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      1 // Copyright 2017 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 package trace_test
      6 
      7 import (
      8 	"fmt"
      9 	"log"
     10 	"os"
     11 	"runtime/trace"
     12 )
     13 
     14 // Example demonstrates the use of the trace package to trace
     15 // the execution of a Go program. The trace output will be
     16 // written to the file trace.out
     17 func Example() {
     18 	f, err := os.Create("trace.out")
     19 	if err != nil {
     20 		log.Fatalf("failed to create trace output file: %v", err)
     21 	}
     22 	defer func() {
     23 		if err := f.Close(); err != nil {
     24 			log.Fatalf("failed to close trace file: %v", err)
     25 		}
     26 	}()
     27 
     28 	if err := trace.Start(f); err != nil {
     29 		log.Fatalf("failed to start trace: %v", err)
     30 	}
     31 	defer trace.Stop()
     32 
     33 	// your program here
     34 	RunMyProgram()
     35 }
     36 
     37 func RunMyProgram() {
     38 	fmt.Printf("this function will be traced")
     39 }
     40