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                # Atomic [TOC] swoole\_atomic是swoole擴展提供的原子計數操作類,可以方便整數的無鎖原子增減。 * `swoole_atomic`使用共享內存,可以在不同的進程之間操作計數 * `swoole_atomic`基于gcc提供的CPU原子指令,無需加鎖 * `swoole_atomic`在服務器程序中必須在`swoole_server->start`前創建才能在Worker進程中使用 * `swoole_atomic`默認使用`32`位無符號類型,如需要`64`有符號整型,可使用`Swoole\Atomic\Long` **注意:請勿在`onReceive`等回調函數中創建原子數,否則底層的`GlobalMemory`內存會持續增長,造成內存泄漏。** > `swoole_atomic`在`1.7.19`以上版本可用 > `Swoole\Atomic\Long`在`1.9.20`以上版本可用 ## 64位長整型 `1.9.20`版本增加了對64位有符號長整型原子計數的支持。使用`new Swoole\Atomic\Long`來創建。 * `Swoole\Atomic\Long`不支持`wait`和`wakeup`方法 ## 使用示例 ~~~ $atomic = new swoole_atomic(123); echo $atomic->add(12)."\n"; echo $atomic->sub(11)."\n"; echo $atomic->cmpset(122, 999)."\n"; echo $atomic->cmpset(124, 999)."\n"; echo $atomic->get()."\n"; ~~~
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