[Patches] [Developers] more efficient synchronisation of groups

[Thomas Radke]

Tom Goodale wrote:
> Looks good.  Just a few things to make the transition easier and safer:
> 
> * This will eventually completely replace the current overloading of 
> CCTK_SyncGroup, so the default CCTK_SyncGroup should now call 
> CCTK_SyncGroupByDirI.
> 
> * Overloading CCTK_SyncGroup should now produce a warning message saying 
> this is deprecated and they should overload CCTK_SyncGroupByDirI.
> 
> * The default for CCTK_SyncGroupByDirI should check for a NULL directions 
> array and then call CCTK_SyncGroup in a loop if CCTK_SyncGroup has been 
> overloaded.  (This code will disappear once CCTK_SyncGroup is no longer 
> overloadable.)
> 
> The intent of this is that drivers should only need to overload one of the 
> functions, we preserve the current behaviour for drivers which have not 
> been updated yet, and that we will be able to remove the overloading of 
> CCTK_SyncGroup once we are sure all drivers have converted to the new 
> mechanism.

Okay, here is a revised version of the patches, implementing Tom's 
suggestions from above plus a change in the prototypes for 
CCTK_SyncGroupsI() and CCTK_SyncGroupsByDirI() where the array arguments 
are now passed as 'CCTK_INT*' (rather than 'int*').

-- 
Cheers, Thomas.
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