| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| // Test that stack barriers are reset when a goroutine exits without |
| // Let the garbage collector run concurrently. |
| // Use enough stack to get stack barriers, but |
| // not so much that we go over _FixedStack. |
| // There's a very narrow window here on most |
| // OSs, so we basically can't do anything (not |
| // even a time.Sleep or a channel). |
| for atomic.LoadInt32(&done) == 0 { |
| atomic.StoreInt32(&done, 0) |
| // Exit without unwinding stack barriers. |
| // Generate some garbage. |
| x[i] = make([]byte, 1024*1024) |
| // Give GC some time to install stack barriers in the G. |
| time.Sleep(50 * time.Microsecond) |
| atomic.StoreInt32(&done, 1) |
| for atomic.LoadInt32(&done) == 1 { |