1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/rust/zeitstempel/src/win.rs b/third_party/rust/zeitstempel/src/win.rs
new file mode 100644
index 0000000000..37e8553498
--- /dev/null
+++ b/third_party/rust/zeitstempel/src/win.rs
@@ -0,0 +1,42 @@
+//! Timestamp implementation for Windows 10+ or Windows Server 2016+.
+//!
+//! Lower versions don't have the necessary API and should use the fallback.
+
+#![cfg(feature = "win10plus")]
+
+/// [PULONGLONG] is a pointer to [ULONGLONG], a 64-bit unsigned integer.
+///
+/// [PULONGLONG]: https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types#PULONGLONG
+/// [ULONGLONG]: https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types#ulonglong
+type PULONGLONG = *mut u64;
+
+/// Link against Windows' `mincore`.
+#[link(name = "mincore")]
+extern "system" {
+    /// Gets the current interrupt-time count.
+    ///
+    /// See [`QueryInterruptTime`].
+    ///
+    /// [`QueryInterruptTime`]: https://docs.microsoft.com/en-us/windows/win32/api/realtimeapiset/nf-realtimeapiset-queryinterrupttime
+    ///
+    /// Note: we define it ourselves, because it's not actually included in `winapi`.
+    fn QueryInterruptTime(InterruptTime: PULONGLONG);
+}
+
+/// Windows counts time in a system time unit of 100 nanoseconds.
+const SYSTEM_TIME_UNIT: u64 = 100;
+
+/// The time based on the current interrupt-time count.
+/// This includes the suspend time.
+///
+/// See [`QueryInterruptTime`].
+///
+/// [`QueryInterruptTime`]: https://docs.microsoft.com/en-us/windows/win32/api/realtimeapiset/nf-realtimeapiset-queryinterrupttime
+pub fn now_including_suspend() -> u64 {
+    let mut interrupt_time = 0;
+    unsafe {
+        QueryInterruptTime(&mut interrupt_time);
+    }
+
+    interrupt_time * SYSTEM_TIME_UNIT
+}