ÿþ<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=unicode" /> <meta http-equiv="Content-Language" content="en-us" /> <style> <!-- p.MsoNormal, li.MsoNormal {margin-top:0mm; margin-right:0mm; margin-bottom:10.0pt; margin-left:0mm; line-height:115%; font-size:12.0pt; font-family:"Times New Roman","serif";} a:link {color:blue; text-decoration:underline;} a:visited {color:purple; text-decoration:underline;} p {margin-right:0mm; margin-left:0mm; font-size:12.0pt; font-family:"Times New Roman","serif";} ol {margin-bottom:0mm;} --> </style> <title>Managing the multiple Windows Win32 system threads with working program example</title> <meta name="keywords" content="operating system, opensource system, technology, system programming, Win32 programming, Win32 library, server, computers, processors, hardware, microprocessors, online" /> <meta name="description" content="A program example on how to manage multiple threads in Windows operating system" /> </head> <body lang="EN-US" link="#0000FF" vlink="#800080" topmargin="20" leftmargin="20" rightmargin="20" bottommargin="20"> <div class="Section1"> <h3 align="center" style="margin-bottom:0mm;margin-bottom:0; text-align:center; margin-top:0"><font size="5" face="Byington"> <span style="line-height:115%;font-weight:400">Windows Thread Synchronization 48</span></font></h3> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:0; margin-top:0">&nbsp;</p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt">&nbsp;</p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt" align="center"> <script type="text/javascript"><!-- google_ad_client = "pub-8089415323104206"; google_ad_slot = "0761177910"; google_ad_width = 728; google_ad_height = 90; //--> </script> &nbsp;<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt">&nbsp;</p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt">&nbsp;</p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"><b> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height:115%; font-weight:bold">Managing Multiple Threads Program Example</span></font></b></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> In the next two examples, numerous threads are created that terminate at random times. Their termination and display messages are then caught to indicate their termination status.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"><b> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height:115%; font-weight:bold">Multiple Threads Example</span></font></b></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> Create a new empty Win32 console application project. Give a suitable project name and change the project location if needed.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" align="center" style="margin-bottom:0mm;margin-bottom:.0001pt; text-align:center"><font size="3" face="Arial"> <span style="font-size: 12.0pt;line-height:115%"> <img width="540" height="370" src="threadprocesssynchronizationapis11_files/winthreadprocesssynchronizationcode154.png" alt="Multiple Threads Example: Creating new Win32 C++ console application project" /></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> Then, add the source file and give it a suitable name.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" align="center" style="margin-bottom:0mm;margin-bottom:.0001pt; text-align:center"><font size="3" face="Arial"> <span style="font-size: 12.0pt;line-height:115%"> <img width="540" height="370" src="threadprocesssynchronizationapis11_files/winthreadprocesssynchronizationcode155.png" alt="Multiple Threads Example: Adding the C++ source file to the existing project" /></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> Next, add the following source code.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="blue" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:blue">#include</span></font><font size="3" face="Courier New"><span style="font-family:&quot;Arial&quot;"> <font color="#a31515"><span style="color:#A31515">&lt;Windows.h&gt;</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="blue" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:blue">#include</span></font><font size="3" face="Courier New"><span style="font-family:&quot;Arial&quot;"> <font color="#a31515"><span style="color:#A31515">&lt;stdio.h&gt;</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="blue" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:blue">#include</span></font><font size="3" face="Courier New"><span style="font-family:&quot;Arial&quot;"> <font color="#a31515"><span style="color:#A31515">&lt;time.h&gt;</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="#a31515" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:#A31515">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="blue" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:blue">#define</span></font><font size="3" face="Courier New"><span style="font-family:&quot;Arial&quot;"> NUM_THREADS 5</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">DWORD WINAPI thread_function(LPVOID arg)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">{</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">int</span></font> t_number = *(<font color="blue"><span style="color:blue">int</span></font> *)arg;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">int</span></font> rand_delay;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;thread_function() is running. Arg received was %u, thread ID is %u\n&quot;</span></font>, t_number, GetCurrentThreadId());</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="green"><span style="color:green">// Seed the random-number generator with</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="green"><span style="color:green">// current time so that the numbers will</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="green"><span style="color:green">// be different each time function is run.</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; srand((<font color="blue"><span style="color:blue">unsigned</span></font>)time(NULL));</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="green"><span style="color:green">// random time delay from 1 to 10</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rand_delay = 1 + (rand() % 10);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sleep(rand_delay*1000);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;Bye from thread #%d, ID %u\n&quot;</span></font>, t_number, GetCurrentThreadId());</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;\n&quot;</span></font>);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">return</span></font> 100;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">}</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" color="blue" face="Courier New"> <span style="font-family:&quot;Arial&quot;;color:blue">int</span></font><font size="3" face="Courier New"><span style="font-family:&quot;Arial&quot;"> wmain() </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">{</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HANDLE a_thread[NUM_THREADS];</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">int</span></font> multiple_threads, j;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">for</span></font>(multiple_threads = 0; multiple_threads &lt; NUM_THREADS; multiple_threads++)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="green"><span style="color:green">// Create a new thread.