From 56ab1e809117c614b2131493c710754da6e29cca Mon Sep 17 00:00:00 2001
From: maypok86 <alex.mayshev.86@gmail.com>
Date: Mon, 9 Sep 2024 09:13:46 +0300
Subject: [PATCH] fix: stop importing nanotime from runtime via linkname

---
 nanotime.go        | 16 ++++++++++++++++
 nanotime_time.go   | 13 -------------
 nanotime_unsafe.go | 12 ------------
 3 files changed, 16 insertions(+), 25 deletions(-)
 create mode 100644 nanotime.go
 delete mode 100644 nanotime_time.go
 delete mode 100644 nanotime_unsafe.go

diff --git a/nanotime.go b/nanotime.go
new file mode 100644
index 0000000..8a5351a
--- /dev/null
+++ b/nanotime.go
@@ -0,0 +1,16 @@
+package puddle
+
+import "time"
+
+// nanotime returns the time in nanoseconds since process start.
+//
+// This approach, described at
+// https://github.com/golang/go/issues/61765#issuecomment-1672090302,
+// is fast, monotonic, and portable, and avoids the previous
+// dependence on runtime.nanotime using the (unsafe) linkname hack.
+// In particular, time.Since does less work than time.Now.
+func nanotime() int64 {
+	return time.Since(globalStart).Nanoseconds()
+}
+
+var globalStart = time.Now()
diff --git a/nanotime_time.go b/nanotime_time.go
deleted file mode 100644
index f8e7593..0000000
--- a/nanotime_time.go
+++ /dev/null
@@ -1,13 +0,0 @@
-//go:build purego || appengine || js
-
-// This file contains the safe implementation of nanotime using time.Now().
-
-package puddle
-
-import (
-	"time"
-)
-
-func nanotime() int64 {
-	return time.Now().UnixNano()
-}
diff --git a/nanotime_unsafe.go b/nanotime_unsafe.go
deleted file mode 100644
index fc3b8a2..0000000
--- a/nanotime_unsafe.go
+++ /dev/null
@@ -1,12 +0,0 @@
-//go:build !purego && !appengine && !js
-
-// This file contains the implementation of nanotime using runtime.nanotime.
-
-package puddle
-
-import "unsafe"
-
-var _ = unsafe.Sizeof(0)
-
-//go:linkname nanotime runtime.nanotime
-func nanotime() int64