/* sleep.h */ #define CVECTOR 0100 /* location of clock interrupt vector */ extern int clkruns; /* 1 iff clock exists; 0 otherwise */ /* Set at system startup. */ extern int clockq; /* q index of sleeping process list */ extern int count6; /* used to ignore 5 of 6 interrupts */ extern int count10; /* used to ignore 9 of 10 ticks */ extern long clktime; /* current time in secs since 1/1/70 */ extern int clmutex; /* mutual exclusion sem. for clock */ extern int *sltop; /* address of first key on clockq */ extern int slnempty; /* 1 iff clockq is nonempty */ extern int defclk; /* >0 iff clock interrupts are deferred */ extern int clkdiff; /* number of clock ticks deferred */ extern int clkint(); /* clock interrupt handler */