/usr/lib/nodejs/pend/index.js is in node-pend 1.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | module.exports = Pend;
function Pend() {
this.pending = 0;
this.max = Infinity;
this.listeners = [];
this.waiting = [];
this.error = null;
}
Pend.prototype.go = function(fn) {
if (this.pending < this.max) {
pendGo(this, fn);
} else {
this.waiting.push(fn);
}
};
Pend.prototype.wait = function(cb) {
if (this.pending === 0) {
cb(this.error);
} else {
this.listeners.push(cb);
}
};
Pend.prototype.hold = function() {
return pendHold(this);
};
function pendHold(self) {
self.pending += 1;
var called = false;
return onCb;
function onCb(err) {
if (called) throw new Error("callback called twice");
called = true;
self.error = self.error || err;
self.pending -= 1;
if (self.waiting.length > 0 && self.pending < self.max) {
pendGo(self, self.waiting.shift());
} else if (self.pending === 0) {
var listeners = self.listeners;
self.listeners = [];
listeners.forEach(cbListener);
}
}
function cbListener(listener) {
listener(self.error);
}
}
function pendGo(self, fn) {
fn(pendHold(self));
}
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