runtime: preempt goroutines for GC
The last patch for preemptive scheduler,
with this change stoptheworld issues preemption
requests every 100us.
Update #543.
R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/10264044
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 4fb022c..8b3f10f 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -809,6 +809,7 @@
void runtime·exit(int32);
void runtime·breakpoint(void);
void runtime·gosched(void);
+void runtime·gosched0(G*);
void runtime·park(void(*)(Lock*), Lock*, int8*);
void runtime·tsleep(int64, int8*);
M* runtime·newm(void);
