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use std::{io, ptr};
use windows_sys::Win32::{
Foundation::{CloseHandle, DuplicateHandle, BOOL, DUPLICATE_SAME_ACCESS, HANDLE},
System::Threading::{CreateEventW, GetCurrentProcess, SetEvent},
};
/// Windows event object
pub struct Event(HANDLE);
unsafe impl Send for Event {}
unsafe impl Sync for Event {}
impl Event {
/// Create a new event object using `CreateEventW`
pub fn new(manual_reset: bool, initial_state: bool) -> io::Result<Self> {
let event = unsafe {
CreateEventW(
ptr::null_mut(),
bool_to_winbool(manual_reset),
bool_to_winbool(initial_state),
ptr::null(),
)
};
if event == 0 {
return Err(io::Error::last_os_error());
}
Ok(Self(event))
}
/// Signal the event object
pub fn set(&self) -> io::Result<()> {
if unsafe { SetEvent(self.0) } == 0 {
return Err(io::Error::last_os_error());
}
Ok(())
}
/// Return raw event object
pub fn as_raw(&self) -> HANDLE {
self.0
}
/// Duplicate the event object with `DuplicateHandle()`
pub fn duplicate(&self) -> io::Result<Event> {
let mut new_event = 0;
let status = unsafe {
DuplicateHandle(
GetCurrentProcess(),
self.0,
GetCurrentProcess(),
&mut new_event,
0,
0,
DUPLICATE_SAME_ACCESS,
)
};
if status == 0 {
return Err(io::Error::last_os_error());
}
Ok(Event(new_event))
}
}
impl Drop for Event {
fn drop(&mut self) {
unsafe { CloseHandle(self.0) };
}
}
const fn bool_to_winbool(val: bool) -> BOOL {
match val {
true => 1,
false => 0,
}
}
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