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                # 睡眠函數 最新的`4.2.0`版本增加了對`sleep`函數的`Hook`,底層替換了`sleep`、`usleep`、`time_nanosleep`、`time_sleep_until`四個函數。 當調用這些睡眠函數時會自動切換為協程定時器調度。不會阻塞進程。 實例 ---- ```php Swoole\Runtime::enableCoroutine(true); go(function () { sleep(1); echo "sleep 1s\n'; usleep(1000); echo "sleep 1ms\n" }); ``` 例外 --- 由于底層的定時器最小粒度是`1ms`,因此使用`usleep`等高精度睡眠函數時,如果設置為低于`1ms`時,將直接使用`sleep`系統調用。可能會引起非常短暫的睡眠阻塞。
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