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IDProjectCategoryView StatusDate SubmittedLast Update
0025896Community[OCCT] OCCT:Modeling Algorithmspublic2015-03-05 16:222018-07-07 23:09
ReporterIstvan Csanady 
Assigned Toabv 
PrioritynormalSeverityminor 
StatusassignedResolutionopen 
PlatformOSOS Version
Product Version 
Target Version[OCCT] 7.4.0*Fixed in Version 
Summary0025896: UserBreak raising uncatchable exception in boolean operations
DescriptionWhen the parallel flag is true in BOPAlgo_PaveFiller, and the BOPAlgo_Algo::UserBreak() calls are raising Standard_NotImplemented exceptions and the exceptions can not be catched, since they are running from a new thread, and not embedded in try/catch blocks. This prevents the cancellation of boolean operations when running the pave filler parallel.
TagsNo tags attached.
Test case number
Attached Filesdiff file icon patch_parallel.diff (1,041 bytes) 2015-12-09 18:05

- Relationships
related to 0029935verifiedbugmaster Open CASCADE Foundation Classes - introduce OSD_ThreadPool class defining a thread pool 

-  Notes
(0039512)
msv (developer)
2015-04-09 16:49

Dear Istvan, do you work with OCCT compiled with TBB (HAVE_TBB is defined)? I think you do not, because in HAVE_TBB branch the code has try/catch block (see OSD_Parallel.hxx:268). It is just a question, anyway.
(0039513)
Istvan Csanady (developer)
2015-04-09 16:51

No, I am not using TBB.
(0039514)
abv (manager)
2015-04-09 16:54

Not sure whether it is relevant for this issue, but note that if you use custom signal handlers (e.g. OSD::SetSignal()), on some platforms this works on per-thread basis, thus handlers should be armed separately for each thread.
(0048916)
Istvan Csanady (developer)
2015-12-09 17:32

Patch is attached
(0048917)
msv (developer)
2015-12-09 17:54

Dear Istvan, the attached patch is relevant not to this bug, but rather to "Do not copy plane if Alt is 0.0 in BRepFill_OffsetWire".
(0048918)
Istvan Csanady (developer)
2015-12-09 18:05

corrected, sorry.
(0049008)
msv (developer)
2015-12-11 10:42

The proposed patch is not perfect.

1. It catches exception in the loop by tasks. It means that if user break event takes place the repetitive try/catch will hit on each iteration and the loop will continue till end. It is better to surround the whole loop into try block.

2. It hides all exceptions. I.e. if some exception not connected with user break takes place then the algorithm will continue working with some task left incomplete. This can lead to unpredictable results.

The right way is to implement mechanism that will allow catching exceptions in parallel tasks (i.e. in other threads), stop all other parallel executions (or simply stop scheduling new tasks) and re-throw exception when main thread takes control again. This way is implemented in TBB scheduler.

- Issue History
Date Modified Username Field Change
2015-03-05 16:22 Istvan Csanady New Issue
2015-03-05 16:22 Istvan Csanady Assigned To => msv
2015-03-10 10:28 msv Assigned To msv => azn
2015-03-10 10:28 msv Status new => assigned
2015-04-09 16:49 msv Note Added: 0039512
2015-04-09 16:49 msv Assigned To azn => Istvan Csanady
2015-04-09 16:49 msv Status assigned => feedback
2015-04-09 16:49 msv Target Version 6.9.0 => 7.1.0
2015-04-09 16:51 Istvan Csanady Note Added: 0039513
2015-04-09 16:54 abv Note Added: 0039514
2015-04-09 23:40 msv Assigned To Istvan Csanady => msv
2015-04-09 23:40 msv Status feedback => assigned
2015-12-09 17:32 Istvan Csanady File Added: patch.diff
2015-12-09 17:32 Istvan Csanady Note Added: 0048916
2015-12-09 17:54 msv Note Added: 0048917
2015-12-09 17:54 msv Assigned To msv => Istvan Csanady
2015-12-09 17:54 msv Status assigned => feedback
2015-12-09 18:05 Istvan Csanady File Added: patch_parallel.diff
2015-12-09 18:05 Istvan Csanady Note Added: 0048918
2015-12-09 18:33 msv File Deleted: patch.diff
2015-12-11 10:42 msv Note Added: 0049008
2016-10-26 11:56 msv Target Version 7.1.0 => 7.2.0
2017-07-20 17:13 msv Target Version 7.2.0 => 7.3.0
2018-02-25 21:09 abv Target Version 7.3.0 => 7.4.0*
2018-02-25 21:10 abv Assigned To Istvan Csanady => abv
2018-02-25 21:10 abv Status feedback => assigned
2018-07-07 23:09 abv Relationship added related to 0029935


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