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runtime: diagnose double wakeup on Note

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Double wakeup is prohibited by the Note interface
and checked in lock_sema.c.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6976054
This commit is contained in:
Dmitriy Vyukov 2012-12-24 21:06:57 +04:00
parent cfcc3ebfa4
commit 4380fa6d99
1 changed files with 2 additions and 1 deletions
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3
src/pkg/runtime/lock_futex.c
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@ -111,7 +111,8 @@ runtime·noteclear(Note *n)
void
runtime·notewakeup(Note *n)
{
runtime·xchg(&n->key, 1);
if(runtime·xchg(&n->key, 1))
runtime·throw("notewakeup - double wakeup");
runtime·futexwakeup(&n->key, 1);
}