Try a workaround to prevent nested continuations

Author: karzhenkov

test/async_auto_reset_event_tests.cpp

@@ -91,8 +91,6 @@ TEST_CASE("multi-threaded")
 {
 	cppcoro::static_thread_pool tp{ 3 };
 
-	unsigned max_depth = 0;
-
 	auto run = [&]() -> cppcoro::task<>
 	{
 		cppcoro::async_auto_reset_event event;
@@ -105,12 +103,18 @@ TEST_CASE("multi-threaded")
 			co_await event;
 			++value;
 
-			thread_local unsigned depth = 0;
-			if (depth > max_depth) max_depth = depth;
+			thread_local volatile bool nested = false;
+
+			if (nested)
+			{
+				co_await tp.schedule();
+				assert(!nested);
+			}
+
+			nested = true;
+			cppcoro::scoped_lambda cleanup = [] { nested = false; };
 
-			depth += 1;
 			event.set();
-			depth -= 1;
 		};
 
 		auto startSignaller = [&]() -> cppcoro::task<>
@@ -143,8 +147,6 @@ TEST_CASE("multi-threaded")
 	}
 
 	cppcoro::sync_wait(cppcoro::when_all(std::move(tasks)));
-
-	CHECK_MESSAGE(max_depth == 0, "Nested continuations detected");
 }
 
 TEST_SUITE_END();