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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
"use strict";
((window) => {
const core = window.Deno.core;
const {
Set,
SymbolFor,
TypeError,
} = window.__bootstrap.primordials;
function bindSignal(signo) {
return core.opSync("op_signal_bind", signo);
}
function pollSignal(rid) {
const promise = core.opAsync("op_signal_poll", rid);
core.unrefOp(promise[SymbolFor("Deno.core.internalPromiseId")]);
return promise;
}
function unbindSignal(rid) {
core.opSync("op_signal_unbind", rid);
}
// Stores signal listeners and resource data. This has type of
// `Record<string, { rid: number | undefined, listeners: Set<() => void> }`
const signalData = {};
/** Gets the signal handlers and resource data of the given signal */
function getSignalData(signo) {
return signalData[signo] ??
(signalData[signo] = { rid: undefined, listeners: new Set() });
}
function checkSignalListenerType(listener) {
if (typeof listener !== "function") {
throw new TypeError(
`Signal listener must be a function. "${typeof listener}" is given.`,
);
}
}
function addSignalListener(signo, listener) {
checkSignalListenerType(listener);
const sigData = getSignalData(signo);
sigData.listeners.add(listener);
if (!sigData.rid) {
// If signal resource doesn't exist, create it.
// The program starts listening to the signal
sigData.rid = bindSignal(signo);
loop(sigData);
}
}
function removeSignalListener(signo, listener) {
checkSignalListenerType(listener);
const sigData = getSignalData(signo);
sigData.listeners.delete(listener);
if (sigData.listeners.size === 0 && sigData.rid) {
unbindSignal(sigData.rid);
sigData.rid = undefined;
}
}
async function loop(sigData) {
while (sigData.rid) {
if (await pollSignal(sigData.rid)) {
return;
}
for (const listener of sigData.listeners) {
listener();
}
}
}
window.__bootstrap.signals = {
addSignalListener,
removeSignalListener,
};
})(this);
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