JavaScript内存模型
是的，我知道在 Javascript 中要求一个正式的内存模型是一项无望的任务，所以我满足于“所有浏览器都遵循这些规则”之类的东西。
我的问题如下：我必须以定义的时间间隔将事件发送到服务器，但这样做时事件可能会添加到我的数组中，即：
function storeEvent(event) {
// may be called at any time
storedEvents.push(event);
}
function broadcastEvents() {
if (storedEvents.length !== 0) {
var eventString = JSON.stringify(storedEvents);
storedEvents = [];
// send eventString to server
}
window.setTimeout(broadcastEvents, BROADCAST_TIMER);
}
那里存在明显的竞争条件，甚至没有考虑丢失的内存屏障。
该怎么办？这里真的缺少 Java 内存模型..
Yes I'm aware that asking for a formal memory model in Javascript is a hopeless undertaking, so I'm settling for "All browsers follow these rules" or something.
My problem is the following: I have to send events in a defined interval to a server, but events may be added to my array while doing so, i.e.:
function storeEvent(event) {
// may be called at any time
storedEvents.push(event);
}
function broadcastEvents() {
if (storedEvents.length !== 0) {
var eventString = JSON.stringify(storedEvents);
storedEvents = [];
// send eventString to server
}
window.setTimeout(broadcastEvents, BROADCAST_TIMER);
}
There's an obvious race condition in there and not even think of the missing memory barriers.
What to do? Really missing the Java memory model here..
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评论（1）
没有任何竞争条件。
浏览器中的所有 JavaScript 代码都是单线程的。
setTimeout回调将在 UI 线程上运行，同时不执行任何其他操作。There isn't any race condition.
All JavaScript code in the browser is single-threaded.
The
setTimeoutcallback will run on the UI thread while it isn't doing anything else.