Safepointing in GC

runtime/vm/thread_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
 #include "vm/unit_test.h"
 #include "vm/profiler.h"
 #include "vm/thread_pool.h"
@@ skipping 480 matching lines @@
   Monitor done_monitor;
   bool done = false;
   Isolate* isolate = Thread::Current()->isolate();
   // Flush store buffers, etc.
   // TODO(koda): Currently, the GC only does this for the current thread, (i.e,
   // the helper, in this test), but it should be done for all *threads*
   // while reaching a safepoint.
   Thread::PrepareForGC();
   Dart::thread_pool()->Run(new AllocAndGCTask(isolate, &done_monitor, &done));
   {
-    // Manually wait.
-    // TODO(koda): Replace with execution of Dart and/or VM code when GC
-    // actually safepoints everything.
-    MonitorLocker ml(&done_monitor);
-    while (!done) {
-      ml.Wait();
+    while (true) {
+      isolate->thread_registry()->CheckSafepoint();
+      MonitorLocker ml(&done_monitor);
+      if (done) {
+        break;
+      }
     }
   }
 }
 
 }  // namespace dart