1 files changed, 193 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_thread_qmutex.cpp b/src/corelib/doc/snippets/code/src_corelib_thread_qmutex.cpp
new file mode 100644
index 0000000000..f5fbeb8419
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+++ b/src/corelib/doc/snippets/code/src_corelib_thread_qmutex.cpp
@@ -0,0 +1,193 @@
+/****************************************************************************
+**
+** 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]
+int number = 6;
+
+void method1()
+{
+    number *= 5;
+    number /= 4;
+}
+
+void 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]
+QMutex mutex;
+int number = 6;
+
+void method1()
+{
+    mutex.lock();
+    number *= 5;
+    number /= 4;
+    mutex.unlock();
+}
+
+void method2()
+{
+    mutex.lock();
+    number *= 3;
+    number /= 2;
+    mutex.unlock();
+}
+//! [3]
+
+
+//! [4]
+int complexFunction(int flag)
+{
+    mutex.lock();
+
+    int retVal = 0;
+
+    switch (flag) {
+    case 0:
+    case 1:
+        retVal = moreComplexFunction(flag);
+        break;
+    case 2:
+        {
+            int status = anotherFunction();
+            if (status < 0) {
+                mutex.unlock();
+                return -2;
+            }
+            retVal = status + flag;
+        }
+        break;
+    default:
+        if (flag > 10) {
+            mutex.unlock();
+            return -1;
+        }
+        break;
+    }
+
+    mutex.unlock();
+    return retVal;
+}
+//! [4]
+
+
+//! [5]
+int complexFunction(int flag)
+{
+    QMutexLocker locker(&mutex);
+
+    int retVal = 0;
+
+    switch (flag) {
+    case 0:
+    case 1:
+        return moreComplexFunction(flag);
+    case 2:
+        {
+            int status = anotherFunction();
+            if (status < 0)
+                return -2;
+            retVal = status + flag;
+        }
+        break;
+    default:
+        if (flag > 10)
+            return -1;
+        break;
+    }
+
+    return retVal;
+}
+//! [5]
+
+
+//! [6]
+class SignalWaiter
+{
+private:
+    QMutexLocker locker;
+
+public:
+    SignalWaiter(QMutex *mutex)
+        : locker(mutex)
+    {
+    }
+
+    void waitForSignal()
+    {
+        ...
+        while (!signalled)
+            waitCondition.wait(locker.mutex());
+        ...
+    }
+};
+//! [6]