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_("Make sure lock prevents calling with a shared lock");
// Utility that we only use here.
function do_check_begins(thing, startsWith) {
if (!(thing && thing.indexOf && thing.indexOf(startsWith) == 0)) {
do_throw(thing + " doesn't begin with " + startsWith);
}
}
add_task(async function run_test() {
let ret, rightThis, didCall;
let state, lockState, lockedState, unlockState;
let obj = {
_lock: Utils.lock,
lock() {
lockState = ++state;
if (this._locked) {
lockedState = ++state;
return false;
}
this._locked = true;
return true;
},
unlock() {
unlockState = ++state;
this._locked = false;
},
func() {
return this._lock("Test utils lock", async function () {
rightThis = this == obj;
didCall = true;
return 5;
})();
},
throwy() {
return this._lock("Test utils lock throwy", async function () {
rightThis = this == obj;
didCall = true;
return this.throwy();
})();
},
};
_("Make sure a normal call will call and return");
rightThis = didCall = false;
state = 0;
ret = await obj.func();
Assert.equal(ret, 5);
Assert.ok(rightThis);
Assert.ok(didCall);
Assert.equal(lockState, 1);
Assert.equal(unlockState, 2);
Assert.equal(state, 2);
_("Make sure code that calls locked code throws");
ret = null;
rightThis = didCall = false;
try {
ret = await obj.throwy();
do_throw("throwy internal call should have thrown!");
} catch (ex) {
// Should throw an Error, not a string.
do_check_begins(ex.message, "Could not acquire lock");
}
Assert.equal(ret, null);
Assert.ok(rightThis);
Assert.ok(didCall);
_("Lock should be called twice so state 3 is skipped");
Assert.equal(lockState, 4);
Assert.equal(lockedState, 5);
Assert.equal(unlockState, 6);
Assert.equal(state, 6);
});
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