iocp

前面的博文都是讲一些Libevent的一些辅助结构，现在来讲一下关键结构体：event_base。 这里作一个提醒，在阅读Libevent源码时，会经常看到backend这个单词。其直译是“后端”。实际上其指的是Libevent内部使用的多路IO复用函数，多路IO复用函数就是select、poll、epoll这类函数。本系列博文中，为了叙述方便，“多路IO复用函数”与“后端”这两种说法都会采用。 配置结构体： 通常我们获取event_base都是通过event_base_new()这个无参函数。使用这个无参函数，只能得到一个默认配置的event_base结构体。本文主要是讲一些怎么获取一个非默认配置的event_base以及可以对event_base进行哪些配置。 还是先看一下event_base_new函数吧。 //event.c文件 struct event_base * event_base_new(void) { struct event_base *base = NULL; struct event_config *cfg = event_config_new(); if (cfg) { base = event_base_new_with_config(cfg); event_config_free(cfg); } return base; } 可以看到

Libevent 的强大就不说了，但由于在window下使用的是 select 机制 ，除了效率低下意外还有一个讨厌的"FD_SETSIZE"限制,所以一直 希望能支持IOCP，可是现在已经到2.0还是没能够支持。 无意中在网上发现了个支持IOCP的libevent版本，是1.4.7版的。不过没关系,把其中的一个关键文件"win32iocp.c"拷贝到最新的1.4.14b版本中，并在"event.c" 中修改: ..... #ifdef HAVE_POLL extern const struct eventop pollops; #endif #ifdef HAVE_EPOLL extern const struct eventop epollops; #endif #ifdef HAVE_WORKING_KQUEUE extern const struct eventop kqops; #endif #ifdef HAVE_DEVPOLL extern const struct eventop devpollops; #endif #ifdef WIN32 #ifndef _EVENT_NOIOCP extern const struct eventop win32iocpops; #endif extern const struct eventop win32ops;

The .NET / .NET Core Thread Pool uses two different categories of threads internally: worker threads and I/O Completion Port (IOCP) threads. Both are just usual managed threads, but used for different purposes. Via different APIs (e.g. Task.Start or ThreadPool.QueueUserWorkItem ) I can start CPU-bound async operations on the worker threads (which shouldn't block, otherwise the Thread Pool would probably create additional worker threads). But what about performing I/O-bound asynchronous operations? How do the IOCP threads behave exactly in these situations? Specifically, I have the following

Is there such a thing? It needs to be asynchronous (no Indy). Try HPScktSrvr - http://www.torry.net/pages.php?id=220#939383 These may or may not be what you are looking for, but worth a shot: Ararat Synapse - For Delphi 2009 support you need to get the latest from SVN. /n Software's IP*Works - Commercial, but very full featured. Good luck! Check http://voipobjects.com/index.php?page=delphi-iocp-library It is migrated iocpclasses.sourceforge.net (i'm an author). Enjoy :) 来源： https://stackoverflow.com/questions/1072510/delphi-tclientsocket-replacement-using-winsock2-and-iocp

I'm using IOCP on UDP socket, and the UDP socket may be closed in another thread. So, how can I free Per Socket Context and Per I/O Context which associated with SOCKET safely? When I close the socket, there will still be un-completed I/O request in kernel queue. If I free context just when socket closed, the GetQueueCompletionStatus may failed. Now, my question is when to free context? Len Holgate I use reference counting on all of my per socket and per I/O data structures. It makes this kind of thing easy as they are deleted when their references drop to 0. For some example code which shows