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| 26 | <div class="titlepage"><div><div><h3 class="title"> |
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| 27 | <a name="threads.implementation_notes"></a>Implementation Notes</h3></div></div></div> |
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| 28 | <div class="toc"><dl><dt><span class="section"><a href="implementation_notes.html#threads.implementation_notes.win32">Win32</a></span></dt></dl></div> |
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| 30 | <div class="titlepage"><div><div><h4 class="title"> |
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| 31 | <a name="threads.implementation_notes.win32"></a>Win32</h4></div></div></div> |
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| 32 | <p> |
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| 33 | In the current Win32 implementation, creating a boost::thread object |
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| 34 | during dll initialization will result in deadlock because the thread |
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| 35 | class constructor causes the current thread to wait on the thread that |
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| 36 | is being created until it signals that it has finished its initialization, |
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| 37 | and, as stated in the |
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| 38 | <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/dllmain.asp" target="_top">MSDN Library, "DllMain" article, "Remarks" section</a>, |
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| 39 | "Because DLL notifications are serialized, entry-point functions should not |
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| 40 | attempt to communicate with other threads or processes. Deadlocks may occur as a result." |
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| 41 | (Also see <a href="http://www.microsoft.com/msj/archive/S220.aspx" target="_top">"Under the Hood", January 1996</a> |
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| 42 | for a more detailed discussion of this issue). |
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| 43 | </p> |
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| 44 | <p> |
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| 45 | The following non-exhaustive list details some of the situations that |
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| 46 | should be avoided until this issue can be addressed: |
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| 47 | </p> |
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| 48 | <div class="itemizedlist"><ul type="disc"> |
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| 49 | <li>Creating a boost::thread object in DllMain() or in any function called by it.</li> |
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| 50 | <li>Creating a boost::thread object in the constructor of a global static object or in any function called by one.</li> |
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| 51 | <li>Creating a boost::thread object in MFC's CWinApp::InitInstance() function or in any function called by it.</li> |
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| 52 | <li>Creating a boost::thread object in the function pointed to by MFC's _pRawDllMain function pointer or in any function called by it.</li> |
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| 53 | </ul></div> |
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| 54 | </div> |
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| 55 | </div> |
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| 56 | <table width="100%"><tr> |
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| 57 | <td align="left"><small><p>Last revised: July 17, 2004 at 04:33:59 GMT</p></small></td> |
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| 58 | <td align="right"><small>Copyright © 2001-2003 William E. Kempf</small></td> |
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