VM thread shutdown.

runtime/vm/thread_interrupter.cc

Index: runtime/vm/thread_interrupter.cc
diff --git a/runtime/vm/thread_interrupter.cc b/runtime/vm/thread_interrupter.cc
index 23e6c22fc4df17365db199763c694b035edc0769..776a2ac1d820dc4683efaca142a06058be6eb061 100644
--- a/runtime/vm/thread_interrupter.cc
+++ b/runtime/vm/thread_interrupter.cc
@@ -101,24 +101,12 @@ void ThreadInterrupter::Shutdown() {
       OS::Print("ThreadInterrupter shutting down.\n");
     }
   }
-#if defined(TARGET_OS_WINDOWS)
-  // On Windows, a thread's exit-code can leak into the process's exit-code,
-  // if exiting 'at same time' as the process ends. By joining with the thread
-  // here, we avoid this race condition.
+
+  // Join the thread.
   ASSERT(interrupter_thread_id_ != OSThread::kInvalidThreadId);
   OSThread::Join(interrupter_thread_id_);
   interrupter_thread_id_ = OSThread::kInvalidThreadId;
-#else
-  // On non-Windows platforms, just wait for the thread interrupter to signal
-  // that it has exited the loop.
-  {
-    MonitorLocker shutdown_ml(monitor_);
-    while (thread_running_) {
-      // Wait for thread to exit.
-      shutdown_ml.Wait();
-    }
-  }
-#endif
+
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter shut down.\n");
   }