gprof.go

Documentation: runtime/testdata/testprogcgo

     1  // Copyright 2021 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 main
     6  
     7  // Test taking a goroutine profile with C traceback.
     8  
     9  /*
    10  // Defined in gprof_c.c.
    11  void CallGoSleep(void);
    12  void gprofCgoTraceback(void* parg);
    13  void gprofCgoContext(void* parg);
    14  */
    15  import "C"
    16  
    17  import (
    18  	"fmt"
    19  	"io"
    20  	"runtime"
    21  	"runtime/pprof"
    22  	"time"
    23  	"unsafe"
    24  )
    25  
    26  func init() {
    27  	register("GoroutineProfile", GoroutineProfile)
    28  }
    29  
    30  func GoroutineProfile() {
    31  	runtime.SetCgoTraceback(0, unsafe.Pointer(C.gprofCgoTraceback), unsafe.Pointer(C.gprofCgoContext), nil)
    32  
    33  	go C.CallGoSleep()
    34  	go C.CallGoSleep()
    35  	go C.CallGoSleep()
    36  	time.Sleep(1 * time.Second)
    37  
    38  	prof := pprof.Lookup("goroutine")
    39  	prof.WriteTo(io.Discard, 1)
    40  	fmt.Println("OK")
    41  }
    42  
    43  //export GoSleep
    44  func GoSleep() {
    45  	time.Sleep(time.Hour)
    46  }
    47
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