| libevent features | Implementation |
| Cross-platform support | linux 、 windows 、 BSD 、 Solaris |
| memory pool management | Not implemented, only a custom interface is provided |
| IO multiplexing | Support epoll, poll, select, dev/poll, IOCP |
| IO buffer | support. evbuffer. The back node is twice the size of the previous node |
| multiple buffers | 支持。 writev、readev |
| Multiple bufferevents | 1. Socket-based bufferevent 2. Paired bufferevents 3. Filtered bufferevent (such as compressing, converting data) |
| zero-copy technology | support. sendfile, mmap |
| timed event | support. Default binary heap algorithm O(logN) Common timeout can be optimized, bidirectional link achieves O(1) event_base_init_common_timeout |
| signal event | support |
| DNS protocol | support |
| OpenSSL protocol | support |
| rate limit | support bufferevent_set_rate_limit Support group restrictions bufferevent_rate_limit_group_new |
Reference: LibEvent code reading -- multiple buffers and zero-copy technology
Libevent source code analysis-----evbuffer structure and basic operations