thread_interrupter.h

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// 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.
 
#ifndef RUNTIME_VM_THREAD_INTERRUPTER_H_
#define RUNTIME_VM_THREAD_INTERRUPTER_H_
 
#include "vm/allocation.h"
#include "vm/os_thread.h"
#include "vm/signal_handler.h"
#include "vm/thread.h"
 
namespace dart {
 
struct InterruptedThreadState {
  uintptr_t pc;
  uintptr_t csp;
  uintptr_t dsp;
  uintptr_t fp;
  uintptr_t lr;
};
 
class ThreadInterrupter : public AllStatic {
 public:
  static void Init();
 
  static void Startup();
  static void Cleanup();
 
  // Delay between interrupts.
  static void SetInterruptPeriod(intptr_t period);
 
  // Wake up the thread interrupter thread.
  static void WakeUp();
 
  // Interrupt a thread.
  static void InterruptThread(OSThread* thread);
 
  // Prepare current thread for handling interrupts. Returns
  // opaque pointer to the allocated state (if any).
  static void* PrepareCurrentThread();
 
  // Cleanup any state which was created by |PrepareCurrentThread|.
  static void CleanupCurrentThreadState(void* state);
 
 private:
  static constexpr intptr_t kMaxThreads = 4096;
  static bool initialized_;
  static bool shutdown_;
  static bool thread_running_;
  static bool woken_up_;
  static ThreadJoinId interrupter_thread_id_;
  static Monitor* monitor_;
  static intptr_t interrupt_period_;
  static intptr_t current_wait_time_;
 
  static bool InDeepSleep() {
    return current_wait_time_ == Monitor::kNoTimeout;
  }
 
  static void ThreadMain(uword parameters);
 
  static void InstallSignalHandler();
 
  static void RemoveSignalHandler();
 
  friend class ThreadInterrupterVisitIsolates;
};
 
}  // namespace dart
 
#endif  // RUNTIME_VM_THREAD_INTERRUPTER_H_