Comments (1)
Wei-YB
commented on June 28, 2024
问题1
- Lobby中eventloop的逻辑是每次循环只处理一个事件，因为eventfd使用的是信号量模式，每次read会使val减一，如果val不为零在下一轮的eventloop中会继续触发POLLIN事件，此时可处理剩余的请求。
- 此处将eventfd作为一种信号机制，避免了每次popfront之前都要判空，减少了锁使用的频率。这里也确实存在优化的空间，即采用传统的通知机制，并且在eventloop中也维护一个list，当eventfd活跃时交换两个list，这样做可以最小程度的减少锁的争用，进一步提高效率。
问题2和3
- RPC JoinRoom的接口实现于Lobby,cc Line 79，在此函数调用中，只有当房间存在空位时，才会调用Room::JoinRoom函数，因此不会产生恶性bug，但问题中的isFull函数确实是没有必要的，可进行优化。
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