📄 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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<H1><A href="http://book.csdn.net/bookfiles/65">多任务下的数据结构与算法 </A></H1>
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线程池调度管理的编码实现</FONT></A></H1>
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线程池调度管理的基本概念</A></DIV>
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多任务下的垃圾收集</A></DIV></DIV></DIV></DIV>
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<H3 style="MARGIN-LEFT: 0cm; TEXT-INDENT: 0cm"><SPAN
lang=EN-US>8.6.2</SPAN><SPAN lang=EN-US> </SPAN><SPAN
style="FONT-FAMILY: 方正准圆简体">线程池调度管理的编码实现</SPAN></H3>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 华康简宋">下面以一个简单的服务器为例来实现上述算法。假设客户端向服务器发送一个“</SPAN><SPAN
lang=EN-US>Hello!</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">”字符串，服务器收到后判断一下是不是“</SPAN><SPAN
lang=EN-US>Hello!</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">”这个字符串，如果是则发回一个“</SPAN><SPAN lang=EN-US>OK</SPAN><SPAN
style="FONT-FAMILY: 华康简宋">”字符串给客户端。</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 华康简宋">下面给出线程池调度管理的编码实现。</SPAN></P>
<P class=4><SPAN lang=EN-US>#define
MAX_QUEUE_SIZE 4 096</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">#define
MAX_LISTEN_SIZE 16</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">#define
MAX_THREADS
10</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">#define
DEFAULT_PORT 8
080</SPAN></P>
<P class=4><SPAN lang=EN-US>MSGQUEUE *g_pQue</SPAN><SPAN
style="FONT-FAMILY: 宋体">；</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt">void ProcessRequest(void *args)</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN></P>
<P class=4><SPAN lang=EN-US>/** </SPAN><SPAN
style="FONT-FAMILY: 华康简宋">初始化函数，初始化时会先创建消息队列，并预创建</SPAN><SPAN
lang=EN-US>MAX_THREADS</SPAN><SPAN style="FONT-FAMILY: 华康简宋">个线程</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> @return
INT</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">返回</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">CAPI_FAILED</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">表示失败</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">返回</SPAN><SPAN lang=EN-US
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: 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">INT Init()</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"> INT
i</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"> g_pQue =
MsgQueue_Create(MAX_QUEUE_SIZE)</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 ( g_pQue ==
NULL )</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">
return CAPI_FAILED</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"> for ( i =
0</SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">i < MAX_THREADS</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">i++ )</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">
_beginthread(ProcessRequest, 0, NULL)</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: 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">接收请求的处理函数，实现将接收请求的</SPAN><SPAN
lang=EN-US>SOCKET</SPAN><SPAN style="FONT-FAMILY: 华康简宋">标识符放入到消息队列中</SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 14.3pt"><SPAN lang=EN-US
style="FONT-SIZE: 9pt"> @return
INT</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">返回</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt">CAPI_FAILED</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">表示失败</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">；</SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: 华康简宋">返回</SPAN><SPAN lang=EN-US
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