From 005806cab17a20adaec33a1ee02a19355356fa67 Mon Sep 17 00:00:00 2001
From: Keith Randall <khr@golang.org>
Date: Fri, 5 Sep 2014 14:59:31 -0700
Subject: runtime: run getgcmask on the M stack.

LGTM=rsc
R=rsc, khr
CC=golang-codereviews
https://golang.org/cl/132660043
---
 src/pkg/runtime/export_test.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'src/pkg/runtime/export_test.go')

diff --git a/src/pkg/runtime/export_test.go b/src/pkg/runtime/export_test.go
index 35a4130ee1..fd7fd182fc 100644
--- a/src/pkg/runtime/export_test.go
+++ b/src/pkg/runtime/export_test.go
@@ -111,8 +111,19 @@ func ParForIters(desc *ParFor, tid uint32) (uint32, uint32) {
 	return begin, end
 }
 
+// in mgc0.c
 //go:noescape
-func GCMask(x interface{}) []byte
+func getgcmask(data unsafe.Pointer, typ *_type, array **byte, len *uint)
+
+func GCMask(x interface{}) (ret []byte) {
+	e := (*eface)(unsafe.Pointer(&x))
+	s := (*slice)(unsafe.Pointer(&ret))
+	onM(func() {
+		getgcmask(e.data, e._type, &s.array, &s.len)
+		s.cap = s.len
+	})
+	return
+}
 
 func testSchedLocalQueue()
 func testSchedLocalQueueSteal()
-- 
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