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runtime: work around Linux kernel bug in futex

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Fixes #420.

R=r
CC=golang-dev
https://golang.org/cl/218065
This commit is contained in:
Russ Cox 2010-02-22 20:45:36 -08:00
parent 5c2197ac8f
commit 8ba5c5593f
1 changed files with 6 additions and 14 deletions
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20
src/pkg/runtime/linux/thread.c
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@ -42,20 +42,12 @@ static Timespec longtime =
static void
futexsleep(uint32 *addr, uint32 val)
{
int32 ret;
ret = futex(addr, FUTEX_WAIT, val, &longtime, nil, 0);
if(ret >= 0 || ret == -EAGAIN || ret == -EINTR)
return;
prints("futexsleep addr=");
·printpointer(addr);
prints(" val=");
·printint(val);
prints(" returned ");
·printint(ret);
prints("\n");
*(int32*)0x1005 = 0x1005;
// Some Linux kernels have a bug where futex of
// FUTEX_WAIT returns an internal error code
// as an errno. Libpthread ignores the return value
// here, and so can we: as it says a few lines up,
// spurious wakeups are allowed.
futex(addr, FUTEX_WAIT, val, &longtime, nil, 0);
}
// If any procs are sleeping on addr, wake up at least one.