diff options
| -rw-r--r-- | library/std/src/sys/windows/thread_parker.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/library/std/src/sys/windows/thread_parker.rs b/library/std/src/sys/windows/thread_parker.rs index 8f45db78d2f..3311627f170 100644 --- a/library/std/src/sys/windows/thread_parker.rs +++ b/library/std/src/sys/windows/thread_parker.rs @@ -158,8 +158,10 @@ impl Parker { // Need to wait for unpark() using NtWaitForKeyedEvent. let handle = keyed_event_handle(); - // NtWaitForKeyedEvent uses a unit of 100ns, and uses negative values - // to indicate the monotonic clock. + // NtWaitForKeyedEvent uses a unit of 100ns, and uses negative + // values to indicate a relative time on the monotonic clock. + // This is documented here for the underlying KeWaitForSingleObject function: + // https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nf-wdm-kewaitforsingleobject let mut timeout = match i64::try_from((timeout.as_nanos() + 99) / 100) { Ok(t) => -t, Err(_) => i64::MIN, |