Added unit test, and bug fixes.

flow/IThreadPool.h

@@ -115,12 +115,9 @@ template <class T>
 class ThreadReturnPromiseStream : NonCopyable {
 public:
 	ThreadReturnPromiseStream() {}
-	~ThreadReturnPromiseStream() {
-		if (!promiseStream.isValid())
-			sendError(broken_promise());
-	}
+	~ThreadReturnPromiseStream() {}
 
-	Future<T> getFuture() { // Call only on the originating thread!
+	FutureStream<T> getFuture() { // Call only on the originating thread!
 		return promiseStream.getFuture();
 	}
 

flow/IThreadPoolTest.actor.cpp

@@ -11,7 +11,11 @@
 
 void forceLinkIThreadPoolTests() {}
 
+static ThreadReturnPromiseStream<std::string> notifications;
+
 struct ThreadNameReceiver final : IThreadPoolReceiver {
+	ThreadNameReceiver(const bool stream_signal = false) : stream_signal(stream_signal) {}
+
 	void init() override {}
 
 	struct GetNameAction final : TypedAction<ThreadNameReceiver, GetNameAction> {
@@ -28,11 +32,19 @@ struct ThreadNameReceiver final : IThreadPoolReceiver {
 		if (err != 0) {
 			std::cout << "Get name failed with error code: " << err << std::endl;
 			a.name.sendError(platform_error());
+			if (stream_signal) {
+				notifications.sendError(platform_error());
+			}
 			return;
 		}
 		std::string s = name;
+		if (stream_signal) {
+			notifications.send(s);
+		}
 		a.name.send(std::move(s));
 	}
+
+	bool stream_signal; 
 };
 
 TEST_CASE("/flow/IThreadPool/NamedThread") {
@@ -60,6 +72,41 @@ TEST_CASE("/flow/IThreadPool/NamedThread") {
 	return Void();
 }
 
+TEST_CASE("/flow/IThreadPool/ThreadReturnPromiseStream") {
+	noUnseed = true;
+
+	state Reference<IThreadPool> pool = createGenericThreadPool();
+	pool->addThread(new ThreadNameReceiver(/*stream_signal=*/true), "thread-foo");
+
+	// Warning: this action is a little racy with the call to `pthread_setname_np`. In practice,
+	// ~nothing should depend on the thread name being set instantaneously. If this test ever
+	// flakes, we can make `startThread` in platform a little bit more complex to clearly order
+	// the actions.
+	state int num = 3;
+	for (int i = 0; i < num; ++i) {
+		auto* a = new ThreadNameReceiver::GetNameAction();
+		pool->post(a);
+	}
+
+	state FutureStream<std::string> futs = notifications.getFuture();
+
+	state int n = 0;
+	while (n < num) {
+		std::string name = waitNext(futs);
+		if (name != "thread-foo") {
+			std::cout << "Incorrect thread name: " << name << std::endl;
+			ASSERT(false);
+		}
+		++n;
+	}
+
+	ASSERT(n == num);
+
+	wait(pool->stop());
+
+	return Void();
+}
+
 #else
 void forceLinkIThreadPoolTests() {}
 #endif

flow/genericactors.actor.h

@@ -1269,7 +1269,7 @@ void tagAndForwardError(Promise<T>* pOutputPromise, Error value, Future<Void> si
 ACTOR template <class T>
 void tagAndForwardError(PromiseStream<T>* pOutput, Error value, Future<Void> signal) {
 	wait(signal);
-	pOutput.sendError(value);
+	pOutput->sendError(value);
 }
 
 ACTOR template <class T>

tests/WorkerTests.txt

@@ -4,4 +4,4 @@ useDB=false
 
     testName=UnitTests
     maxTestCases=0
-    testsMatching=/fdbserver/worker/
+    testsMatching=/flow/IThreadPool/