## Coroutine::getCid
獲取當前協程的唯一`ID`, 它的別名為`getUid`, 是一個進程內唯一的正整數
~~~
function \Swoole\Coroutine::getCid() : int
~~~
> 僅在當前進程內唯一
<br>
## 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`
~~~
echo Swoole\Coroutine::getCid();
~~~
<br>
## cid分配機制
在v4.2.9中, cid分配機制從有限的`cidmap+靜態表`更改為`unordered_map`, 底層的cid改為long類型, 分配方式為自增, 在PHP中最大值為`PHP_INT_MAX`, 在64位機器上其大小為`9223372036854775807`, 幾乎不存在重復的可能性, 可以作為真正的`unique id`而無需考慮cid在進程內的可能重復的問題.
- 序章
- 1.環境搭建
- PHP7源碼編譯安裝
- Swoole源碼編譯安裝
- Mysql5.7源碼安裝
- Redis安裝
- 2.搭建Echo服務器
- 3.Server服務器
- 函數列表
- Server::__construct
- Server->set
- Server->on
- Server->start
- Server->send
- WebSocket
- Server->push
- Server->exist
- Server::pack
- Server::unpack
- Server->disconnect
- Server->isEstablished
- 配置選項
- reactor_num
- worker_num
- max_request
- max_conn
- daemonize
- backlog
- log_file
- log_level
- upload_tmp_dir
- http_parse_post
- document_root
- http_compression
- 事件回調函數
- onStart
- onWorkerStart
- onConnect
- onReceive
- onPacket
- onRequest
- 請求Request
- Http\Request->$header
- Http\Request->$server
- Http\Request->$get
- Http\Request->$post
- Http\Request->$cookie
- Http\Request->$files
- Http\Request->rawContent
- Http\Request->getData
- 響應Response
- Http\Response->header
- Http\Response->cookie
- Http\Response->status
- Http\Response->redirect
- Http\Response->write
- Http\Response->sendfile
- Http\Response->end
- Http\Response->detach
- Http\Response::create
- onClose
- onOpen
- onMessage
- 創建服務器
- TCP服務器
- UDP服務器
- HTTP服務器
- WebSocket服務器
- 4.定時器Timer
- 5.進程Process
- Process::__construct
- Process->start
- Process->name
- Process->exec
- Process->write
- Process->read
- Process->setTimeout
- Process->setBlocking
- Process->useQueue
- Process->statQueue
- Process->freeQueue
- Process->push
- Process->pop
- Process->close
- Process->exit
- Process::kill
- Process::wait
- Process::daemon
- Process::signal
- 6.內存Memory
- Table
- Table->__construct
- Table->column
- Table->create
- Table->set
- Table->incr
- Table->decr
- Table->get
- Table->exist
- Table->count
- Table->del
- Channel
- Channel->__construct
- Channel->push
- Channel->pop
- Channel->stats
- 7.協程Coroutine
- Coroutine
- Coroutine::list
- Coroutine::set
- Coroutine::stats
- Coroutine::create
- Coroutine::exist
- Coroutine::getCid
- Coroutine::getContext
- Coroutine::defer
- Coroutine::getBackTrace
- Coroutine::yield
- Coroutine::resume
- Coroutine::fread
- Coroutine::fgets
- Coroutine::fwrite
- Coroutine::sleep
- Coroutine::gethostbyname
- Coroutine::getaddrinfo
- Coroutine::exec
- Coroutine::readFile
- Coroutine::writeFile
- Coroutine::statvfs
- Coroutine::getPcid
- Coroutine\Channel
- Coroutine\Channel->__construct
- Coroutine\Channel->push
- Coroutine\Channel->pop
- Coroutine\Channel->stats
- Coroutine\Channel->close
- Coroutine\Channel->length
- Coroutine\Channel->isEmpty
- Coroutine\Channel->isFull
- Coroutine\Channel->$capacity
- Coroutine\Channel->$errCode
- Coroutine\Client
- Coroutine\Client->connect
- Coroutine\Client->send
- Coroutine\Client->recv
- Coroutine\Client->close
- Coroutine\Client->peek
- Coroutine\Client->set
- Coroutine\Http\Client
- Coroutine\Http\Client->get
- Coroutine\Http\Client->post
- 其他
- 并行和并發的區別
- 堆、棧、隊列