【高级技巧】协程超时看门狗：长时间任务的自动终止封装

local function runWithWatchdog(fn, timeoutSec)
    local co = coroutine.create(fn)
    local startAt = os.time()
    local result = nil
    while coroutine.status(co) ~= "dead" do
        if os.time() - startAt > timeoutSec then
            sendmsg(nil, 1, "任务超时 " .. timeoutSec .. " 秒，已终止。")
            return false, nil
        end
        local ok, val = coroutine.resume(co)
        if not ok then
            sendmsg(nil, 1, "协程异常：" .. tostring(val))
            return false, nil
        end
        result = val
    end
    return true, result
end

local function batchScan(actor)
    actor = getplayerbyname(actor)
    local co = coroutine.create(function()
        local count = 0
        for i = 1, 2000 do
            count = count + 1
            if count % 200 == 0 then
                coroutine.yield(count)
            end
        end
        sendmsg(actor, 1, "扫描完成：" .. count .. " 条。")
    end)
    local startAt = os.time()
    while coroutine.status(co) ~= "dead" do
        if os.time() - startAt > 5 then
            sendmsg(actor, 1, "扫描超时终止。")
            break
        end
        coroutine.resume(co)
    end
end