提高ASIO，如何取消异步操作 [英] boost asio,how to cancel an asynchronous operation

查看：135 发布时间：2016/8/12 18:27:57 c++ boost boost-asio

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问题描述

我写使用升压ASIO，代理服务器有两个插座代理服务程序（client_socket_，server_socket _）如果套接字中的一个断开另一个保持active.For例如，如果从在错误client_socket_结果读取我将关闭client_socket_，然后等待客户端重新连接和客户端重新连接后，我是从一个插座读取和写入到另一个。

的问题在于，当我关闭client_socket_如何取消异步操作
在server_socket_？如果我不这样做，客户端连接后，previous异步操作将被执行。后续的处理程序是跟踪，处理19是需要取消。

  E：\\ code \\ vdoctor-R \\ code \\ DNC \\调试和GT; forwardserver.exe
@asio | 1337591080.941830 | 0 * 1 | socket@0012FA58.async_accept
@asio | 1337591107.009440 |→1 | EC =系统：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 |＆LT; 1 |
@asio | 1337591107.025059 |→3 | EC =系统：0
@asio | 1337591107.025059 | 3 * 5 | strand@003E8340.dispatch
@asio | 1337591107.025059 |→5 |
2012年五月21 17点05分07秒[信息]  -  [E：\\ code \\ vdoctor-R \\ code \\ DNC \\ forwardserver \\ forward_se
rver.cpp（114）：forward_server :: handle_connect_to_server]连接到服务器更迭
sful，开始从两侧接收数据
@asio | 1337591107.040678 | 5 * 6 | socket@003E83D4.async_receive
@asio | 1337591107.040678 | 5 * 7 | socket@0012FAB0.async_receive
@asio | 1337591107.040678 |小于5 |
@asio | 1337591107.040678 | 3; |
@asio | 1337591107.040678 |→6 | EC =系统：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 |＆LT; 8 |
@asio | 1337591107.040678 | 6; |
@asio | 1337591107.040678 |＆GT; 9 | EC =系统：0，bytes_transferred = 17
@asio | 1337591107.040678 | 9 * 10 | strand@003E8340.dispatch
@asio | 1337591107.040678 |＆GT; 10 |
@asio | 1337591107.040678 | 10 * 11 | socket@0012FAB0.async_send
@asio | 1337591107.056296 |小于10 |
@asio | 1337591107.056296 |＆LT; 9 |
@asio | 1337591107.056296 |＆GT; 11 | EC =系统：0，bytes_transferred = 37
@asio | 1337591107.056296 | 11 * 12 | strand@003E8340.dispatch
@asio | 1337591107.056296 |＆GT; 12 |
@asio | 1337591107.056296 | 12 * 13 | socket@003E83D4.async_receive
@asio | 1337591107.056296 |＆LT; 12 |
@asio | 1337591107.056296 |＆LT; 11 |
@asio | 1337591107.071915 |大于7 | EC =系统：0，bytes_transferred = 20
@asio | 1337591107.071915 | 7 * 14 | strand@003E8340.dispatch
@asio | 1337591107.071915 |＆GT; 14 |
@asio | 1337591107.071915 | 14 * 15 | socket@0012FAB0.async_receive
@asio | 1337591107.071915 |＆LT; 14 |
@asio | 1337591107.071915 | 7; |
@asio | 1337591107.071915 |→15 | EC =系统：0，bytes_transferred = 18
@asio | 1337591107.071915 | 15 * 16 | strand@003E8340.dispatch
@asio | 1337591107.071915 |＆GT; 16 |
@asio | 1337591107.071915 | 16 * 17 | socket@003E83D4.async_send
@asio | 1337591107.071915 |＆LT; 16 |
@asio | 1337591107.071915 |＆LT; 15 |
@asio | 1337591107.087534 |＆GT; 17 | EC =系统：0，bytes_transferred = 38
@asio | 1337591107.087534 | 17 * 18 | strand@003E8340.dispatch
@asio | 1337591107.087534 |＆GT; 18 |
@asio | 1337591107.087534 | 18 * 19 | socket@0012FAB0.async_receive
@asio | 1337591107.087534 |＆LT; 18 |
@asio | 1337591107.087534 |＆LT; 17 |
@asio | 1337591107.884087 |＆GT; 13 | EC = asio.misc：2，bytes_transferred = 0
@asio | 1337591107.884087 | 13 * 20 | strand@003E8340.dispatch
@asio | 1337591107.884087 |→20 |
2012年五月21 17点05分07秒[错误]  -  [E：\\ code \\ vdoctor-R \\ code \\ DNC \\ forwardserver \\ forward_s
erver.cpp（273）：forward_server :: handle_read_header_from_client]读取头
文件的客户端错误，结束
@asio | 1337591107.884087 | 20 | socket@003E83D4.close
@asio | 1337591107.884087 |＆小于20 |
@asio | 1337591107.884087 |δ13 |
@asio | 1337591222.813720 |→4 | EC =系统：0
@asio | 1337591222.813720 | 4 * 21 | strand@003E8340.dispatch
@asio | 1337591222.813720 |＆GT; 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 |＆LT; 21 |
@asio | 1337591222.813720 | 4; |
@asio | 1337591222.813720 |＆GT; 22 | EC =系统：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 |α25 |
@asio | 1337591222.813720 |＆LT; 22 |
@asio | 1337591222.813720 |＆GT; 26 | EC =系统：0，bytes_transferred = 17
@asio | 1337591222.813720 | 26 * 27 | strand@003E8340.dispatch
@asio | 1337591222.813720 |＆GT; 27 |
@asio | 1337591222.813720 | 27 * 28 | socket@0012FAB0.async_send
@asio | 1337591222.813720 |＆LT; 27 |
@asio | 1337591222.813720 |＆LT; 26 |
@asio | 1337591222.813720 |＆GT; 28 | EC =系统：0，bytes_transferred = 37
@asio | 1337591222.813720 | 28 * 29 | strand@003E8340.dispatch
@asio | 1337591222.813720 |＆GT; 29 |
@asio | 1337591222.813720 | 29 * 30 | socket@003ECF2C.async_receive
@asio | 1337591222.813720 |＆LT; 29 |
@asio | 1337591222.813720 |＆LT; 28 |
@asio | 1337591222.813720 |＆GT; 19 | EC =系统：0，bytes_transferred = 20
@asio | 1337591222.813720 | 19 * 31 | strand@003E8340.dispatch
@asio | 1337591222.813720 |＆GT; 31 |
@asio | 1337591222.813720 | 31 * 32 | socket@0012FAB0.async_receive
@asio | 1337591222.813720 |＆LT; 31 |
@asio | 1337591222.813720 |所述19 |
@asio | 1337591222.813720 |＆GT; 23 | EC =系统：0，bytes_transferred = 18
@asio | 1337591222.813720 | 23 * 33 | strand@003E8340.dispatch
@asio | 1337591222.829340 |＆GT; 33 |
@asio | 1337591222.829340 | 33 * 34 | socket@0012FAB0.async_receive
@asio | 1337591222.829340 |γ-33 |
@asio | 1337591222.829340 |＆LT; 23 |

解决方案

要取消server_socket_ async.operations唯一的便携和可靠的方法是将其关闭。请参阅<一个href=\"http://www.boost.org/doc/libs/release/doc/html/boost_asio/reference/basic_stream_socket/cancel/overload2.html\"相对=nofollow>下面的详细信息链接。

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.

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|

解决方案

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

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