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//! Tests for the waitable polling on Windows.
#![cfg(windows)]
use polling::os::iocp::PollerIocpExt;
use polling::{Event, Events, PollMode, Poller};
use windows_sys::Win32::Foundation::CloseHandle;
use windows_sys::Win32::System::Threading::{CreateEventW, ResetEvent, SetEvent};
use std::io;
use std::os::windows::io::{AsRawHandle, RawHandle};
use std::os::windows::prelude::{AsHandle, BorrowedHandle};
use std::time::Duration;
/// A basic wrapper around the Windows event object.
struct EventHandle(RawHandle);
impl Drop for EventHandle {
fn drop(&mut self) {
unsafe {
CloseHandle(self.0 as _);
}
}
}
impl EventHandle {
fn new(manual_reset: bool) -> io::Result<Self> {
let handle = unsafe {
CreateEventW(
std::ptr::null_mut(),
manual_reset as _,
false as _,
std::ptr::null(),
)
};
if handle == 0 {
Err(io::Error::last_os_error())
} else {
Ok(Self(handle as _))
}
}
/// Reset the event object.
fn reset(&self) -> io::Result<()> {
if unsafe { ResetEvent(self.0 as _) } != 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
/// Set the event object.
fn set(&self) -> io::Result<()> {
if unsafe { SetEvent(self.0 as _) } != 0 {
Ok(())
} else {
Err(io::Error::last_os_error())
}
}
}
impl AsRawHandle for EventHandle {
fn as_raw_handle(&self) -> RawHandle {
self.0
}
}
impl AsHandle for EventHandle {
fn as_handle(&self) -> BorrowedHandle<'_> {
unsafe { BorrowedHandle::borrow_raw(self.0) }
}
}
#[test]
fn smoke() {
let poller = Poller::new().unwrap();
let event = EventHandle::new(true).unwrap();
unsafe {
poller
.add_waitable(&event, Event::all(0), PollMode::Oneshot)
.unwrap();
}
let mut events = Events::new();
poller
.wait(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert!(events.is_empty());
// Signal the event.
event.set().unwrap();
poller
.wait(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(events.iter().next().unwrap().with_no_extra(), Event::all(0));
// Interest should be cleared.
events.clear();
poller
.wait(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert!(events.is_empty());
// If we modify the waitable, it should be added again.
poller
.modify_waitable(&event, Event::all(0), PollMode::Oneshot)
.unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(events.iter().next().unwrap().with_no_extra(), Event::all(0));
// If we reset the event, it should not be signaled.
event.reset().unwrap();
poller
.modify_waitable(&event, Event::all(0), PollMode::Oneshot)
.unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert!(events.is_empty());
}
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