1991/0424/port/tcptimer.c (diff list | history)

port/tcptimer.c on 1991/0424
1991/0424		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "errno.h" #include "arp.h" #include "ipdat.h" /* Head of running timer chain */ Timer *timers; QLock timerlock; Rendez Tcpack; Rendez tcpflowr; void tcpackproc(void *junk) { Timer *t,*tp; Timer *expired; for(;;) { expired = 0; /* Run through the list of running timers, decrementing each one. * If one has expired, take it off the running list and put it * on a singly linked list of expired timers */ qlock(&timerlock); for(t = timers;t != 0; t = tp) { tp = t->next; if(tp == t) panic("Timer loop at %lux\n",(long)tp); if(t->state == TIMER_RUN && --(t->count) == 0){ /* Delete from active timer list */ if(timers == t) timers = t->next; if(t->next != 0) t->next->prev = t->prev; if(t->prev != 0) t->prev->next = t->next; t->state = TIMER_EXPIRE; /* Put on head of expired timer list */ t->next = expired; expired = t; } } qunlock(&timerlock); while((t = expired) != 0){ expired = t->next; if(t->state == TIMER_EXPIRE && t->func) (*t->func)(t->arg); } tsleep(&Tcpack, return0, 0, MSPTICK); } } void start_timer(Timer *t) { if(t == 0 || t->start == 0) return; qlock(&timerlock); t->count = t->start; if(t->state != TIMER_RUN){ t->state = TIMER_RUN; /* Put on head of active timer list */ t->prev = 0; t->next = timers; if(t->next != 0) t->next->prev = t; timers = t; } qunlock(&timerlock); } void stop_timer(Timer *t) { if(t == 0) return; qlock(&timerlock); if(t->state == TIMER_RUN){ /* Delete from active timer list */ if(timers == t) timers = t->next; if(t->next != 0) t->next->prev = t->prev; if(t->prev != 0) t->prev->next = t->next; } t->state = TIMER_STOP; qunlock(&timerlock); } void tcpflow(void *conv) { Ipconv *base, *ifc, *etab; base = (Ipconv*)conv; etab = &base[conf.ip]; for(;;) { sleep(&tcpflowr, return0, 0); for(ifc = base; ifc < etab; ifc++) { if(ifc->stproto == &tcpinfo && ifc->ref != 0 && ifc->readq && !QFULL(ifc->readq->next)) { tcprcvwin(ifc); tcp_acktimer(ifc); } } } }