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more runtime support for chan select default 

R=ken
OCL=18630
CL=18630
This commit is contained in:
Russ Cox 2008-11-05 18:04:24 -08:00
parent b69e80d8dd
commit a6af484328
1 changed files with 39 additions and 1 deletions
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40
src/runtime/chan.c
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@ -469,7 +469,7 @@ sys·selectrecv(Select *sel, Hchan *c, ...)
i = sel->ncase;
if(i >= sel->tcase)
throw("selectsend: too many cases");
throw("selectrecv: too many cases");
sel->ncase = i+1;
cas = &sel->scase[i];
@ -497,6 +497,44 @@ sys·selectrecv(Select *sel, Hchan *c, ...)
}
}
void
sys·selectdefault(Select *sel)
{
int32 i, eo;
Scase *cas;
Hchan *c;
c = nil;
i = sel->ncase;
if(i >= sel->tcase)
throw("selectdefault: too many cases");
sel->ncase = i+1;
cas = &sel->scase[i];
cas->pc = sys·getcallerpc(&sel);
cas->chan = c;
eo = rnd(sizeof(sel), sizeof(c));
eo = rnd(eo+sizeof(c), sizeof(byte*));
cas->so = rnd(eo+sizeof(byte*), 1);
cas->send = 2;
cas->u.elemp = *(byte**)((byte*)&sel + eo);
if(debug) {
prints("newselect s=");
sys·printpointer(sel);
prints(" pc=");
sys·printpointer(cas->pc);
prints(" chan=");
sys·printpointer(cas->chan);
prints(" so=");
sys·printint(cas->so);
prints(" send=");
sys·printint(cas->send);
prints("\n");
}
}
uint32 xxx = 0;
// selectgo(sel *byte);