Refactor isolate interrupts to use OOB messages instead of interrupt bits.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 1578 matching lines @@
 }
 
 
 DART_EXPORT void Dart_InterruptIsolate(Dart_Isolate isolate) {
   TRACE_API_CALL(CURRENT_FUNC);
   if (isolate == NULL) {
     FATAL1("%s expects argument 'isolate' to be non-null.",  CURRENT_FUNC);
   }
   // TODO(16615): Validate isolate parameter.
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
-  // Schedule the interrupt. The isolate will notice this bit being set if it
-  // is currently executing in Dart code.
-  iso->ScheduleInterrupts(Isolate::kApiInterrupt);
-  // If the isolate is blocked on the message queue, we post a dummy message
-  // to the isolate's main port. The message will be ultimately ignored, but as
-  // part of handling the message the interrupt bit which was set above will be
-  // honored.
-  // Can't use Dart_Post() since there isn't a current isolate.
-  Dart_CObject api_null = { Dart_CObject_kNull , { 0 } };
-  Dart_PostCObject(iso->main_port(), &api_null);
+  iso->SendInternalLibMessage(Isolate::kInterruptMsg, iso->pause_capability());
 }
 
 
 DART_EXPORT bool Dart_IsolateMakeRunnable(Dart_Isolate isolate) {
   CHECK_NO_ISOLATE(Isolate::Current());
   if (isolate == NULL) {
     FATAL1("%s expects argument 'isolate' to be non-null.",  CURRENT_FUNC);
   }
   // TODO(16615): Validate isolate parameter.
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
@@ skipping 4382 matching lines @@
                                    ApiReallocate);
   writer.WriteFullSnapshot();
   *vm_isolate_snapshot_size = writer.VmIsolateSnapshotSize();
   *isolate_snapshot_size = writer.IsolateSnapshotSize();
   *instructions_snapshot_size = writer.InstructionsSnapshotSize();
 
   return Api::Success();
 }
 
 }  // namespace dart