 + mutex.unlock() + +def method2(): + mutex.lock() + number *= 3 + number /= 2 + mutex.unlock() +//! [3] + + +//! [4] +def complexFunction(flag): + mutex.lock() + + retVal = 0 + + if flag == 0 or flag == 1: + mutex.unlock() + return moreComplexFunction(flag) + elif flag == 2: + status = anotherFunction() + if status < 0: + mutex.unlock() + return -2 + retVal = status + flag + else: + if flag > 10: + mutex.unlock() + return -1 + + mutex.unlock() + return retVal +//! [4] + + +//! [5] +def complexFunction(flag): + locker = QMutexLocker(mutex) + + retVal = 0 + + if flag == 0 or flag == 1: + return moreComplexFunction(flag) + elif flag == 2: + status = anotherFunction() + if status < 0: + return -2 + retVal = status + flag + else: + if flag > 10: + return -1 + + return retVal +//! [5] + + +//! [6] +class SignalWaiter: + def __init__(mutex): + self.locker = mutex + + def waitForSignal(): + # ... + while not signalled: + waitCondition.wait(self.locker.mutex()) + # ... +//! [6] |