runtime: make notetsleep() return false if timeout happens
This is needed for preemptive scheduler, because during
stoptheworld we want to wait with timeout and re-preempt
M's on timeout.
R=golang-dev, remyoudompheng, iant
CC=golang-dev
https://golang.org/cl/9375043
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index c7ade2b..2d918f4 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -862,7 +862,7 @@
void runtime·noteclear(Note*);
void runtime·notesleep(Note*);
void runtime·notewakeup(Note*);
-void runtime·notetsleep(Note*, int64);
+bool runtime·notetsleep(Note*, int64); // false - timeout
/*
* low-level synchronization for implementing the above
