boost asio，如何取消异步操作

本文介绍了boost asio，如何取消异步操作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我写了一个使用boost asio的代理服务程序，代理服务器有两个套接字（client_socket_，server_socket _），如果其中一个套接字断开另一个保持活动。例如，如果从client_socket_读取结果错误，我将关闭client_socket_，然后等待客户端重新连接，在客户端重新连接后，我从一个插槽读取并写入另一个。

I wrote a proxy service program that used boost asio, the proxy server has two socket(client_socket_,server_socket_)，If one of the socket is disconnected another one to remain active。For example, if read from client_socket_ results in error, i will close client_socket_ and then wait for client to reconnect and after client reconnects, I read from one socket and write to another.

问题是，当我关闭client_socket_如何在server_socket_中取消异步操作？如果我不这样做，以前的异步操作将在客户端连接后执行。以下是处理程序跟踪，处理程序19需要取消。

The problem is that, when i close the client_socket_ how to cancel the asynchronous operation in server_socket_? if i do not do this, the previous asynchronous operation will execute after client connected. The follow is handler tracking, handler 19 is need to cancel.

E:\code\vdoctor-r\code\dnc\Debug>forwardserver.exe @asio|1337591080.941830|0*1|socket@0012FA58.async_accept @asio|1337591107.009440|>1|ec=system:0 @asio|1337591107.009440|1*2|strand@003E8340.dispatch @asio|1337591107.009440|>2| @asio|1337591107.009440|2*3|socket@0012FAB0.async_connect @asio|1337591107.025059|2*4|socket@0012FA58.async_accept @asio|1337591107.025059|<2| @asio|1337591107.025059|<1| @asio|1337591107.025059|>3|ec=system:0 @asio|1337591107.025059|3*5|strand@003E8340.dispatch @asio|1337591107.025059|>5| 2012-May-21 17:05:07 [info]-[e:\code\vdoctor-r\code\dnc\forwardserver\forward_se rver.cpp(114):forward_server::handle_connect_to_server] connect to server succes sful, start to receive data from both sides @asio|1337591107.040678|5*6|socket@003E83D4.async_receive @asio|1337591107.040678|5*7|socket@0012FAB0.async_receive @asio|1337591107.040678|<5| @asio|1337591107.040678|<3| @asio|1337591107.040678|>6|ec=system:0,bytes_transferred=20 @asio|1337591107.040678|6*8|strand@003E8340.dispatch @asio|1337591107.040678|>8| @asio|1337591107.040678|8*9|socket@003E83D4.async_receive @asio|1337591107.040678|<8| @asio|1337591107.040678|<6| @asio|1337591107.040678|>9|ec=system:0,bytes_transferred=17 @asio|1337591107.040678|9*10|strand@003E8340.dispatch @asio|1337591107.040678|>10| @asio|1337591107.040678|10*11|socket@0012FAB0.async_send @asio|1337591107.056296|<10| @asio|1337591107.056296|<9| @asio|1337591107.056296|>11|ec=system:0,bytes_transferred=37 @asio|1337591107.056296|11*12|strand@003E8340.dispatch @asio|1337591107.056296|>12| @asio|1337591107.056296|12*13|socket@003E83D4.async_receive @asio|1337591107.056296|<12| @asio|1337591107.056296|<11| @asio|1337591107.071915|>7|ec=system:0,bytes_transferred=20 @asio|1337591107.071915|7*14|strand@003E8340.dispatch @asio|1337591107.071915|>14| @asio|1337591107.071915|14*15|socket@0012FAB0.async_receive @asio|1337591107.071915|<14| @asio|1337591107.071915|<7| @asio|1337591107.071915|>15|ec=system:0,bytes_transferred=18 @asio|1337591107.071915|15*16|strand@003E8340.dispatch @asio|1337591107.071915|>16| @asio|1337591107.071915|16*17|socket@003E83D4.async_send @asio|1337591107.071915|<16| @asio|1337591107.071915|<15| @asio|1337591107.087534|>17|ec=system:0,bytes_transferred=38 @asio|1337591107.087534|17*18|strand@003E8340.dispatch @asio|1337591107.087534|>18| @asio|1337591107.087534|18*19|socket@0012FAB0.async_receive @asio|1337591107.087534|<18| @asio|1337591107.087534|<17| @asio|1337591107.884087|>13|ec=asio.misc:2,bytes_transferred=0 @asio|1337591107.884087|13*20|strand@003E8340.dispatch @asio|1337591107.884087|>20| 2012-May-21 17:05:07 [error]-[e:\code\vdoctor-r\code\dnc\forwardserver\forward_s erver.cpp(273):forward_server::handle_read_header_from_client] read header from client error,End of file @asio|1337591107.884087|20|socket@003E83D4.close @asio|1337591107.884087|<20| @asio|1337591107.884087|<13| @asio|1337591222.813720|>4|ec=system:0 @asio|1337591222.813720|4*21|strand@003E8340.dispatch @asio|1337591222.813720|>21| @asio|1337591222.813720|21*22|socket@003ECF2C.async_receive @asio|1337591222.813720|21*23|socket@0012FAB0.async_receive @asio|1337591222.813720|21*24|socket@0012FA58.async_accept @asio|1337591222.813720|<21| @asio|1337591222.813720|<4| @asio|1337591222.813720|>22|ec=system:0,bytes_transferred=20 @asio|1337591222.813720|22*25|strand@003E8340.dispatch @asio|1337591222.813720|>25| @asio|1337591222.813720|25*26|socket@003ECF2C.async_receive @asio|1337591222.813720|<25| @asio|1337591222.813720|<22| @asio|1337591222.813720|>26|ec=system:0,bytes_transferred=17 @asio|1337591222.813720|26*27|strand@003E8340.dispatch @asio|1337591222.813720|>27| @asio|1337591222.813720|27*28|socket@0012FAB0.async_send @asio|1337591222.813720|<27| @asio|1337591222.813720|<26| @asio|1337591222.813720|>28|ec=system:0,bytes_transferred=37 @asio|1337591222.813720|28*29|strand@003E8340.dispatch @asio|1337591222.813720|>29| @asio|1337591222.813720|29*30|socket@003ECF2C.async_receive @asio|1337591222.813720|<29| @asio|1337591222.813720|<28| @asio|1337591222.813720|>19|ec=system:0,bytes_transferred=20 @asio|1337591222.813720|19*31|strand@003E8340.dispatch @asio|1337591222.813720|>31| @asio|1337591222.813720|31*32|socket@0012FAB0.async_receive @asio|1337591222.813720|<31| @asio|1337591222.813720|<19| @asio|1337591222.813720|>23|ec=system:0,bytes_transferred=18 @asio|1337591222.813720|23*33|strand@003E8340.dispatch @asio|1337591222.829340|>33| @asio|1337591222.829340|33*34|socket@0012FAB0.async_receive @asio|1337591222.829340|<33| @asio|1337591222.829340|<23|

推荐答案

唯一的可移动和可靠的方法，取消async.operations on server_socket_是关闭它。请参阅以下链接详情。

The only portable and reliable way to cancel async.operations on server_socket_ is to close it. See the following link for details.