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firmware: implement mutexes.

This commit is contained in:
whitequark 2018-09-15 07:35:35 +00:00
parent cd61ee858c
commit 1990ab35d3
1 changed files with 22 additions and 0 deletions

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@ -265,6 +265,28 @@ impl<'a> Io<'a> {
}
}
pub struct Mutex(Urc<Cell<bool>>);
impl Mutex {
pub fn new() -> Mutex {
Mutex(Urc::new(Cell::new(false)))
}
pub fn lock<'a>(&'a self, io: Io) -> Result<MutexGuard<'a>, Error> {
io.until(|| !self.0.get())?;
self.0.set(true);
Ok(MutexGuard(&*self.0))
}
}
pub struct MutexGuard<'a>(&'a Cell<bool>);
impl<'a> Drop for MutexGuard<'a> {
fn drop(&mut self) {
self.0.set(false)
}
}
macro_rules! until {
($socket:expr, $ty:ty, |$var:ident| $cond:expr) => ({
let (sockets, handle) = ($socket.io.sockets.clone(), $socket.handle);