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 "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;
    }
    ThreadInterrupter::ThreadState* state =
        ThreadInterrupter::CurrentThreadState();
    if ((state == NULL) || (state->callback == NULL)) {
      // No interrupter state or callback.
      return;
    }
    ASSERT(Thread::Compare(state->id, Thread::GetCurrentThreadId()));
  }
};


void ThreadInterrupter::InterruptThreads(int64_t current_time) {
  for (intptr_t i = 0; i < threads_size_; i++) {
    ThreadState* state = threads_[i];
    ASSERT(state->id != Thread::kInvalidThreadId);
    if (FLAG_trace_thread_interrupter) {
      OS::Print("ThreadInterrupter interrupting %p\n",
                reinterpret_cast<void*>(state->id));
    }
    pthread_kill(state->id, SIGPROF);
  }
}


void ThreadInterrupter::InstallSignalHandler() {
  SignalHandler::Install(
      ThreadInterrupterAndroid::ThreadInterruptSignalHandler);
}


}  // namespace dart

#endif  // defined(TARGET_OS_ANDROID)