mirror of https://github.com/0intro/conterm
91 lines
1.3 KiB
C
91 lines
1.3 KiB
C
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#include "u.h"
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#include "lib.h"
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#include "dat.h"
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#include "fns.h"
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#include "error.h"
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void
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sleep(Rendez *r, int (*f)(void*), void *arg)
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{
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int s;
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s = splhi();
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lock(&r->lk);
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lock(&up->rlock);
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if(r->p){
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print("double sleep %lud %lud\n", r->p->pid, up->pid);
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dumpstack();
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}
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/*
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* Wakeup only knows there may be something to do by testing
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* r->p in order to get something to lock on.
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* Flush that information out to memory in case the sleep is
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* committed.
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*/
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r->p = up;
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if((*f)(arg) || up->notepending){
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/*
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* if condition happened or a note is pending
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* never mind
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*/
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r->p = nil;
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unlock(&up->rlock);
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unlock(&r->lk);
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} else {
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/*
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* now we are committed to
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* change state and call scheduler
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*/
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up->state = Wakeme;
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up->r = r;
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/* statistics */
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/* m->cs++; */
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unlock(&up->rlock);
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unlock(&r->lk);
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procsleep();
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}
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if(up->notepending) {
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up->notepending = 0;
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splx(s);
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error(Eintr);
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}
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splx(s);
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}
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Proc*
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wakeup(Rendez *r)
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{
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Proc *p;
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int s;
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s = splhi();
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lock(&r->lk);
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p = r->p;
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if(p != nil){
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lock(&p->rlock);
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if(p->state != Wakeme || p->r != r)
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panic("wakeup: state");
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r->p = nil;
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p->r = nil;
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p->state = Running;
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procwakeup(p);
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unlock(&p->rlock);
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}
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unlock(&r->lk);
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splx(s);
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return p;
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}
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