Comments on: Using epoll() For Asynchronous Network Programming http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/ Yet Another Admin's blog Thu, 04 Feb 2010 07:58:50 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Jimmy the Geek http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-231808 Jimmy the Geek Fri, 19 Mar 2010 05:28:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-231808 When the client closes the connection you will get a read of 0 bytes. When the client closes the connection you will get a read of 0 bytes.

]]> By: addisu http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-230917 addisu Fri, 19 Mar 2010 01:22:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-230917 Great write up. I couldn't find a more detailed example than this. However, how do you know when a client closes a connection? It seems that you should be able to check your event against EPOLLHUP but the event number shown when a client closes is 0x5 while EPOLLHUP is defined as 0x10. So is there some bit masking I have to do? Thanks, Addisu Great write up. I couldn’t find a more detailed example than this. However, how do you know when a client closes a connection? It seems that you should be able to check your event against EPOLLHUP but the event number shown when a client closes is 0×5 while EPOLLHUP is defined as 0×10. So is there some bit masking I have to do?

Thanks,
Addisu

]]> By: slav0nic http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-230832 slav0nic Fri, 19 Mar 2010 13:35:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-230832 занимательно, надо будет py-epoll погонять) тем более сейчас джангу перевёл на асинхронный сервер который использует epoll В) кстати если не ошибаюсь, результатом C10K problem стал сервер lighttpd занимательно, надо будет py-epoll погонять)
тем более сейчас джангу перевёл на асинхронный сервер который использует epoll В)

кстати если не ошибаюсь, результатом C10K problem стал сервер lighttpd

]]> By: James http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-230781 James Fri, 19 Mar 2010 16:31:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-230781 actually "fd" is not "used" for epolling. The fd is passed separately to epoll_wait, the data structure is used for passing in any data the user requires. As it is a union structure writing to "void *ptr" will overwrite fd. This data structure is useful for passing in data that may be useful to the user of the data. For example you can cache data that has been gathered by the connection previously and then store this in a structure which the void *ptr points to. When more data is ready you then have access to the previously stored data which you can add to with the further communication. James actually “fd” is not “used” for epolling. The fd is passed separately to epoll_wait, the data structure is used for passing in any data the user requires. As it is a union structure writing to “void *ptr” will overwrite fd.

This data structure is useful for passing in data that may be useful to the user of the data. For example you can cache data that has been gathered by the connection previously and then store this in a structure which the void *ptr points to. When more data is ready you then have access to the previously stored data which you can add to with the further communication.

James

]]> By: Prashanth http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-230697 Prashanth Fri, 19 Mar 2010 06:32:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-230697 Hi, Thanks for the info for epoll. These are helpful. I had one question regarding the user data variable given as part of epoll_event structure. If only "fd" is used for epolling, why are u32/u64 and void pointers provided. thanks, Prashanth Hi,

Thanks for the info for epoll. These are helpful.

I had one question regarding the user data variable given as part of epoll_event structure.
If only “fd” is used for epolling, why are u32/u64 and void pointers provided.

thanks,
Prashanth

]]> By: Mr Mister http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-155421 Mr Mister Fri, 19 Mar 2010 19:08:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-155421 Sonny, Just use google's translator. CLick this link to see a translation (should help a little): http://translate.google.com/translate?hl=en&sl=zh-CN&u=http://zhoulifa.bokee.com/6081520.html&sa=X&oi=translate&resnum=9&ct=result&prev=/search%3Fq%3Depoll%2Bserver%26complete%3D1%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG Sonny,
Just use google’s translator. CLick this link to see a translation (should help a little):
http://translate.google.com/translate?hl=en&sl=zh-CN&u=http://zhoulifa.bokee.com/6081520.html&sa=X&oi=translate&resnum=9&ct=result&prev=/search%3Fq%3Depoll%2Bserver%26complete%3D1%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG

]]> By: Sonny http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-136844 Sonny Fri, 19 Mar 2010 08:29:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-136844 I found a website with an epoll example written by zhoulifa(zhoulifa@163.com). Its comments are in chinese, could anyone translate it/document it in english so it will be understood better? http://zhoulifa.bokee.com/6081520.html Btw, why must it avoid nonblocking on function handle_io_on_socket? It accessing db like MySQL nonblocking? I found a website with an epoll example written by zhoulifa(zhoulifa@163.com). Its comments are in chinese, could anyone translate it/document it in english so it will be understood better? http://zhoulifa.bokee.com/6081520.html

Btw, why must it avoid nonblocking on function handle_io_on_socket? It accessing db like MySQL nonblocking?

]]> By: MunkeN http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-134104 MunkeN Fri, 19 Mar 2010 13:42:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-134104 Eranga, yes. OT: Great tutorial, even though you never declared events. Well done Scoundrel. Eranga, yes.

OT: Great tutorial, even though you never declared events.
Well done Scoundrel.

]]> By: Eranga http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-111498 Eranga Fri, 19 Mar 2010 13:15:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-111498 Is it possible to use FD (file descriptor) meant for poll() with epoll()? Is it possible to use FD (file descriptor) meant for poll() with epoll()?

]]> By: Nathan Mickulicz http://kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/comment-page-1/#comment-109547 Nathan Mickulicz Fri, 19 Mar 2010 20:26:00 +0000 http://blog.kovyrin.net/2006/04/13/epoll-asynchronous-network-programming/#comment-109547 Not if you use the aio functions. Not if you use the aio functions.

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