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bug in select default

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R=r
OCL=18741
CL=18741
This commit is contained in:
Ken Thompson 2008-11-06 17:50:28 -08:00
parent 9c7374d71b
commit 9b827cf9a0
1 changed files with 36 additions and 31 deletions
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67
src/runtime/chan.c
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@ -408,6 +408,8 @@ sys·newselect(int32 size, Select *sel)
if(debug) {
prints("newselect s=");
sys·printpointer(sel);
prints("newselect size=");
sys·printint(size);
prints("\n");
}
}
@ -523,8 +525,6 @@ sys·selectdefault(Select *sel, ...)
sys·printpointer(sel);
prints(" pc=");
sys·printpointer(cas->pc);
prints(" chan=");
sys·printpointer(cas->chan);
prints(" so=");
sys·printint(cas->so);
prints(" send=");
@ -544,7 +544,6 @@ sys·selectgo(Select *sel)
Hchan *c;
SudoG *sg;
G *gp;
byte *as;
if(xxx) {
@ -581,31 +580,35 @@ sys·selectgo(Select *sel)
dfl = nil;
for(i=0; i<sel->ncase; i++) {
cas = &sel->scase[o];
if(cas->send == 2) { // default
dfl = cas;
continue;
goto next1;
}
c = cas->chan;
if(c->dataqsiz > 0) {
if(cas->send) {
if(c->qcount < c->dataqsiz)
goto asyns;
} else {
if(c->qcount > 0)
goto asynr;
goto next1;
}
} else
if(c->qcount > 0)
goto asynr;
goto next1;
}
if(cas->send) {
sg = dequeue(&c->recvq, c);
if(sg != nil)
goto gots;
} else {
sg = dequeue(&c->sendq, c);
if(sg != nil)
goto gotr;
goto next1;
}
sg = dequeue(&c->sendq, c);
if(sg != nil)
goto gotr;
next1:
o += p;
if(o >= sel->ncase)
o -= sel->ncase;
@ -631,16 +634,17 @@ sys·selectgo(Select *sel)
sg = allocsg(c);
sg->offset = o;
enqueue(&c->sendq, sg);
} else {
if(c->qcount > 0) {
prints("selectgo: pass 2 async recv\n");
goto asynr;
}
sg = allocsg(c);
sg->offset = o;
enqueue(&c->recvq, sg);
goto next2;
}
} else
if(c->qcount > 0) {
prints("selectgo: pass 2 async recv\n");
goto asynr;
}
sg = allocsg(c);
sg->offset = o;
enqueue(&c->recvq, sg);
goto next2;
}
if(cas->send) {
sg = dequeue(&c->recvq, c);
@ -653,18 +657,19 @@ sys·selectgo(Select *sel)
sg->offset = o;
c->elemalg->copy(c->elemsize, sg->elem, cas->u.elem);
enqueue(&c->sendq, sg);
} else {
sg = dequeue(&c->sendq, c);
if(sg != nil) {
prints("selectgo: pass 2 sync recv\n");
g->selgen++;
goto gotr;
}
sg = allocsg(c);
sg->offset = o;
enqueue(&c->recvq, sg);
goto next2;
}
sg = dequeue(&c->sendq, c);
if(sg != nil) {
prints("selectgo: pass 2 sync recv\n");
g->selgen++;
goto gotr;
}
sg = allocsg(c);
sg->offset = o;
enqueue(&c->recvq, sg);
next2:
o += p;
if(o >= sel->ncase)
o -= sel->ncase;