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runtime: better debug output for inconsistent Note

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Update #5139.
Double wakeup on Note was reported several times,
but no reliable reproducer.
There also was a strange report about weird value of epoll fd.
Maybe it's corruption of global data...

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12182043
This commit is contained in:
Dmitriy Vyukov 2013-07-31 22:03:59 +04:00
parent 658d19a53f
commit 98d94b589c
1 changed files with 6 additions and 1 deletions
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7
src/pkg/runtime/lock_futex.c
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@ -118,8 +118,13 @@ runtime·noteclear(Note *n)
void
runtime·notewakeup(Note *n)
{
if(runtime·xchg((uint32*)&n->key, 1))
uint32 old;
old = runtime·xchg((uint32*)&n->key, 1);
if(old != 0) {
runtime·printf("notewakeup - double wakeup (%d)\n", old);
runtime·throw("notewakeup - double wakeup");
}
runtime·futexwakeup((uint32*)&n->key, 1);
}