Type Alias DelayedDispatchToEventLoopCallback 

pub type DelayedDispatchToEventLoopCallback = Option<unsafe extern "C" fn(*mut c_void, *mut u8, u32) -> bool>;

Callback to dispatch a JS::Dispatchable to a JSContext’s thread’s event loop with a delay.

The DelayedDispatchToEventLoopCallback set on a particular JSContext must accept JS::Dispatchable instances and arrange for their run methods to be called after the given delay on the JSContext’s thread. This is used for cross-thread dispatch, so the callback itself must be safe to call from any thread. It cannot trigger a GC.

The embeddings must have its own timeout manager to handle the delay. If a timeout manager is not available for given context, it should return false, optionally with a warning message printed.

The callback accepts a closure that is the same as the one given by the call to JS::InitAsyncTaskCallbacks.

If the callback returns true, it must eventually run the given Dispatchable; otherwise, SpiderMonkey may leak memory or hang.

The callback may return false to indicate that the JSContext’s thread is shutting down and is no longer accepting runnables. Shutting down is a one-way transition: once the callback has rejected a runnable, it must reject all subsequently submitted runnables as well.

Aliased Type

pub enum DelayedDispatchToEventLoopCallback {
    None,
    Some(unsafe extern "C" fn(*mut c_void, *mut u8, u32) -> bool),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut c_void, *mut u8, u32) -> bool)

Some value of type T.