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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 VM_THREAD_INTERRUPTER_H_
#define VM_THREAD_INTERRUPTER_H_
#include "vm/allocation.h"
#include "vm/signal_handler.h"
#include "vm/os_thread.h"
namespace dart {
struct InterruptedThreadState {
ThreadId tid;
uintptr_t pc;
uintptr_t csp;
uintptr_t dsp;
uintptr_t fp;
uintptr_t lr;
};
// When a thread is interrupted the thread specific interrupt callback will be
// invoked. Each callback is given an InterruptedThreadState and the user data
// pointer. When inside a thread interrupt callback doing any of the following
// is forbidden:
// * Accessing TLS.
// * Allocating memory.
// * Taking a lock.
typedef void (*ThreadInterruptCallback)(const InterruptedThreadState& state,
void* data);
// State stored per registered thread.
class InterruptableThreadState {
public:
ThreadId id;
ThreadInterruptCallback callback;
void* data;
};
class ThreadInterrupter : public AllStatic {
public:
static void InitOnce();
static void Startup();
static void Shutdown();
// Delay between interrupts.
static void SetInterruptPeriod(intptr_t period);
// Wake up the thread interrupter thread.
static void WakeUp();
// Register the currently running thread for interrupts. If the current thread
// is already registered, callback and data will be updated.
static InterruptableThreadState* Register(ThreadInterruptCallback callback,
void* data);
// Unregister the currently running thread for interrupts.
static void Unregister();
// Get the current thread state. Will create a thread state if one hasn't
// been allocated.
static InterruptableThreadState* GetCurrentThreadState();
// Get the current thread state. Will not create one if one doesn't exist.
static InterruptableThreadState* CurrentThreadState();
// Interrupt a thread.
static void InterruptThread(InterruptableThreadState* thread_state);
private:
static const intptr_t kMaxThreads = 4096;
static bool initialized_;
static bool shutdown_;
static bool thread_running_;
static ThreadId interrupter_thread_id_;
static Monitor* monitor_;
static intptr_t interrupt_period_;
static intptr_t current_wait_time_;
static ThreadLocalKey thread_state_key_;
static bool InDeepSleep() {
return current_wait_time_ == Monitor::kNoTimeout;
}
static InterruptableThreadState* _EnsureThreadStateCreated();
static void UpdateStateObject(ThreadInterruptCallback callback, void* data);
static void SetCurrentThreadState(InterruptableThreadState* state);
static void ThreadMain(uword parameters);
static void InstallSignalHandler();
friend class ThreadInterrupterVisitIsolates;
};
void ThreadInterruptNoOp(const InterruptedThreadState& state, void* data);
} // namespace dart
#endif // VM_THREAD_INTERRUPTER_H_