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// Copyright 2019 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.
//go:build darwin || freebsd || linux || netbsd || openbsd
package pprof
import (
"syscall"
"time"
)
func init() {
diffCPUTimeImpl = diffCPUTimeRUsage
}
func diffCPUTimeRUsage(f func()) time.Duration {
ok := true
var before, after syscall.Rusage
err := syscall.Getrusage(syscall.RUSAGE_SELF, &before)
if err != nil {
ok = false
}
f()
err = syscall.Getrusage(syscall.RUSAGE_SELF, &after)
if err != nil {
ok = false
}
if !ok {
return 0
}
return time.Duration((after.Utime.Nano() + after.Stime.Nano()) - (before.Utime.Nano() + before.Stime.Nano()))
}
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