86Box/src/timer.h

#ifndef _TIMER_H_
#define _TIMER_H_


extern int timer_start;

#define timer_start_period(cycles)                      \
        timer_start = cycles;

#define timer_end_period(cycles) 			\
	do 						\
	{						\
                int diff = timer_start - (cycles);      \
		timer_count -= diff;			\
                timer_start = cycles;                   \
		if (timer_count <= 0)			\
		{					\
			timer_process();		\
			timer_update_outstanding();	\
		}					\
	} while (0)

#define timer_clock()                                                   \
	do 						                \
	{						                \
                int diff;                                               \
                if (AT)                                                 \
                {                                                       \
                        diff = timer_start - (cycles << TIMER_SHIFT);   \
                        timer_start = cycles << TIMER_SHIFT;            \
                }                                                       \
                else                                                    \
                {                                                       \
                        diff = timer_start - (cycles * xt_cpu_multi);   \
                        timer_start = cycles * xt_cpu_multi;            \
                }                                                       \
		timer_count -= diff;			                \
		timer_process();		                        \
        	timer_update_outstanding();	                        \
	} while (0)

void timer_process();
void timer_update_outstanding();
void timer_reset();
int timer_add(void (*callback)(void *priv), int *count, int *enable, void *priv);
void timer_set_callback(int timer, void (*callback)(void *priv));

#define TIMER_ALWAYS_ENABLED &timer_one

extern int timer_count;
extern int timer_one;

#define TIMER_SHIFT 6

extern int TIMER_USEC;

#endif /*_TIMER_H_*/