📄 8_6_2 线程池调度管理的编码实现 - 《多任务下的数据结构与算法》 - 免费试读 - book_csdn_net.htm
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style="FONT-SIZE: 9pt">CAPI_SUCCESS</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">表示成功</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">*/</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><STRONG><SPAN lang=EN-US
style="FONT-SIZE: 9pt">INT RecvQuest()</SPAN></STRONG></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">{</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> struct
sockaddr_in local, from</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> SOCKET s,
msgsock</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> int
fromlen</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> s =
socket(AF_INET, SOCK_STREAM, 0)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> if (s ==
INVALID_SOCKET)</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> {</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
return CAPI_FAILED</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> }</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
local.sin_family = AF_INET</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
local.sin_addr.s_addr = INADDR_ANY</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> local.sin_port
= htons(DEFAULT_PORT)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> if ( bind(s,
(struct sockaddr*)&local, sizeof(local)) == SOCKET_ERROR) </SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> {</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
return CAPI_FAILED</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> }</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> if ( listen(s,
MAX_LISTEN_SIZE ) == SOCKET_ERROR)</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> {</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
return CAPI_FAILED</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> }</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> while( msgsock
= accept(s, (struct sockaddr*)&from, &fromlen) </SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
!= INVALID_SOCKET )</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> {</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
SOCKET *pNewSock = new SOCKET</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
*pNewSock = msgsock</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
/* </SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">事实上可放更多信息到消息队列中，这里放一个</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 9pt">SOCK ID</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">示意一下</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> */</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
MsgQueue_Send(g_pQue, (void
*)pNewSock)</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> }</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> return
CAPI_SUCCESS</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">}</SPAN></P>
<P class=4 style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US>/**
</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">处理请求的任务处理函数，这个函数是处理任务的入口函数，在里面处理接收客户端</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> </SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">发来的字符串“</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">Hello!</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">”并发送响应“</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">OK</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">”到客户端</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> @param
void *</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋; LETTER-SPACING: -0.2pt">—</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋; LETTER-SPACING: -0.1pt">—</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">未使用</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> @return
void</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋; LETTER-SPACING: -0.2pt">—</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋; LETTER-SPACING: -0.1pt">—</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">无</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">*/</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><STRONG><SPAN lang=EN-US
style="FONT-SIZE: 9pt">void ProcessRequest(void *)</SPAN></STRONG></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">{</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> SOCKET
*pSock</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> while (pSock =
MsgQueue_Recv(g_pQue))</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> {</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
int len</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
char buf[1024]</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
len = recv(*pSock, buf, sizeof(buf)-1, 0)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
if ( len > 0 )</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
{</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
buf[len] = '\0'</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
if ( strcmp(buf, "Hello!")== 0 )</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
{</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
strcpy(buf, "Ok")</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
send(*pSock, buf, strlen(buf), 0)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
}</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">
}</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> }</SPAN></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 8pt; LINE-HEIGHT: 14pt"><SPAN
lang=EN-US style="FONT-SIZE: 9pt">}</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 华康简宋">可以看出，使用了消息队列后，整个线程池调度非常简单，由于本书中实现的消息队列在进行遍历时不会影响收发，因此可以实时查看有多少客户在线，使用消息队列的以下调用函数便可以实现对整个消息队列的遍历。</SPAN></P>
<P class=MsoNormal style="MARGIN: 8pt 0cm; LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">INT MsgQueue_EnumNext(MSGQUEUE *pQueue, VISITFUNC
VisitFunc)</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 华康简宋">这里只需要写一个访问函数</SPAN><SPAN
lang=EN-US>VisitFunc</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">即可，比如要想将当前所有在线的客户端连接</SPAN><SPAN lang=EN-US>SOCKET
ID</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">打印到图形界面中，可以写一个简单的访问函数来实现，编码如下。</SPAN></P>
<P class=4><SPAN lang=EN-US>INT PrintAllIDToScreen(void *pData)</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">{</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> SOCKET *pSock
= pData</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">WriteToScreen(*pSock)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> /* WriteToScreen</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">是将数据写到图形界面的函数</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> */</SPAN></P>
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