Experimental Physics and
Industrial Control System

> By coincidence I found a strange thing in src/db/dbCa.c. Some functions
> call epicsMutexUnlock(pca->lock) without taking the lock first.

I created a bug entry

https://bugs.launchpad.net/epics-base/+bug/794595

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
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Message content: TSPA

With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea. It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925


> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Dirk Zimoch
> Sent: Wednesday, June 08, 2011 7:54 AM
> To: [email protected]
> Subject: unsymmetrical mutex use in dbCa.c
> 
> Hi all (gurus especially)
> 
> By coincidence I found a strange thing in src/db/dbCa.c. Some functions
> call epicsMutexUnlock(pca->lock) without taking the lock first.
> 
> Example:
> 
> long epicsShareAPI dbCaGetNelements(
>      const struct link *plink,long *nelements)
> {
>      caLink    *pca;
> 
>      pcaGetCheck
>      *nelements = pca->nelements;
>      epicsMutexUnlock(pca->lock);
>      return(0);
> }
> 
> This looks quite wrong to me. Am I missing something or is this a bug?
> 
> These are the functions
> * dbCaGetNelements
> * dbCaGetSevr
> * dbCaGetTimeStamp
> * dbCaGetLinkDBFtype
> * dbCaGetControlLimits
> * dbCaGetGraphicLimits
> * dbCaGetAlarmLimits
> * dbCaGetPrecision
> * dbCaGetUnits
> 
> 
> Dirk

References:

unsymmetrical mutex use in dbCa.c Dirk Zimoch

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