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                # Coroutine::getuid 獲取當前協程的唯一`ID` ``` function \Swoole\Coroutine::getuid() : int ``` > 僅在當前進程內唯一 返回值 ---- * 成功時返回當前協程`ID(int)` * 如果當前不在協程環境中,則返回`-1` ```php echo Swoole\Coroutine::getuid(); ``` cid分配機制 --- > [相關issue](https://github.com/swoole/swoole-src/issues/1977) cid map 使用了 bit map, 它在分配時總是會尋找下一個可用的比特位 我們可以通過以下代碼來確認這個事實: ```php co::set([ 'max_coroutine' => PHP_INT_MAX, 'log_level' => SWOOLE_LOG_INFO, 'trace_flags' => 0 ]); $map = []; while (true) { if (empty($map)){ $cid = go(function () {co::sleep(5);}); }else{ $cid = go(function () { }); } if (!isset($map[$cid])) { $map[$cid] = $cid; } else { var_dump(end($map)); var_dump($cid); exit; } } ``` 它將會打印: ```php int(524288) int(2) ``` 所以我們有 `MAX_CORO_NUM_LIMIT => 0x80000` 則在同一時間同一進程的協程數也不能超過 `524288` 雖然它的分配數量存在上限, 但這個數值非常大, 一個進程不可能同時存在這么多協程, 除非你有一臺超大內存的機器, 但那時候你也不必再擔心這個問題
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