time.h

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#ifndef KERNEL_TIME_H
#define KERNEL_TIME_H
 
/*
 * The number of clock ticks in a second (100Hz, 1 tick = 100ms).
 *
 * This is also used as the maximum time a thread is allowed to run for
 * before being rescheduled (thread will be forcefully rescheduled
 * when a timer interrupt eventually occurs).
 */
#define TICKS_PER_SECOND 100
 
#define SEC(_x) (_x)
#define MS(_s) (1000 * SEC(_s))
#define US(_s) (1000 * MS((_s)))
#define NS(_s) (1000 * US((_s)))
#define SEC_TO_SEC(_s) SEC(_s)
#define MS_TO_SEC(_s) (SEC(_s) / 1000)
#define US_TO_SEC(_s) (MS((_s)) / 1000)
#define NS_TO_SEC(_s) (US((_s)) / 1000)
#endif /* KERNEL_TIME_H */