Struct GlobalData

pub(crate) struct GlobalData {
    pub(crate) data: HalfLock<SignalData>,
    pub(crate) race_fallback: HalfLock<Option<Prev>>,
}

Lazy-initiated data structure with our global variables.

Used inside a structure to cut down on boilerplate code to lazy-initialize stuff. We don’t dare use anything fancy like lazy-static or once-cell, since we are not sure they are async-signal-safe in their access. Our code uses the Once, but only on the write end outside of signal handler. The handler assumes it has already been initialized.

Fields

data: HalfLock<SignalData>

The data structure describing what needs to be run for each signal.

race_fallback: HalfLock<Option<Prev>>

A fallback to fight/minimize a race condition during signal initialization.

See the comment inside register_unchecked_impl.

Implementations

impl GlobalData

pub(crate) fn get() -> &'static Self

pub(crate) fn ensure() -> &'static Self