Do not block in SimpleThread::Start().

media/audio/win/audio_low_latency_output_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/win/audio_low_latency_output_win.h"
 
 #include <Functiondiscoverykeys_devpkey.h>
 
 #include <climits>
 
@@ skipping 263 matching lines @@
     }
   }
   num_written_frames_ = endpoint_buffer_size_frames_;
 
   // Create and start the thread that will drive the rendering by waiting for
   // render events.
   render_thread_.reset(new base::DelegateSimpleThread(
       this, "wasapi_render_thread",
       base::SimpleThread::Options(base::ThreadPriority::REALTIME_AUDIO)));
   render_thread_->Start();
-  if (!render_thread_->HasBeenStarted()) {
-    LOG(ERROR) << "Failed to start WASAPI render thread.";
-    StopThread();
-    callback->OnError(this);
-    return;
-  }
 
   // Start streaming data between the endpoint buffer and the audio engine.
   HRESULT hr = audio_client_->Start();
   if (FAILED(hr)) {
     PLOG(ERROR) << "Failed to start output streaming: " << std::hex << hr;
     StopThread();
     callback->OnError(this);
   }
 }
 
@@ skipping 327 matching lines @@
     return hr;
   }
 
   *endpoint_buffer_size = buffer_size_in_frames;
   DVLOG(2) << "endpoint buffer size: " << buffer_size_in_frames;
   return hr;
 }
 
 void WASAPIAudioOutputStream::StopThread() {
   if (render_thread_) {
-    if (render_thread_->HasBeenStarted()) {
-      // Wait until the thread completes and perform cleanup.
-      SetEvent(stop_render_event_.Get());
-      render_thread_->Join();
-    }
+    // Wait until the thread completes and perform cleanup.
+    SetEvent(stop_render_event_.Get());
+    render_thread_->Join();
 
     render_thread_.reset();
 
     // Ensure that we don't quit the main thread loop immediately next
     // time Start() is called.
     ResetEvent(stop_render_event_.Get());
   }
 
   source_ = NULL;
 }
 
 }  // namespace media