Only use raw monotonic time on Linux and macOS

tools/utils/clock_with_raw.go

@@ -0,0 +1,18 @@
+//go:build linux || darwin
+
+package utils
+
+import (
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func MonotonicRaw() (time.Time, error) {
+	ts := unix.Timespec{}
+	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC_RAW, &ts); err != nil {
+		return time.Time{}, err
+	}
+	s, ns := ts.Unix()
+	return time.Unix(s, ns), nil
+}

tools/utils/clock_without_raw.go

@@ -0,0 +1,18 @@
+//go:build !linux && !darwin
+
+package utils
+
+import (
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func MonotonicRaw() (time.Time, error) {
+	ts := unix.Timespec{}
+	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC, &ts); err != nil {
+		return time.Time{}, err
+	}
+	s, ns := ts.Unix()
+	return time.Unix(s, ns), nil
+}

tools/utils/misc.go

@@ -10,11 +10,9 @@ import (
 	"reflect"
 	"runtime"
 	"strconv"
-	"time"
 
 	"golang.org/x/exp/constraints"
 	"golang.org/x/exp/slices"
-	"golang.org/x/sys/unix"
 )
 
 var _ = fmt.Print
@@ -312,16 +310,3 @@ func FunctionName(a any) string {
 	}
 	return ""
 }
-
-func MonotonicRaw() (time.Time, error) {
-	ts := unix.Timespec{}
-	var clock_id int32 = unix.CLOCK_MONOTONIC
-	if runtime.GOOS == "linux" {
-		clock_id = unix.CLOCK_MONOTONIC_RAW
-	}
-	if err := unix.ClockGettime(clock_id, &ts); err != nil {
-		return time.Time{}, err
-	}
-	s, ns := ts.Unix()
-	return time.Unix(s, ns), nil
-}