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https://issues.apache.org/jira/browse/XERCESC-2179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16991923#comment-16991923
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martin goodall commented on XERCESC-2179:
-----------------------------------------
At this point, I agree the suggested changes are not the solution and the fault
causing the random seg. is elsewhere in the code. FYI, I converted my code to
use ICU instead of Win transcode and the seg happened in a similar fashion with
ICU on the stack instead of Win Transcode, but at the same memory handling
locations.
I have managed to work around the issue and have no more time to look at the
reported problem of a random seg, but the following information points to where
the problem is:-
Segment violation scenario.
program is multithreaded, but all Xerces usage is protected by a mutex
semaphore, so only one instance of Xerces is ever processing at once.
code performs (in thread)
1) request mutex
2) initialize Xerces
3) parse/process Xerces
4) terminate Xerces
5) release mutex
workaround scenario.
program is multithreaded, but all Xerces usage is protected by a mutex
semaphore, so only one instance of Xerces is ever processing at once.
1{color:#172b4d}) after main function, initialize Xerces{color}
code performs (in thread)
2) request mutex
3) parse/process Xerces (keep handles alive and reuse for duration of the
thread)
4) release mutex
after all threads finish...
{color:#172b4d}5) in main function, terminate Xerces{color}
{color:#172b4d}The web/documentation suggests both senarios should be valid
ways to code but the first causes random segs. This means that the Xerces
terminate function cannot be resetting all the globals/variables back to their
initial state.{color}
{color:#172b4d}I hope the info is useful and sorry I haven't had the time to
track down the actual issue.{color}
{color:#172b4d}mart{color}
> access violation in win32transservice.cpp with 64 bit compile
> -------------------------------------------------------------
>
> Key: XERCESC-2179
> URL: https://issues.apache.org/jira/browse/XERCESC-2179
> Project: Xerces-C++
> Issue Type: Bug
> Components: DOM
> Affects Versions: 3.2.2
> Reporter: martin goodall
> Assignee: Alberto Massari
> Priority: Blocker
> Fix For: 3.2.3
>
> Attachments: Win32TransService.cpp
>
>
> calls to ::Reg... to get registry info are passing in stack variables that
> are 8 bytes long into functions that overwrite 16 bytes, causing memory
> overwrite and very random segs.
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