qt 6.5.1 original

examples/corelib/threads/waitconditions/CMakeLists.txt

@@ -0,0 +1,29 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(waitconditions LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/corelib/threads/waitconditions")
+
+find_package(Qt6 REQUIRED COMPONENTS Core)
+
+qt_standard_project_setup()
+
+qt_add_executable(waitconditions
+    waitconditions.cpp
+)
+
+target_link_libraries(waitconditions PRIVATE
+    Qt6::Core
+)
+
+install(TARGETS waitconditions
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/corelib/threads/waitconditions/waitconditions.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// Copyright (C) 2022 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QCoreApplication>
+#include <QMutex>
+#include <QMutexLocker>
+#include <QObject>
+#include <QRandomGenerator>
+#include <QThread>
+#include <QWaitCondition>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+//! [0]
+constexpr int DataSize = 100000;
+constexpr int BufferSize = 8192;
+
+QMutex mutex; // protects the buffer and the counter
+char buffer[BufferSize];
+int numUsedBytes;
+
+QWaitCondition bufferNotEmpty;
+QWaitCondition bufferNotFull;
+//! [0]
+
+//! [1]
+class Producer : public QThread
+//! [1] //! [2]
+{
+public:
+    explicit Producer(QObject *parent = nullptr)
+        : QThread(parent)
+    {
+    }
+
+private:
+    void run() override
+    {
+        for (int i = 0; i < DataSize; ++i) {
+            {
+                const QMutexLocker locker(&mutex);
+                while (numUsedBytes == BufferSize)
+                    bufferNotFull.wait(&mutex);
+            }
+
+            buffer[i % BufferSize] = "ACGT"[QRandomGenerator::global()->bounded(4)];
+
+            {
+                const QMutexLocker locker(&mutex);
+                ++numUsedBytes;
+                bufferNotEmpty.wakeAll();
+            }
+        }
+    }
+};
+//! [2]
+
+//! [3]
+class Consumer : public QThread
+//! [3] //! [4]
+{
+public:
+    explicit Consumer(QObject *parent = nullptr)
+        : QThread(parent)
+    {
+    }
+
+private:
+    void run() override
+    {
+        for (int i = 0; i < DataSize; ++i) {
+            {
+                const QMutexLocker locker(&mutex);
+                while (numUsedBytes == 0)
+                    bufferNotEmpty.wait(&mutex);
+            }
+
+            fprintf(stderr, "%c", buffer[i % BufferSize]);
+
+            {
+                const QMutexLocker locker(&mutex);
+                --numUsedBytes;
+                bufferNotFull.wakeAll();
+            }
+        }
+        fprintf(stderr, "\n");
+    }
+};
+//! [4]
+
+
+//! [5]
+int main(int argc, char *argv[])
+//! [5] //! [6]
+{
+    QCoreApplication app(argc, argv);
+    Producer producer;
+    Consumer consumer;
+    producer.start();
+    consumer.start();
+    producer.wait();
+    consumer.wait();
+    return 0;
+}
+//! [6]
+

examples/corelib/threads/waitconditions/waitconditions.pro

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+QT = core
+CONFIG -= moc
+CONFIG += cmdline
+
+SOURCES += waitconditions.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/corelib/threads/waitconditions
+INSTALLS += target