Log of /trunk/escript/test/python/test_shared.py

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Modified Mon Mar 30 02:13:58 2009 UTC (10 years, 5 months ago) by jfenwick
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Change __url__ to launchpad site

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Modified Mon Feb 16 05:08:29 2009 UTC (10 years, 7 months ago) by jfenwick
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Copied from: branches/arrexp_2137_win_merge/escript/test/python/test_shared.py revision 2270
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Merging version 2269 to trunk

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Modified Wed Jan 14 00:23:39 2009 UTC (10 years, 8 months ago) by jfenwick
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In preparation for merging to trunk

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Added Wed Jan 14 00:15:00 2009 UTC (10 years, 8 months ago) by jfenwick
Original Path: branches/arrexp_2137_win/escript/test/python/test_shared.py
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Executive summary:

This commit adds copy on write checks to operations involving shared data. 

Changes:

new #defines:
~~~~~~~~~~~~~
Data.cpp has ASSIGNMENT_MEANS_DEEPCOPY (defaults to undefined).
Defining this will put the data = operator back to making deep copies instead
of sharing data (now the default.)

Data:
~~~~~
. Added exclusiveWrite method to copy the underlying data if it is shared.
. Some operators which took python objects now call the c++ versions intead of duplicating code.

DataAbstract and offspring:
~~~~~~~~~~~~~~~~~~~~~~~~~~~
. Added method to determine whether the data is currently shared.
. Added getVectorRO to children of DataReady.
. Added getTagRO.

. Operations which modify values in place (or return modifiable pointers) now use
a macro to check for sharing. In the case where a modification attempt is detected, it throws an exception. In the future, I will enable this only for debugging.

. This shold not really have been required but the compiler was not choosing the use the const version as I would have liked. Besides, this makes things explict.

. Moved (and de-inlined) getVector in DataConstant (It was virtual in a parent class).

Unit tests:
~~~~~~~~~~~
Added both python and c++ unit tests to check known cases of sharing and "inplace"
modification operations.

General:
~~~~~~~~
Removed some commented out code.