DRD regtest: try to make timed_mutex more reliable

On RHEL 7.6 ARM I see this with the lock returning false
but without the 11 second timeout. Try adding some sleeps.

diff --git a/drd/tests/timed_mutex.cpp b/drd/tests/timed_mutex.cpp
index b1bb61efa630416945caacf7da9d023571216a1c..fa7464ea5b1e53ba0a3f3dfd2b6926ea0d87e30f 100644 (file)
--- a/drd/tests/timed_mutex.cpp
+++ b/drd/tests/timed_mutex.cpp
@@ -12,16 +12,19 @@ void f()
     auto now=std::chrono::steady_clock::now();
     test_mutex.try_lock_until(now + std::chrono::seconds(11));
     --global;
+    std::this_thread::sleep_for(std::chrono::seconds(1));
     test_mutex.unlock();
 }
- 
+
+
 int main()
 {
     global = 0;
+    std::thread t(f);
+    std::this_thread::sleep_for(std::chrono::seconds(1));
     auto now=std::chrono::steady_clock::now();
     test_mutex.try_lock_until(now + std::chrono::seconds(11));
     ++global;
-    std::thread t(f);
     test_mutex.unlock();
     t.join();
     assert(global == 0);