1 files changed, 39 insertions, 0 deletions
diff --git a/src/runtime/pprof/rusage_test.go b/src/runtime/pprof/rusage_test.go
new file mode 100644
index 0000000..b0d651e
--- /dev/null
+++ b/src/runtime/pprof/rusage_test.go
@@ -0,0 +1,39 @@
+// 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()))
+}