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IDProjectCategoryView StatusDate SubmittedLast Update
0000400Hall D OnlineMonitoringpublic2014-04-08 10:442014-04-09 09:44
Assigned Todavidl 
PlatformOSOS Version
Summary0000400: ROOTSpy: Add mutex lock mechanism for coordinating with user
DescriptionSynchronization issues can (and sometimes do) occur when the RootSpy thread accesses a histogram or tree at the same time as the main program. We need to provide a mechanism by which they can coordinate. This should be a pthread_mutex_t so that it can be coupled easily with the existing mutex used in GlueX sim-recon code.

The DRootSpy constructor should take an optional pthread_mutex_t* that is initialized to NULL if not given. This will allow any existing code to still compile. A global variable:

   pthread_mutex_t *ROOTSPY_MUTEX = NULL;

should be created and set to the value passed to the DRootSpy constructor if present. If not, then a mutex should be allocated and the pointer set to that. In either case the RootSpy thread should then use the pointer to lock and unlock the mutex for ROOT operations.

 Users that don't provide the mutex pointer can automatically make use of the global ROOTSPY_MUTEX if they wish to synchronize. Otherwise, they are taking their own chances, which is what the situation is now!

TagsNo tags attached.
Work by outside group for Hall DNo
Estimated man-weeks
Percentage complete0
Actual man-weeks0
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davidl (administrator)
2014-04-09 09:44

This was checked in on 4/9/2014 as svn revision 13200.

- Issue History
Date Modified Username Field Change
2014-04-08 10:44 davidl New Issue
2014-04-08 10:44 davidl Work by outside group for Hall D => No
2014-04-08 10:44 davidl Percentage complete => 0
2014-04-08 10:44 davidl Actual man-weeks => 0
2014-04-08 11:10 davidl Summary RootSpy: Add mutex lock mechanism for coordinating with user => ROOTSpy: Add mutex lock mechanism for coordinating with user
2014-04-09 09:44 davidl Note Added: 0000585
2014-04-09 09:44 davidl Status new => resolved
2014-04-09 09:44 davidl Resolution open => fixed
2014-04-09 09:44 davidl Assigned To => davidl

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