#define MC_TICK_CHECK ( ( TICK_USAGE > Master.current_ticklimit || src.state != SS_RUNNING ) ? pause() : 0 )
#define CURRENT_RUNLEVEL (2 ** (Master.current_runlevel - 1))

#define MC_SPLIT_TICK_INIT(phase_count) var/original_tick_limit = Master.current_ticklimit; var/split_tick_phases = ##phase_count
#define MC_SPLIT_TICK \
	if(split_tick_phases > 1){\
		Master.current_ticklimit = ((original_tick_limit - TICK_USAGE) / split_tick_phases) + TICK_USAGE;\
		--split_tick_phases;\
	} else {\
		Master.current_ticklimit = original_tick_limit;\
	}

// Used to smooth out costs to try and avoid oscillation.
#define MC_AVERAGE_FAST(average, current) (0.7 * (average) + 0.3 * (current))
#define MC_AVERAGE(average, current) (0.8 * (average) + 0.2 * (current))
#define MC_AVERAGE_SLOW(average, current) (0.9 * (average) + 0.1 * (current))

#define MC_AVG_FAST_UP_SLOW_DOWN(average, current) (average > current ? MC_AVERAGE_SLOW(average, current) : MC_AVERAGE_FAST(average, current))
#define MC_AVG_SLOW_UP_FAST_DOWN(average, current) (average < current ? MC_AVERAGE_SLOW(average, current) : MC_AVERAGE_FAST(average, current))

///creates a running average of "things elapsed" per time period when you need to count via a smaller time period.
///eg you want an average number of things happening per second but you measure the event every tick (50 milliseconds).
///make sure both time intervals are in the same units. doesn't work if current_duration > total_duration or if total_duration == 0
#define MC_AVG_OVER_TIME(average, current, total_duration, current_duration) ((((total_duration) - (current_duration)) / (total_duration)) * (average) + (current))

#define MC_AVG_MINUTES(average, current, current_duration) (MC_AVG_OVER_TIME(average, current, 1 MINUTES, current_duration))

#define MC_AVG_SECONDS(average, current, current_duration) (MC_AVG_OVER_TIME(average, current, 1 SECONDS, current_duration))

#define NEW_SS_GLOBAL(varname) if(varname != src){if(istype(varname)){Recover();qdel(varname);}varname = src;}

#define START_PROCESSING(Processor, Datum) if (!(Datum.datum_flags & DF_ISPROCESSING)) {Datum.datum_flags |= DF_ISPROCESSING;Processor.processing += Datum}
#define STOP_PROCESSING(Processor, Datum) Datum.datum_flags &= ~DF_ISPROCESSING;Processor.processing -= Datum

//! SubSystem flags (Please design any new flags so that the default is off, to make adding flags to subsystems easier)

/// subsystem does not initialize.
#define SS_NO_INIT 1

/** subsystem does not fire. */
/// (like can_fire = 0, but keeps it from getting added to the processing subsystems list)
/// (Requires a MC restart to change)
#define SS_NO_FIRE 2

/** subsystem only runs on spare cpu (after all non-background subsystems have ran that tick) */
/// SS_BACKGROUND has its own priority bracket
#define SS_BACKGROUND 4

/// subsystem does not tick check, and should not run unless there is enough time (or its running behind (unless background))
#define SS_NO_TICK_CHECK 8

/** Treat wait as a tick count, not DS, run every wait ticks. */
/// (also forces it to run first in the tick, above even SS_NO_TICK_CHECK subsystems)
/// (implies all runlevels because of how it works)
/// (overrides SS_BACKGROUND)
/// This is designed for basically anything that works as a mini-mc (like SStimer)
#define SS_TICKER 16

/** keep the subsystem's timing on point by firing early if it fired late last fire because of lag */
/// ie: if a 20ds subsystem fires say 5 ds late due to lag or what not, its next fire would be in 15ds, not 20ds.
#define SS_KEEP_TIMING 32

/** Calculate its next fire after its fired. */
/// (IE: if a 5ds wait SS takes 2ds to run, its next fire should be 5ds away, not 3ds like it normally would be)
/// This flag overrides SS_KEEP_TIMING
#define SS_POST_FIRE_TIMING 64

//! SUBSYSTEM STATES
#define SS_IDLE 0		/// aint doing shit.
#define SS_QUEUED 1		/// queued to run
#define SS_RUNNING 2	/// actively running
#define SS_PAUSED 3		/// paused by mc_tick_check
#define SS_SLEEPING 4	/// fire() slept.
#define SS_PAUSING 5 	/// in the middle of pausing
// Subsystem init stages
#define INITSTAGE_EARLY 1 //! Early init stuff that doesn't need to wait for mapload
#define INITSTAGE_MAIN 2 //! Main init stage
#define INITSTAGE_MAX 2 //! Highest initstage.

#define SUBSYSTEM_DEF(X) GLOBAL_REAL(SS##X, /datum/controller/subsystem/##X);\
/datum/controller/subsystem/##X/New(){\
	NEW_SS_GLOBAL(SS##X);\
	PreInit();\
}\
/datum/controller/subsystem/##X

#define TIMER_SUBSYSTEM_DEF(X) GLOBAL_REAL(SS##X, /datum/controller/subsystem/timer/##X);\
/datum/controller/subsystem/timer/##X/New(){\
	NEW_SS_GLOBAL(SS##X);\
	PreInit();\
}\
/datum/controller/subsystem/timer/##X/fire() {..() /*just so it shows up on the profiler*/} \
/datum/controller/subsystem/timer/##X

#define PROCESSING_SUBSYSTEM_DEF(X) GLOBAL_REAL(SS##X, /datum/controller/subsystem/processing/##X);\
/datum/controller/subsystem/processing/##X/New(){\
	NEW_SS_GLOBAL(SS##X);\
	PreInit();\
}\
/datum/controller/subsystem/processing/##X/fire() {..() /*just so it shows up on the profiler*/} \
/datum/controller/subsystem/processing/##X

#define VERB_MANAGER_SUBSYSTEM_DEF(X) GLOBAL_REAL(SS##X, /datum/controller/subsystem/verb_manager/##X);\
/datum/controller/subsystem/verb_manager/##X/New(){\
	NEW_SS_GLOBAL(SS##X);\
	PreInit();\
}\
/datum/controller/subsystem/verb_manager/##X/fire() {..() /*just so it shows up on the profiler*/} \
/datum/controller/subsystem/verb_manager/##X

// Boilerplate code for multi-step processors. See machines.dm for example use.
#define INTERNAL_PROCESS_STEP(this_step, initial_step, proc_to_call, cost_var, next_step)\
if(current_step == this_step || (initial_step && !resumed)) /* So we start at step 1 if not resumed.*/ {\
	timer = TICK_USAGE;\
	proc_to_call(resumed);\
	cost_var = MC_AVERAGE(cost_var, TICK_DELTA_TO_MS(TICK_USAGE - timer));\
	if(state != SS_RUNNING){\
		return;\
	}\
	resumed = 0;\
	current_step = next_step;\
}