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runtime: don't let select split stack

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Fixes #1209.

R=ken2
CC=golang-dev
https://golang.org/cl/2612041
This commit is contained in:
Russ Cox 2010-10-20 15:54:17 -04:00
parent c026c91b5c
commit 6a3b29895f
1 changed files with 6 additions and 0 deletions
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6
src/pkg/runtime/chan.c
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@ -620,6 +620,12 @@ selunlock(Select *sel)
} }
// selectgo(sel *byte); // selectgo(sel *byte);
//
// overwrites return pc on stack to signal which case of the select
// to run, so cannot appear at the top of a split stack.
// frame has 6 pointers and 4 int32 so 64 bytes max.
// that's less than StackGuard-StackSmall, so okay.
#pragma textflag 7
void void
·selectgo(Select *sel) ·selectgo(Select *sel)
{ {