1 files changed, 153 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_corelib_thread_qmutex.cpp b/doc/src/snippets/code/src_corelib_thread_qmutex.cpp
new file mode 100644
index 0000000..e79bb35
--- /dev/null
+++ b/doc/src/snippets/code/src_corelib_thread_qmutex.cpp
@@ -0,0 +1,153 @@
+//! [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:
+        mutex.unlock();
+        return moreComplexFunction(flag);
+    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]