Trigger the event loop semaphore at the right time

This should prevent the hidden window on Windows from getting spammed,
and also prevent qode from entering this weird "slow down" state.

Author: sedwards2009

qode/integration/node_integration.cc

@@ -63,9 +63,6 @@ void NodeIntegration::UvRunOnce() {
 
   // Deal with uv events.
   uv_run(uv_loop_, UV_RUN_NOWAIT);
-
-  // Tell the worker thread to continue polling.
-  uv_sem_post(&embed_sem_);
 }
 
 void NodeIntegration::CallNextTick() {
@@ -79,6 +76,8 @@ void NodeIntegration::ReleaseHandleRef() {
 void NodeIntegration::WakeupMainThread() {
   PostTask([this] {
     this->UvRunOnce();
+    // Tell the worker thread to continue polling.
+    uv_sem_post(&this->embed_sem_);
   });
 }
 
@@ -91,8 +90,6 @@ void NodeIntegration::EmbedThreadRunner(void *arg) {
   NodeIntegration* self = static_cast<NodeIntegration*>(arg);
 
   while (true) {
-    // Wait for the main loop to deal with events.
-    uv_sem_wait(&self->embed_sem_);
     if (self->embed_closed_)
       break;
 
@@ -113,6 +110,9 @@ void NodeIntegration::EmbedThreadRunner(void *arg) {
 
     // Deal with event in main thread.
     self->WakeupMainThread();
+
+    // Wait for the main loop to deal with events.
+    uv_sem_wait(&self->embed_sem_);
   }
 }
 

qode/integration/node_integration_win.cc

@@ -4,6 +4,7 @@
 
 #include "qode/integration/node_integration_win.h"
 #include "uv/src/uv-common.h"
+#include <stdio.h>
 
 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
 extern "C" IMAGE_DOS_HEADER __ImageBase;
@@ -70,7 +71,11 @@ void NodeIntegrationWin::PostTask(const std::function<void()>& task) {
   ::EnterCriticalSection(&lock_);
   tasks_[++task_id_] = task;
   ::LeaveCriticalSection(&lock_);
-  ::PostMessage(message_window_, WM_USER, task_id_, 0L);
+  BOOL result = ::PostMessage(message_window_, WM_USER, task_id_, 0L);
+  if (result == 0) {
+    int lastError = ::GetLastError();
+    fprintf(stderr, "Qode: PostMessage() failed! LastError=%d\n", lastError);
+  }
 }
 
 void NodeIntegrationWin::OnTask(int id) {