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A lightweight, dependency-free mutex for Userscripts that ensures **only one tab / context** runs a critical section at a time. It coordinates through `GM.setValue` + `GM_addValueChangeListener`, so it works across multiple tabs, iframes, and even separate scripts that share the same @name/@namespace storage.
当前为
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/554436/1687613/GM_lock.js
/**
*
* MIT License
*
*/
var GM_lock = async (tag, func) => {
const lockId = `${Date.now() + 1000000000000000}_${Math.floor(Math.random() * 9000 + 1000)}`;
let resolveFn, rejectFn, cid;
const promiseRet = new Promise((resolve, reject) => {
resolveFn = resolve;
rejectFn = reject;
});
let valids = new Set();
let listenerId = GM_addValueChangeListener(`GM_lock_changed::${tag}`, async (_key, _oldValue, newValue, _remote) => {
valids.add(newValue.split("_")[0]);
const keys = (await GM.listValues()).filter((key) => key.startsWith(`GM_lock::${tag}::`)).sort();
if (keys[0] === `GM_lock::${tag}::${lockId}`) {
GM_removeValueChangeListener(listenerId);
clearTimeout(cid);
await GM.setValue(`GM_lock_changed::${tag}`, `${lockId}_run_${Date.now()}`);
let res;
let err;
try {
res = await func();
} catch (e) {
err = e;
}
await GM.deleteValue(`GM_lock::${tag}::${lockId}`);
await GM.setValue(`GM_lock_changed::${tag}`, `${lockId}_del_${Date.now()}`);
err ? rejectFn(err) : resolveFn(res);
}
});
await GM.setValue(`GM_lock::${tag}::${lockId}`, "1");
await new Promise(resolve => setTimeout(resolve, 50)); // 可选：设置 delay 确保锁不会冲突.
await GM.setValue(`GM_lock_changed::${tag}`, `${lockId}_set_${Date.now()}`);
// 因旧记录，导致1秒内没触发，重设锁
cid = setTimeout(async () => {
const keys = (await GM.listValues()).filter((key) => key.startsWith(`GM_lock::${tag}::`)).sort();
for (const key of keys) {
if (key === `GM_lock::${tag}::${lockId}`) break;
let isValid = false;
for (const part of valids) {
if (key.includes(`${part}_`)) isValid = true;
}
if (isValid) break;
await GM.deleteValue(key);
}
valids.clear();
await GM.setValue(`GM_lock::${tag}::${lockId}`, "1");
await new Promise(resolve => setTimeout(resolve, 50)); // 可选：设置 delay 确保锁不会冲突.
await GM.setValue(`GM_lock_changed::${tag}`, `${lockId}_set_${Date.now()}`);
}, 1000);
return promiseRet;
};