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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
schedule.h
Core device execution and scheduling engine.
***************************************************************************/
#pragma once
#ifndef __EMU_H__
#error Dont include this file directly; include emu.h instead.
#endif
#ifndef MAME_EMU_SCHEDULE_H
#define MAME_EMU_SCHEDULE_H
//**************************************************************************
// MACROS
//**************************************************************************
#define TIMER_CALLBACK_MEMBER(name) void name(s32 param)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// timer callbacks look like this
typedef named_delegate<void (s32)> timer_expired_delegate;
// ======================> emu_timer
class emu_timer
{
public:
// getters
bool enabled() const noexcept { return m_enabled; }
int param() const noexcept { return m_param; }
// setters
bool enable(bool enable = true) noexcept;
void set_param(int param) noexcept { m_param = param; }
// control
void reset(const attotime &duration = attotime::never) noexcept { adjust(duration, m_param, m_period); }
void adjust(attotime start_delay, s32 param = 0, const attotime &periodicity = attotime::never) noexcept;
// timing queries
bool running() const noexcept { return !m_expire.is_never(); }
attotime elapsed() const noexcept;
attotime remaining() const noexcept;
attotime start() const noexcept { return m_start; }
attotime expire() const noexcept { return m_expire; }
attotime period() const noexcept { return m_period; }
private:
// construction/destruction
emu_timer() noexcept;
~emu_timer();
// allocation and re-use
emu_timer &init(
running_machine &machine,
timer_expired_delegate &&callback,
attotime start_delay,
int param,
bool temporary);
// internal helpers
void register_save(save_manager &manager) ATTR_COLD;
void schedule_next_period() noexcept;
void dump() const;
// internal state
device_scheduler * m_scheduler; // reference to the owning machine
emu_timer * m_next; // next timer in order in the list
emu_timer * m_prev; // previous timer in order in the list
timer_expired_delegate m_callback; // callback function
s32 m_param; // integer parameter
bool m_enabled; // is the timer enabled?
bool m_temporary; // is the timer temporary?
attotime m_period; // the repeat frequency of the timer
attotime m_start; // time when the timer was started
attotime m_expire; // time when the timer will expire
friend class device_scheduler;
friend class fixed_allocator<emu_timer>;
friend class simple_list<emu_timer>; // FIXME: fixed_allocator requires this
};
// ======================> device_scheduler
class device_scheduler
{
friend class device_execute_interface;
friend class emu_timer;
public:
// construction/destruction
device_scheduler(running_machine &machine);
~device_scheduler();
// getters
running_machine &machine() const noexcept { return m_machine; }
attotime time() const noexcept;
emu_timer *first_timer() const noexcept { return m_timer_list; }
device_execute_interface *currently_executing() const noexcept { return m_executing_device; }
bool can_save() const;
// execution
void timeslice();
void abort_timeslice() noexcept;
void trigger(int trigid, const attotime &after = attotime::zero);
void add_quantum(const attotime &quantum, const attotime &duration);
void perfect_quantum(const attotime &duration);
void suspend_resume_changed() { m_suspend_changes_pending = true; }
// timers, specified by callback/name
emu_timer *timer_alloc(timer_expired_delegate callback);
[[deprecated("timer_set is deprecated; please avoid anonymous timers. Use TIMER_CALLBACK_MEMBER and an allocated emu_timer instead.")]]
void timer_set(const attotime &duration, timer_expired_delegate callback, int param = 0);
void synchronize(timer_expired_delegate callback = timer_expired_delegate(), int param = 0);
// debugging
void dump_timers() const;
// for emergencies only!
void eat_all_cycles();
private:
// callbacks
void timed_trigger(s32 param);
void presave();
void postload();
// scheduling helpers
void compute_perfect_interleave();
void rebuild_execute_list();
void apply_suspend_changes();
// timer helpers
emu_timer &timer_list_insert(emu_timer &timer);
emu_timer &timer_list_remove(emu_timer &timer);
void execute_timers();
// internal state
running_machine & m_machine; // reference to our machine
device_execute_interface * m_executing_device; // pointer to currently executing device
device_execute_interface * m_execute_list; // list of devices to be executed
attotime m_basetime; // global basetime; everything moves forward from here
// list of active timers
emu_timer * m_timer_list; // head of the active list
emu_timer * m_inactive_timers; // head of the inactive timer list
fixed_allocator<emu_timer> m_timer_allocator; // allocator for timers
// other internal states
emu_timer * m_callback_timer; // pointer to the current callback timer
bool m_callback_timer_modified; // true if the current callback timer was modified
attotime m_callback_timer_expire_time; // the original expiration time
bool m_suspend_changes_pending; // suspend/resume changes are pending
// scheduling quanta
class quantum_slot
{
friend class simple_list<quantum_slot>;
public:
quantum_slot *next() const { return m_next; }
quantum_slot * m_next;
attoseconds_t m_actual; // actual duration of the quantum
attoseconds_t m_requested; // duration of the requested quantum
attotime m_expire; // absolute expiration time of this quantum
};
simple_list<quantum_slot> m_quantum_list; // list of active quanta
fixed_allocator<quantum_slot> m_quantum_allocator; // allocator for quanta
attoseconds_t m_quantum_minimum; // duration of minimum quantum
};
#endif // MAME_EMU_SCHEDULE_H
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