go aprof 源码
golang aprof 代码
文件路径：/src/runtime/testdata/testprogcgo/aprof.go
// Copyright 2016 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.
package main
// Test that SIGPROF received in C code does not crash the process
// looking for the C code's func pointer.
// This is a regression test for issue 14599, where profiling fails when the
// function is the first C function. Exported functions are the first C
// functions, so we use an exported function. Exported functions are created in
// lexicographical order of source files, so this file is named aprof.go to
// ensure its function is first.
// extern void CallGoNop();
import "C"
import (
"bytes"
"fmt"
"runtime/pprof"
"time"
)
func init() {
register("CgoCCodeSIGPROF", CgoCCodeSIGPROF)
}
//export GoNop
func GoNop() {}
func CgoCCodeSIGPROF() {
c := make(chan bool)
go func() {
<-c
start := time.Now()
for i := 0; i < 1e7; i++ {
if i%1000 == 0 {
if time.Since(start) > time.Second {
break
}
}
C.CallGoNop()
}
c <- true
}()
var buf bytes.Buffer
pprof.StartCPUProfile(&buf)
c <- true
<-c
pprof.StopCPUProfile()
fmt.Println("OK")
}
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