Reduce run time of tst_QRegularExpression::threadSafety

This test was taking so much time that it regularly timed out on WinRT
and when running in qemu. Reduce it from around 40 to 7 seconds on a
powerful desktop.
Now it either runs for two full seconds for each test function or until
it has done 50 iterations.

Fixes: QTBUG-71405
Change-Id: If752c1e65d3b19009b883f64edc96d020df479d1
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/auto/corelib/tools/qregularexpression/tst_qregularexpression.cpp b/tests/auto/corelib/tools/qregularexpression/tst_qregularexpression.cpp
index 18098f16bf..c23ee3b0ba 100644
--- a/tests/auto/corelib/tools/qregularexpression/tst_qregularexpression.cpp
+++ b/tests/auto/corelib/tools/qregularexpression/tst_qregularexpression.cpp
@@ -2135,11 +2135,12 @@ void tst_QRegularExpression::threadSafety()
     QFETCH(QString, pattern);
     QFETCH(QString, subject);
 
+    QElapsedTimer time;
+    time.start();
     static const int THREAD_SAFETY_ITERATIONS = 50;
-
     const int threadCount = qMax(QThread::idealThreadCount(), 4);
 
-    for (int threadSafetyIteration = 0; threadSafetyIteration < THREAD_SAFETY_ITERATIONS; ++threadSafetyIteration) {
+    for (int threadSafetyIteration = 0; threadSafetyIteration < THREAD_SAFETY_ITERATIONS && time.elapsed() < 2000; ++threadSafetyIteration) {
         QRegularExpression re(pattern);
 
         QVector<MatcherThread *> threads;