31 lines
1.4 KiB
Rust
31 lines
1.4 KiB
Rust
use std::convert::TryInto;
|
|
use std::time::Instant;
|
|
|
|
use once_cell::sync::Lazy;
|
|
|
|
static INIT_TIME: Lazy<Instant> = Lazy::new(Instant::now);
|
|
|
|
pub fn now_including_suspend() -> u64 {
|
|
// For Windows:
|
|
// Instead of relying on figuring out the underlying functions,
|
|
// we can rely on the fact that `Instant::now` maps to [QueryPerformanceCounter] on Windows,
|
|
// so by comparing it to another arbitrary timestamp we will get a duration that will include
|
|
// suspend time.
|
|
// If we use that as a timestamp we can compare later timestamps to it and that will also
|
|
// include suspend time.
|
|
//
|
|
// [QueryPerformanceCounter]: https://docs.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileapi-queryperformancecounter
|
|
//
|
|
// For other operating systems:
|
|
// This fallback is not used on Linux, where it maps to `CLOCK_MONOTONIC`, which does NOT
|
|
// include suspend time. But we don't use it there, so no problem.
|
|
//
|
|
// This fallback is not used on macOS, where it maps to `mach_absolute_time`, which does NOT
|
|
// include suspend time. But we don't use it there, so no problem.
|
|
//
|
|
// For other operating systems we make no guarantees, other than that we won't panic.
|
|
let now = Instant::now();
|
|
now.checked_duration_since(*INIT_TIME)
|
|
.and_then(|diff| diff.as_nanos().try_into().ok())
|
|
.unwrap_or(0)
|
|
}
|