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https://issues.apache.org/jira/browse/XERCESC-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16610530#comment-16610530
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Roger Leigh commented on XERCESC-2153:
--------------------------------------

Putting some debug messages in WindowsFileMgr::fileOpen (called from 
BinFileInputStream from LocalFileInputSource), shows that the HRESULT is 
0x80070020 (sharing violation) which meets the hypothesis above.  The input 
file on stdin must be opened without FILE_SHARE_WRITE.  This isn't a bug in 
Xerces-C++, it's due to the way the CMake execute_process function sets up 
pipes for STDIN with read and write access.  I have created a ticket for that 
here which contains more details: 
https://gitlab.kitware.com/cmake/cmake/issues/18359

> Tests can fail on Windows when run in parallel
> ----------------------------------------------
>
>                 Key: XERCESC-2153
>                 URL: https://issues.apache.org/jira/browse/XERCESC-2153
>             Project: Xerces-C++
>          Issue Type: Improvement
>          Components: Samples/Tests
>    Affects Versions: 3.2.1
>         Environment: Windows 10 x64 with VS2017 x64 build of Xerces-C++ 3.2.2 
> prerelease.
>            Reporter: Roger Leigh
>            Assignee: Roger Leigh
>            Priority: Minor
>              Labels: test-fail, windows
>
> Tests always pass when run serially, so I don't see this as a blocker for 
> 3.2.2 unless it's indicative of a very long-standing problem internally in 
> Xerces rather than that the tests were not originally written with parallel 
> execution in mind.
> When running "ctest -jn" to run tests in parallel, tests can randomly fail.  
> Looks like an interaction between tests when run at the same time.  Some 
> resource contention?
> The following is a reduced testcase, where I've found two tests which 
> interact badly (there may be others).  Both are using personal.xml as input.
> {{D:\xerces-c-3.2.2\b>ctest -C Release -j 4 -R "DOMPrint3|StdInParse2"}}
> {{Test project D:/xerces-c-3.2.2/b}}
> {{ Start 66: DOMPrint3}}
> {{ Start 70: StdInParse2}}
> {{1/2 Test #66: DOMPrint3 ........................***Failed 0.07 sec}}
> {{2/2 Test #70: StdInParse2 ...................... Passed 0.08 sec}}{{50% 
> tests passed, 1 tests failed out of 2}}{{Total Test time (real) = 0.11 
> sec}}{{The following tests FAILED:}}
> {{ 66 - DOMPrint3 (Failed)}}
> {{Errors while running CTest}}
> I can't reproduce on Linux, so it may well be Windows-specific due to file 
> locking preventing multiple readers of a file?  Is it due to one process 
> having it held open on stdin while the other tries to open it.  Running 
> multiple StdInParse[123] tests or multiple DOMPrint[123] tests does not 
> result in failure.  But when the two are combined, it's always DOMPrint that 
> fails; is it the open mode being used?



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