</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a_thread[multiple_threads] = CreateThread(NULL, 0, thread_function,(LPVOID)&amp;multiple_threads, 0,NULL);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">if</span></font> (a_thread[multiple_threads] == NULL)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;CreateThread() - Thread creation failed, error %u\n&quot;</span></font>, GetLastError());</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(EXIT_FAILURE);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sleep(1000);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;Waiting for threads to finish...\n&quot;</span></font>);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">for</span></font>(multiple_threads = NUM_THREADS - 1; multiple_threads &gt;= 0; multiple_threads--)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">if</span></font> (WaitForSingleObject(a_thread[multiple_threads],INFINITE) == WAIT_OBJECT_0)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;WaitForSingleObject() - Another thread signaled...\n&quot;</span></font>);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">else</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;WaitForSingleObject() failed, error %u\n&quot;</span></font>, GetLastError());</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;\n&quot;</span></font>);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">for</span></font>(j=0;j&lt;NUM_THREADS;j++)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">if</span></font>(CloseHandle(a_thread[j]) != 0)</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;a_thread[%u] handle was successfully closed!\n&quot;</span></font>, j);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="blue"><span style="color:blue">else</span></font></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;Failed to close a_thread[%u] handle, error %u\n&quot;</span></font>, j, GetLastError());</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; wprintf(L<font color="#a31515"><span style="color:#A31515">&quot;All done!\n&quot;</span></font>);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt;line-height: normal;text-autospace:none"><font size="3" face="Courier New"> <span style="font-family:&quot;Arial&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(EXIT_SUCCESS);</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Courier New"> <span style="line-height:115%; font-family:&quot;Arial&quot;">}</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> Build and run the project. The following screenshot is a sample output.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" align="center" style="margin-bottom:0mm;margin-bottom:.0001pt; text-align:center"><font size="3" face="Arial"> <span style="font-size: 12.0pt;line-height:115%"> <img width="573" height="415" src="threadprocesssynchronizationapis11_files/winthreadprocesssynchronizationcode156.png" alt="Multiple Threads Example: A sample of console program output in action" /></span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"><b> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height:115%; font-weight:bold">More: Synchronization Reference</span></font></b></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%"> The following constructs are used with synchronization in Windows. You should explore them when needed.</span></font></p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"><span style="font-size:12.0pt;line-height:115%">&nbsp;</span></font></p> <ol style="margin-top:0mm" start="1" type="1"> <li class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height: 115%"> <a href="http://msdn.microsoft.com/en-us/library/ms686360(VS.85).aspx">Synchronization Functions</a></span></font></li> <li class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height: 115%"> <a href="http://msdn.microsoft.com/en-us/library/ms686685(VS.85).aspx">Synchronization Structures</a></span></font></li> <li class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt"> <font size="3" face="Arial"> <span style="font-size:12.0pt;line-height: 115%"> <a href="http://msdn.microsoft.com/en-us/library/ms686362(VS.85).aspx">Synchronization Macros</a></span></font></li> </ol> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt">&nbsp;</p> <p class="MsoNormal" style="margin-bottom:0mm;margin-bottom:.0001pt">&nbsp;</p> <h3 align="center" style="margin-top: 0; margin-bottom: 0"> <script type="text/javascript"><!-- google_ad_client = "pub-8089415323104206"; google_ad_slot = "2156170134"; google_ad_width = 728; google_ad_height = 15; //--> </script> &nbsp;<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script></h3> <p align="center" style="margin-top: 0; margin-bottom: 0">&nbsp;</p> <h3 align="center" style="margin-top: 0; margin-bottom: 0"> <font face="Byington"><span style="font-weight: 400">&lt; <a title="The Windows thread Scheduling program example" style="color: blue; text-decoration: underline" href="threadprocesssynchronizationapis11_46.html"> Thread Synchronization 47</a> | <a title="The Windows Win32 thread synchronization techniques programming tutorials with program examples and code samples" style="color: blue; text-decoration: underline" href="threadprocesssynchronizationapis11index.html"> Thread Synchronization Programming</a> | <a title="The Win32 programming tutorial using Visual Studio, C and C++ languages" style="color: blue; text-decoration: underline" href="index.html"> Win32 Programming</a> | <a title="The Win32 programming tutorial on how to use the Windows process tool help APIs library" style="color: blue; text-decoration: underline" href="processtoolhelpapis12index.html"> Windows Process Tool Help APIs</a> &gt;</span></font></h3> <p align="left" style="margin-top: 0; margin-bottom: 0">&nbsp;</p> <div align="center"> <script src="http://tag.contextweb.com/TagPublish/getjs.aspx?action=VIEWAD&cwrun=200&cwadformat=728X90&cwpid=527221&cwwidth=728&cwheight=90&cwpnet=1&cwtagid=82740"></script> </div> </div> </body> </html>