27 lines
685 B
Go
27 lines
685 B
Go
//go:build linux
|
|
package hodu
|
|
|
|
import "syscall"
|
|
import "unsafe"
|
|
|
|
//#include <time.h>
|
|
//import "C"
|
|
|
|
// C.CLOCK_MONOTONIC is more accurate when compiled with CGO.
|
|
// I want to avoid using it. so assume it is 1 on linux
|
|
//const CLOCK_MONOTONIC uintptr = C.CLOCK_MONOTONIC
|
|
const CLOCK_MONOTONIC uintptr = 1
|
|
|
|
// utilize the builtin runtime.nanotime()
|
|
//go:noescape
|
|
//go:linkname nanotime runtime.nanotime
|
|
func nanotime() int64
|
|
|
|
func monotonic_time() uint64 {
|
|
var ts syscall.Timespec
|
|
var errno syscall.Errno
|
|
_, _, errno = syscall.Syscall(syscall.SYS_CLOCK_GETTIME, CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)), 0)
|
|
if errno != 0 { return uint64(nanotime()) }
|
|
return uint64(ts.Nano())
|
|
}
|