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                # 4.4 event_base優先級 libevent支持為事件設置多個優先級。然而, event_base默認只支持單個優先級。可以調用 event_base_priority_init()設置 event_base 的優先級數目。 ```cpp int event_base_priority_init(struct event_base *base, int n_priorities); ``` 成功時這個函數返回 0,失敗時返回 -1。base 是要修改的 event_base,n_priorities 是要支 持的優先級數目,這個數目至少是 1 。每個新的事件可用的優先級將從 0 (最高) 到 n_priorities-1(最低)。 常量 EVENT_MAX_PRIORITIES 表示 n_priorities 的上限。調用這個函數時為 n_priorities 給出更大的值是錯誤的。 >必須在任何事件激活之前調用這個函數,最好在創建 event_base 后立刻調用。
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