[WIP] Use a lock to protect access to collection from TROOT::GetListOfCleanups #67
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…ups() The protection of the collection returned from TROOT::GetListOfCleanups() was insufficient since thread related crashes could still occur. This commit protects all uses except for those from the GUI.
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unfortunately this is performance issue .. as this way of handling the problem basically serialize all destruction of object derived from TObject ... :( ... i.e. one need a performance read-write lock for a proper fix |
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CMS is seeing a crash originating from this container. |
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I am not surprised, this is a know problem. If the performance is acceptable for the CMS case, please use the patch. For the general case, we need more work on it. |
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How many TObjects get marked at 'kMustCleanup'? It is only under that condition that the lock will be taken in the destructor. |
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At the very least all objects associated with a TDirectory (including gROOT) and a TPad (most notably that mean histograms and trees). |
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ping^1 |
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I guess this relates to #596. Maybe it'd be worth rebasing this PR. |
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Can one of the admins verify this patch? |
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This patch will be superseded by work subsequent to #596 |
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@pcanal does it incl. cms-sw@308daba ? |
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Yes, this patch will (eventually) also be unnecessary (i.e. replaced by taking a read lock at this point that might be turned into a write lock as needed). |
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Ok, shall we close it then? |
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I will close this on another related PR when a proper replacement is uploaded. This will serve as a signal to the author to replace their temporary work-around. |
pcanal
changed the title
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Hi @pcanal, perhaps we can close this one already since it is superseded by the RWlock PRs you have been working on? |
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This is superseed by adding a thread-safe mode to some ROOT collection and updating the global lock to have a Read-Write behavior (and update RecursiveRemove and friends accordingly). |
The protection of the collection returned from TROOT::GetListOfCleanups()
was insufficient since thread related crashes could still occur. This
commit protects all uses except for those from the GUI.