Callout
Callout *c;
Callout *new;
register Callout *p1;
register Callout *c;
register Callout *new, *p, *t;
register Callout *p, *t;
static Callout scrClkCalloutArray[SCR_CLK_CALLOUT_COUNT];
static Callout *scrClkCallFree; /* free queue */
static Callout scrClkCallTodo; /* todo queue */