diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_kernel_qsystemsemaphore.cpp')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_kernel_qsystemsemaphore.cpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_kernel_qsystemsemaphore.cpp b/src/corelib/doc/snippets/code/src_corelib_kernel_qsystemsemaphore.cpp new file mode 100644 index 0000000000..da6e9fca8e --- /dev/null +++ b/src/corelib/doc/snippets/code/src_corelib_kernel_qsystemsemaphore.cpp @@ -0,0 +1,61 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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] +QSystemSemaphore sem("market", 3, QSystemSemaphore::Create); + // resources available == 3 +sem.acquire(); // resources available == 2 +sem.acquire(); // resources available == 1 +sem.acquire(); // resources available == 0 +sem.release(); // resources available == 1 +sem.release(2); // resources available == 3 +//! [0] + + +//! [1] +QSystemSemaphore sem("market", 5, QSystemSemaphore::Create); +sem.acquire(5); // acquire all 5 resources +sem.release(5); // release the 5 resources +//! [1] + + +//! [2] +sem.release(10); // "create" 10 new resources +//! [2] |