Switch profiler from isolates to threads [second landing]

runtime/vm/thread_interrupter_android.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 "platform/globals.h"
 #if defined(TARGET_OS_ANDROID)
 
 #include <sys/syscall.h>  // NOLINT
+#include <errno.h>  // NOLINT
 
 #include "vm/flags.h"
 #include "vm/os.h"
+#include "vm/profiler.h"
 #include "vm/signal_handler.h"
 #include "vm/thread_interrupter.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, thread_interrupter);
 DECLARE_FLAG(bool, trace_thread_interrupter);
 
 class ThreadInterrupterAndroid : public AllStatic {
  public:
   static void ThreadInterruptSignalHandler(int signal, siginfo_t* info,
                                            void* context_) {
     if (signal != SIGPROF) {
       return;
     }
     Thread* thread = Thread::Current();
     if (thread == NULL) {
       return;
     }
-    ThreadInterruptCallback callback = NULL;
-    void* callback_data = NULL;
-    if (!thread->IsThreadInterrupterEnabled(&callback, &callback_data)) {
-      return;
-    }
     // Extract thread state.
     ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
     mcontext_t mcontext = context->uc_mcontext;
     InterruptedThreadState its;
-    its.tid = thread->id();
     its.pc = SignalHandler::GetProgramCounter(mcontext);
     its.fp = SignalHandler::GetFramePointer(mcontext);
     its.csp = SignalHandler::GetCStackPointer(mcontext);
     its.dsp = SignalHandler::GetDartStackPointer(mcontext);
     its.lr = SignalHandler::GetLinkRegister(mcontext);
-    callback(its, callback_data);
+    Profiler::SampleThread(thread, its);
   }
 };
 
 
 void ThreadInterrupter::InterruptThread(Thread* thread) {
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter interrupting %p\n",
               reinterpret_cast<void*>(thread->id()));
   }
   int result = syscall(__NR_tgkill, getpid(), thread->id(), SIGPROF);
-  ASSERT(result == 0);
+  ASSERT((result == 0) || (result == ESRCH));
 }
 
 
 void ThreadInterrupter::InstallSignalHandler() {
   SignalHandler::Install(
       ThreadInterrupterAndroid::ThreadInterruptSignalHandler);
 }
 
 
 void ThreadInterrupter::RemoveSignalHandler() {
   SignalHandler::Remove();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_ANDROID)