Completely remove InterruptableThreadState and Fix ThreadRegistry leak

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index e9ad1ccfa0de04fc67062c904699b5e00d6f3dba..9e42856dad656d21f36aaa974a75b3cab707776c 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -169,7 +169,8 @@ void Profiler::BeginExecution(Isolate* isolate) {
   if (profiler_data == NULL) {
     return;
   }
-  ThreadInterrupter::Register(RecordSampleInterruptCallback, isolate);
+  Thread* thread = Thread::Current();
+  thread->SetThreadInterrupter(RecordSampleInterruptCallback, isolate);

[Ivan Posva, 2015/08/20 18:00:10]

How often does the first value change while a process is running?

[Cutch, 2015/08/20 20:40:18]

Aside from tests it never changes.

   ThreadInterrupter::WakeUp();
 }
 
@@ -182,7 +183,8 @@ void Profiler::EndExecution(Isolate* isolate) {
     return;
   }
   ASSERT(initialized_);
-  ThreadInterrupter::Unregister();
+  Thread* thread = Thread::Current();
+  thread->SetThreadInterrupter(NULL, NULL);
 }