1 // Copyright 2023 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // Tests simply starting and stopping tracing multiple times. 6 // 7 // This is useful for finding bugs in trace state reset. 8 9 //go:build ignore 10 11 package main 12 13 import ( 14 "bytes" 15 "log" 16 "os" 17 "runtime" 18 "runtime/trace" 19 ) 20 21 func main() { 22 // Trace a few times. 23 for i := 0; i < 10; i++ { 24 var buf bytes.Buffer 25 if err := trace.Start(&buf); err != nil { 26 log.Fatalf("failed to start tracing: %v", err) 27 } 28 runtime.GC() 29 trace.Stop() 30 } 31 32 // Start tracing again, this time writing out the result. 33 if err := trace.Start(os.Stdout); err != nil { 34 log.Fatalf("failed to start tracing: %v", err) 35 } 36 runtime.GC() 37 trace.Stop() 38 } 39