QSemaphore: add <chrono> overload of tryAcquire()

... and C++20 std::counting_semaphore API compatibility.

[ChangeLog][QtCore][QSemaphore] tryAcquire() now optionally takes a
<chrono> duration as timeout, not just int milliseconds.

[ChangeLog][QtCore][QSemaphore] Added try_acquire{,_for,_until}() for
C++20 std::counting_semaphore compatibility.

Change-Id: I34b6b4bf57a54745d4b97349903d090c4995338a
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 35 insertions, 1 deletions

diff --git a/tests/auto/corelib/thread/qsemaphore/tst_qsemaphore.cpp b/tests/auto/corelib/thread/qsemaphore/tst_qsemaphore.cpp
index 9f1512bc44..1d3f3d6776 100644
--- a/tests/auto/corelib/thread/qsemaphore/tst_qsemaphore.cpp
+++ b/tests/auto/corelib/thread/qsemaphore/tst_qsemaphore.cpp
@@ -32,6 +32,10 @@
 #include <qthread.h>
 #include <qsemaphore.h>
 
+#include <chrono>
+
+using namespace std::chrono_literals;
+
 class tst_QSemaphore : public QObject
 {
     Q_OBJECT
@@ -47,6 +51,7 @@ private slots:
     void tryAcquireWithTimeoutForever();
     void producerConsumer();
     void raii();
+    void stdCompat();
 };
 
 static QSemaphore *semaphore = nullptr;
@@ -500,7 +505,7 @@ public:
     void run() override;
 };
 
-static const int Timeout = 60 * 1000; // 1min
+static const auto Timeout = 1min;
 
 void Producer::run()
 {
@@ -599,5 +604,34 @@ void tst_QSemaphore::raii()
     QCOMPARE(sem.available(), 49);
 }
 
+void tst_QSemaphore::stdCompat()
+{
+    QSemaphore sem(1);
+
+    auto now = [] { return std::chrono::steady_clock::now(); };
+
+    QVERIFY(sem.try_acquire());
+    QCOMPARE(sem.available(), 0);
+    QVERIFY(!sem.try_acquire_for(10ms));
+    QCOMPARE(sem.available(), 0);
+    QVERIFY(!sem.try_acquire_until(now() + 10ms));
+    QCOMPARE(sem.available(), 0);
+
+    sem.release(2);
+
+    QVERIFY(sem.try_acquire());
+    QVERIFY(sem.try_acquire_for(5ms));
+    QCOMPARE(sem.available(), 0);
+    QVERIFY(!sem.try_acquire_until(now() + 5ms));
+    QCOMPARE(sem.available(), 0);
+
+    sem.release(3);
+
+    QVERIFY(sem.try_acquire());
+    QVERIFY(sem.try_acquire_for(5s));
+    QVERIFY(sem.try_acquire_until(now() + 5s));
+    QCOMPARE(sem.available(), 0);
+}
+
 QTEST_MAIN(tst_QSemaphore)
 #include "tst_qsemaphore.moc"