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use super::*;
pub struct Waiter(HANDLE);
pub struct WaiterSignaler(HANDLE);
unsafe impl Send for WaiterSignaler {}
impl Waiter {
pub fn new() -> crate::Result<(Waiter, WaiterSignaler)> {
unsafe {
let handle = CreateEventW(core::ptr::null(), 1, 0, core::ptr::null());
if handle.is_null() {
Err(crate::Error::from_win32())
} else {
Ok((Waiter(handle), WaiterSignaler(handle)))
}
}
}
}
impl WaiterSignaler {
/// # Safety
/// Signals the `Waiter`. This is unsafe because the lifetime of `WaiterSignaler` is not tied
/// to the lifetime of the `Waiter`. This is not possible in this case because the `Waiter`
/// is used to signal a WinRT async completion and the compiler doesn't know that the lifetime
/// of the delegate is bounded by the calling function.
pub unsafe fn signal(&self) {
SetEvent(self.0);
}
}
impl Drop for Waiter {
fn drop(&mut self) {
unsafe {
WaitForSingleObject(self.0, 0xFFFFFFFF);
CloseHandle(self.0);
}
}
}