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// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
/**
* This is a system to schedule events into the emulated machine's future. Time is measured
* in main CPU clock cycles.
*
* To schedule an event, you first have to register its type. This is where you pass in the
* callback. You then schedule events using the type id you get back.
*
* The int cyclesLate that the callbacks get is how many cycles late it was.
* So to schedule a new event on a regular basis:
* inside callback:
* ScheduleEvent(periodInCycles - cyclesLate, callback, "whatever")
*/
#include <chrono>
#include <functional>
#include <string>
#include "common/common_types.h"
namespace Core::Timing {
struct EventType;
using TimedCallback = std::function<void(u64 userdata, int cycles_late)>;
/**
* CoreTiming begins at the boundary of timing slice -1. An initial call to Advance() is
* required to end slice -1 and start slice 0 before the first cycle of code is executed.
*/
void Init();
void Shutdown();
/**
* This should only be called from the emu thread, if you are calling it any other thread, you are
* doing something evil
*/
u64 GetTicks();
u64 GetIdleTicks();
void AddTicks(u64 ticks);
/**
* Returns the event_type identifier. if name is not unique, it will assert.
*/
EventType* RegisterEvent(const std::string& name, TimedCallback callback);
void UnregisterAllEvents();
/**
* After the first Advance, the slice lengths and the downcount will be reduced whenever an event
* is scheduled earlier than the current values.
* Scheduling from a callback will not update the downcount until the Advance() completes.
*/
void ScheduleEvent(s64 cycles_into_future, const EventType* event_type, u64 userdata = 0);
/**
* This is to be called when outside of hle threads, such as the graphics thread, wants to
* schedule things to be executed on the main thread.
* Not that this doesn't change slice_length and thus events scheduled by this might be called
* with a delay of up to MAX_SLICE_LENGTH
*/
void ScheduleEventThreadsafe(s64 cycles_into_future, const EventType* event_type, u64 userdata);
void UnscheduleEvent(const EventType* event_type, u64 userdata);
void UnscheduleEventThreadsafe(const EventType* event_type, u64 userdata);
/// We only permit one event of each type in the queue at a time.
void RemoveEvent(const EventType* event_type);
void RemoveNormalAndThreadsafeEvent(const EventType* event_type);
/** Advance must be called at the beginning of dispatcher loops, not the end. Advance() ends
* the previous timing slice and begins the next one, you must Advance from the previous
* slice to the current one before executing any cycles. CoreTiming starts in slice -1 so an
* Advance() is required to initialize the slice length before the first cycle of emulated
* instructions is executed.
*/
void Advance();
void MoveEvents();
/// Pretend that the main CPU has executed enough cycles to reach the next event.
void Idle();
/// Clear all pending events. This should ONLY be done on exit.
void ClearPendingEvents();
void ForceExceptionCheck(s64 cycles);
std::chrono::microseconds GetGlobalTimeUs();
int GetDowncount();
} // namespace Core::Timing
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