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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_