libev

libev与libuv的区别 https://www.cnblogs.com/charlesblc/p/6341280.html 参考： http://blog.csdn.net/w616589292/article/details/46475555 libuv 和 libev ，两个名字相当相近的 I/O Library，最近有幸用两个 Library 都写了一些东西，下面就来说一说我本人对两者共同与不同点的主观表述。 高性能网络编程这个话题已经被讨论烂了。异步，异步，还是异步。不管是 epoll 也好， kqueue 也罢，总是免不了异步这个话题。 libev 是系统异步模型的简单封装，基本上来说，它解决了 epoll ， kqueuq 与 select 之间 API 不同的问题。保证使用 livev 的 API 编写出的程序可以在大多数 *nix 平台上运行。但是 libev 的缺点也是显而易见，由于基本只是封装了 Event Library，用起来有诸多不便。比如 accept(3) 连接以后需要手动 setnonblocking 。从 socket 读写时需要检测 EAGAIN 、 EWOULDBLOCK 和 EINTER 。这也是大多数人认为异步程序难写的根本原因。 libuv 则显得更为高层。 libuv 是 joyent 给 Node 做的一套 I/O

Regarding the C programming language... Part of the question at C/C++ Structure offset states that "& does not always point at the first byte of the first field of the structure" But looking over the "ANSI Rationale" at http://www.lysator.liu.se/c/rat/c5.html it states "no hole may occur at the beginning" in section 3.5.2.1 Structure and union specifiers. So I'm not sure if the "Rationale" is definitive but it does seem to contradict that part of that highly visible question. So, which is it? Is the first field of a C structure always guaranteed to be at offsetof 0? struct A { int x; }; struct

I'm creating a load tester that uses libev to create lots of open tcp connections to an app i'm working on. Currently it bombs out at 256 connections, due to the nofiles limit: ulimit -n 256 I can increase this to 1024 by doing the below: ulimit -n 1024 But i cannot increase it further. Ideally i want to set it to 1048576. It gives the following error: ulimit: open files: cannot modify limit: Invalid argument How can i increase the ulimit further on osx? (answer updated to use -S as several commenters suggested) $ sysctl kern.maxfiles kern.maxfiles: 12288 $ sysctl kern.maxfilesperproc kern