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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>ACE VERSION: 5.3.0.0<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>HOST MACHINE and OPERATING SYSTEM:<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> Windows server 2008 r2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>TARGET MACHINE and OPERATING SYSTEM, if different from HOST:</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>COMPILER NAME AND VERSION (AND PATCHLEVEL):<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> VS 2008 compiler<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>AREA/CLASS/EXAMPLE AFFECTED:<o:p></o:p></b></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:black"> [What example failed? What module failed to compile?]<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>DOES THE PROBLEM AFFECT:</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> OTHER (please specify)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> Our application is hanging<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>SYNOPSIS:</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span>DON’T_CALL instead NULL_MASK solved the issue<span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>DESCRIPTION:</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span>We are using ACE_Reactor pattern to register and take the reaction on certain handles.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">We are using remove handler with NULL_MASK to remove the handle forcefully at destructor from ace internal handler as follows<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">HttpCommand::~HttpCommand()<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Courier New"">{</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> thePReactor->remove_handler(<span style="color:blue">this</span>->m_shutDownEvent->handle(),ACE_Event_Handler::NULL_MASK);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">int</span><span style="font-size:10.0pt;font-family:"Courier New""> HttpCommand::handle_close (ACE_HANDLE handle, ACE_Reactor_Mask
close_mask)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> UNREFERENCED_PARAMETER(close_mask);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> UNREFERENCED_PARAMETER(handle);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> ACE_DEBUG((LM_DEBUG,<span style="color:#A31515">"HttpCommand::handle_close \n"</span>));<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> m_safeToDestructEvent.signal();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">return</span> 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in">The call back <span style="font-size:10.0pt;font-family:"Courier New"">
handle_close() </span>should be invoked when we remove handler with NULL_MASK. In one of the use case this doesn’t happen and our application is hanging as shown in below call stack<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">and we don’t see that call back gets invoked at these times(When app hangs)<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Changing the reactor mask type to <b>
<span style="font-size:10.0pt;font-family:"Courier New"">DONT_CALL </span></b>has fixed this issue. I don’t see hanging any more . Can you please let me know what happens in background when the reactor type is NULL_MASK and the reason for app hang?<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Does this wait for any process mutex to invoke handle_close callback.?<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">When we use DON’T_CALL instead NULL_MASK it solved the issue but we need to know what’s the issue in depth. Please let us know if you have any information on same<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">KERNELBASE!WaitForSingleObjectEx+98<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">aced!ACE_Guard<ACE_Process_Mutex>::ACE_Guard<ACE_Process_Mutex>+21 [f:\views\isitepacs\trunk\thirdparty\ace_wrappers\ace\synch_t.i @ 36]<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
<b>REPEAT BY:</b><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[What you did to get the error; include test program or session<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">transcript if at all possible. ]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:black"> SAMPLE FIX/WORKAROUND:<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:10.0pt;font-family:"Courier New";color:black">[If available ]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">
</span>When we use DON’T_CALL instead NULL_MASK it solved the issue but we need to know what’s the issue in depth. Please let us know if you have any information on same<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Gudugunta, Sukumar <br>
<b>Sent:</b> Tuesday, July 14, 2015 4:33 AM<br>
<b>To:</b> 'ace-users@list.isis.vanderbilt.edu'<br>
<b>Subject:</b> Need help to resolve the hang with ACE Reactor usage<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are using ACE_Reactor pattern to register and take the reaction on certain handles.<o:p></o:p></p>
<p class="MsoNormal">We are using remove handler with NULL_MASK to remove the handle forcefully from ace internal handler as follows<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">thePReactor->remove_handler(<span style="color:blue">this</span>->m_shutDownEvent->handle(),ACE_Event_Handler::NULL_MASK);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">int</span><span style="font-size:10.0pt;font-family:"Courier New""> HttpCommand::handle_close (ACE_HANDLE handle, ACE_Reactor_Mask close_mask)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> UNREFERENCED_PARAMETER(close_mask);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> UNREFERENCED_PARAMETER(handle);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> ACE_DEBUG((LM_DEBUG,<span style="color:#A31515">"HttpCommand::handle_close \n"</span>));<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> m_safeToDestructEvent.signal();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">return</span> 0;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">The call back <span style="font-size:10.0pt;font-family:"Courier New"">
handle_close() </span>should be invoked when we remove handler with NULL_MASK. In one of the use case this doesn’t happen and our application is hanging as in attached call stack<o:p></o:p></p>
<p class="MsoNormal">and we don’t see that call back gets invoked at these times(When app hangs)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Changing the reactor mask type to <b><span style="font-size:10.0pt;font-family:"Courier New"">DONT_CALL
</span></b>has fixed this issue. I don’t see hanging any more . Can you please let me know what happens in background when the reactor type is NULL_MASK and the reason for app hang?<o:p></o:p></p>
<p class="MsoNormal">Does this wait for any process mutex to invoke handle_close callback.?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When we use DON’T_CALL instead NULL_MASK it solved the issue but we need to know what’s the issue in depth. Please let us know if you have any information on same<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards<o:p></o:p></p>
<p class="MsoNormal">Sukumar<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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