many-start-stop.go

     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
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