📄 4-1.htm
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<p class=MsoNormal align=right style='text-align:right'><a name="_top"></a><b><span
style='font-size:26.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:#993366'>实验</span></b><b><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:55.0pt;
mso-bidi-font-size:12.0pt;color:#993366'>4</span></i><span lang=EN-US
style='color:#993366'><o:p></o:p></span></b></p>
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</v:shape><![endif]--><![if !vml]><img width=729 height=46
src="4-1.files/image002.jpg" align=left hspace=12 v:shapes="_x0000_s1609"><![endif]><b><span
style='font-size:24.0pt;mso-bidi-font-size:12.0pt;font-family:黑体;mso-ascii-font-family:
"Times New Roman";color:navy'>并发与调度</span></b><b><span lang=EN-US
style='font-size:16.0pt;mso-bidi-font-size:12.0pt;mso-fareast-font-family:黑体;
color:navy'><span style='mso-spacerun:yes'> </span></span></b></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<h2><a name="_Toc16587483"></a><a name="_Toc36437026"></a><a name="_Toc37925076"></a><a
name="_Toc45704105"><span style='mso-bookmark:_Toc37925076'><span
style='mso-bookmark:_Toc36437026'><span style='mso-bookmark:_Toc16587483'><span
lang=EN-US>4.1<span style='mso-spacerun:yes'> </span>Windows 2000线程同步</span></span></span></span></a><span
style='mso-bookmark:_Toc16587483'></span></h2>
<p class=MsoNormal align=center style='text-align:center'><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US>(</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实验估计时间：</span><span
lang=EN-US>120</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>分钟</span><span lang=EN-US>)</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US> </span></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_背景知识"><span style='mso-bookmark:
_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>背景知识</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_实验目的"><span style='mso-bookmark:
_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>实验目的</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_工具/准备工作"><span
style='mso-bookmark:_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>工具</span><span
lang=EN-US>/</span></b></span><span style='mso-bookmark:_Toc16587483'><b><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>准备工作</span></b></span><span style='mso-bookmark:_Toc16587483'></span></a><span
style='mso-bookmark:_Toc16587483'><b><span lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_实验内容与步骤"><span
style='mso-bookmark:_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实验内容与步骤</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US> </span></span></p>
<h3><span style='mso-bookmark:_Toc16587483'><a name="_Toc36437027"></a><a
name="_Toc37925077"></a><a name="_Toc45704106"></a><a name="_背景知识"></a><span
style='mso-bookmark:_Toc36437027'><span style='mso-bookmark:_Toc37925077'><span
style='mso-bookmark:_Toc45704106'>背景知识</span></span></span></span></h3>
<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0'><span
style='mso-bookmark:_Toc16587483'><a name="_Toc36437028"><span lang=EN-US>Windows
2000</span></a></span><span style='mso-bookmark:_Toc16587483'><span
style='mso-bookmark:_Toc36437028'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>提供的常用对象可分成三类：核心应用服务、线程同步和线程间通讯。其中，开发人员可以使用线程同步对象来协调线程和进程的工作，以使其共享信息并执行任务。此类对象包括互锁数据、临界段、事件、互斥体和信号等。</span></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>多线程编程中关键的一步是保护所有的共享资源，工具主要有互锁函数、临界段和互斥体等；另一个实质性部分是协调线程使其完成应用程序的任务，为此，可利用内核中的事件对象和信号。</span></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>在进程内<span class=GramE>或进程</span>间实现线程同步的最方便的方法是使用事件对象，这一组内核对象允许一个线程对其<span
class=GramE>受信状态</span>进行直接控制</span><span lang=EN-US> (</span></span></span><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>见表</span><span lang=EN-US>4-1) </span></span></span><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";mso-ansi-language:FR'>而</span></span></span><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
class=GramE><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>互斥体则是</span></span></span></span><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>另一个可命名且安全的内核对象，其主要目的是引导对共享资源的访问。拥有单一访问资源的线程创建互斥体，所有想要访问该资源的线程应该在实际执行操作之前获得互斥体，而在访问结束时立即释放互斥体，以允许下一个等待线程获得互斥体，然后接着进行下去。</span></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>与事件对象类似，互斥体容易创建、打开、使用并清除。利用</span><span class=SpellE><span
lang=EN-US>CreateMutex</span></span><span lang=EN-US>() API</span></span></span><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>可创建互斥体，创建时还可以指定一个初始的拥有权标志，通过使用这个标志，只有当线程完成了资源的所有的初始化工作时，才允许创建线程释放互斥体。</span></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bookmark:_Toc36437028'><span lang=EN-US> </span></span></span></p>
<p class=a><span style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:
_Toc36437028'>表<span lang=EN-US>4-1 用于管理事件对象的API</span></span></span></p>
<div align=center>
<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0
style='margin-left:6.2pt;border-collapse:collapse;border:none;mso-border-top-alt:
solid windowtext 1.5pt;mso-border-bottom-alt:solid windowtext 1.5pt;
mso-padding-alt:0cm 5.4pt 0cm 5.4pt'>
<tr style='mso-yfti-irow:0;height:17.0pt'>
<td width=125 style='width:93.7pt;border-top:solid windowtext 1.5pt;
border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
mso-border-top-alt:solid windowtext 1.5pt;mso-border-bottom-alt:solid windowtext .5pt;
mso-border-right-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt;
height:17.0pt'>
<p class=MsoNormal align=center style='text-align:center'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
lang=EN-US style='font-size:9.0pt;font-family:黑体'>API名称<o:p></o:p></span></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'></span></span>
<td width=385 style='width:288.8pt;border-top:solid windowtext 1.5pt;
border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;
mso-border-left-alt:solid windowtext .5pt;mso-border-top-alt:solid windowtext 1.5pt;
mso-border-left-alt:solid windowtext .5pt;mso-border-bottom-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'>
<p class=MsoNormal align=center style='text-align:center'><span
style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'><span
style='font-size:9.0pt;font-family:黑体'>描述<span lang=EN-US><o:p></o:p></span></span></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'><span style='mso-bookmark:_Toc36437028'></span></span>
</tr>
<tr style='mso-yfti-irow:1;height:17.0pt'>
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