Wait for eventhandler to shut down before exiting

R=sgjesse@google.com

Review URL: https://codereview.chromium.org//875403006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43504 260f80e4-7a28-3924-810f-c04153c831b5

runtime/bin/eventhandler.cc

@@ -4,7 +4,9 @@
 
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
+#include "bin/lockers.h"
 #include "bin/socket.h"
+#include "bin/thread.h"
 
 #include "include/dart_api.h"
 
@@ -57,19 +59,40 @@ void TimeoutQueue::UpdateTimeout(Dart_Port port, int64_t timeout) {
 
 
 static EventHandler* event_handler = NULL;
+static Monitor *shutdown_monitor = NULL;
 
 
 void EventHandler::Start() {
   ASSERT(event_handler == NULL);
+  shutdown_monitor = new Monitor();
   event_handler = new EventHandler();
   event_handler->delegate_.Start(event_handler);
 }
 
 
+void EventHandler::NotifyShutdownDone() {
+  MonitorLocker ml(shutdown_monitor);
+  ml.Notify();
+}
+
+
 void EventHandler::Stop() {
   if (event_handler == NULL) return;
-  event_handler->delegate_.Shutdown();
+
+  // Wait until it has stopped.
+  {
+    MonitorLocker ml(shutdown_monitor);
+
+    // Signal to event handler that we want it to stop.
+    event_handler->delegate_.Shutdown();
+    ml.Wait(Monitor::kNoTimeout);
+  }
+
+  // Cleanup
+  delete event_handler;
   event_handler = NULL;
+  delete shutdown_monitor;
+  shutdown_monitor = NULL;
 }
 
 

runtime/bin/eventhandler.h

@@ -119,6 +119,11 @@ class EventHandler {
     delegate_.SendData(id, dart_port, data);
   }
 
+  /**
+   * Signal to main thread that event handler is done.
+   */
+  void NotifyShutdownDone();
+
   /**
    * Start the event-handler.
    */

runtime/bin/eventhandler_android.cc

@@ -299,25 +299,27 @@ void EventHandlerImplementation::Poll(uword args) {
   ThreadSignalBlocker signal_blocker(SIGPROF);
   static const intptr_t kMaxEvents = 16;
   struct epoll_event events[kMaxEvents];
-  EventHandlerImplementation* handler =
-      reinterpret_cast<EventHandlerImplementation*>(args);
-  ASSERT(handler != NULL);
-  while (!handler->shutdown_) {
-    int64_t millis = handler->GetTimeout();
+  EventHandler* handler = reinterpret_cast<EventHandler*>(args);
+  EventHandlerImplementation* handler_impl = &handler->delegate_;
+  ASSERT(handler_impl != NULL);
+
+  while (!handler_impl->shutdown_) {
+    int64_t millis = handler_impl->GetTimeout();
     ASSERT(millis == kInfinityTimeout || millis >= 0);
     if (millis > kMaxInt32) millis = kMaxInt32;
     intptr_t result = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
-        epoll_wait(handler->epoll_fd_, events, kMaxEvents, millis));
+        epoll_wait(handler_impl->epoll_fd_, events, kMaxEvents, millis));
     ASSERT(EAGAIN == EWOULDBLOCK);
     if (result == -1) {
       if (errno != EWOULDBLOCK) {
         perror("Poll failed");
       }
     } else {
-      handler->HandleTimeout();
-      handler->HandleEvents(events, result);
+      handler_impl->HandleTimeout();
+      handler_impl->HandleEvents(events, result);
     }
   }
+  handler->NotifyShutdownDone();
 }
 
 

runtime/bin/eventhandler_linux.cc

@@ -315,6 +315,7 @@ void EventHandlerImplementation::Poll(uword args) {
   EventHandler* handler = reinterpret_cast<EventHandler*>(args);
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
+
   while (!handler_impl->shutdown_) {
     intptr_t result = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
         epoll_wait(handler_impl->epoll_fd_, events, kMaxEvents, -1));
@@ -327,13 +328,13 @@ void EventHandlerImplementation::Poll(uword args) {
       handler_impl->HandleEvents(events, result);
     }
   }
-  delete handler;
+  handler->NotifyShutdownDone();
 }
 
 
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result = Thread::Start(&EventHandlerImplementation::Poll,
-                                   reinterpret_cast<uword>(handler));
+                             reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }

runtime/bin/eventhandler_macos.cc

@@ -358,6 +358,7 @@ void EventHandlerImplementation::EventHandlerEntry(uword args) {
   EventHandler* handler = reinterpret_cast<EventHandler*>(args);
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
+
   while (!handler_impl->shutdown_) {
     int64_t millis = handler_impl->GetTimeout();
     ASSERT(millis == kInfinityTimeout || millis >= 0);
@@ -387,14 +388,14 @@ void EventHandlerImplementation::EventHandlerEntry(uword args) {
       handler_impl->HandleEvents(events, result);
     }
   }
-  delete handler;
+  handler->NotifyShutdownDone();
 }
 
 
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result =
       Thread::Start(&EventHandlerImplementation::EventHandlerEntry,
-                          reinterpret_cast<uword>(handler));
+                    reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }

runtime/bin/eventhandler_win.cc

@@ -1295,6 +1295,7 @@ void EventHandlerImplementation::EventHandlerEntry(uword args) {
   EventHandler* handler = reinterpret_cast<EventHandler*>(args);
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
+
   while (!handler_impl->shutdown_) {
     DWORD bytes;
     ULONG_PTR key;
@@ -1344,13 +1345,13 @@ void EventHandlerImplementation::EventHandlerEntry(uword args) {
       handler_impl->HandleIOCompletion(bytes, key, overlapped);
     }
   }
-  delete handler;
+  handler->NotifyShutdownDone();
 }
 
 
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result = Thread::Start(EventHandlerEntry,
-                                   reinterpret_cast<uword>(handler));
+                             reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }