Add QThreadPool::stackSize

Allows setting the stack size for the thread pool
worker threads. Implemented using QThread::stackSize.

Task-number: QTBUG-2568
Change-Id: Ic7f3981289290685195bbaee977a23e0c3c49bf0
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 34 insertions, 0 deletions

diff --git a/tests/auto/corelib/thread/qthreadpool/tst_qthreadpool.cpp b/tests/auto/corelib/thread/qthreadpool/tst_qthreadpool.cpp
index 1dcd642023..782eed03e8 100644
--- a/tests/auto/corelib/thread/qthreadpool/tst_qthreadpool.cpp
+++ b/tests/auto/corelib/thread/qthreadpool/tst_qthreadpool.cpp
@@ -92,6 +92,7 @@ private slots:
     void tryTake();
     void waitForDoneTimeout();
     void destroyingWaitsForTasksToFinish();
+    void stackSize();
     void stressTest();
 
 private:
@@ -1136,6 +1137,39 @@ void tst_QThreadPool::destroyingWaitsForTasksToFinish()
     }
 }
 
+// Verify that QThreadPool::stackSize is used when creating
+// new threads. Note that this tests the Qt property only
+// since QThread::stackSize() does not reflect the actual
+// stack size used by the native thread.
+void tst_QThreadPool::stackSize()
+{
+    uint targetStackSize = 512 * 1024;
+    uint threadStackSize = 1; // impossible value
+
+    class StackSizeChecker : public QRunnable
+    {
+        public:
+        uint *stackSize;
+
+        StackSizeChecker(uint *stackSize)
+        :stackSize(stackSize)
+        {
+
+        }
+
+        void run()
+        {
+            *stackSize = QThread::currentThread()->stackSize();
+        }
+    };
+
+    QThreadPool threadPool;
+    threadPool.setStackSize(targetStackSize);
+    threadPool.start(new StackSizeChecker(&threadStackSize));
+    QVERIFY(threadPool.waitForDone(30000)); // 30s timeout
+    QCOMPARE(threadStackSize, targetStackSize);
+}
+
 void tst_QThreadPool::stressTest()
 {
     class Task : public QRunnable