Add a crude facility for dealing with relative pointers. C doesn't have any sort of built-in understanding of a pointer relative to some arbitrary base address, but dynamic shared memory segments can be mapped at different addresses in different processes, so any sort of shared data structure stored within a dynamic shared memory segment can't use absolute pointers. We could use something like Size to represent a relative pointer, but then the compiler provides no type-checking. Use stupid macro tricks to get some type-checking.
Patch originally by me. Concept suggested by Andres Freund. Recently resubmitted as part of Thomas Munro's work on dynamic shared memory allocation. Discussion: 20131205144434.gg12...@alap2.anarazel.de Discussion: CAEepm=1z5wlunoj80pacvz6etg9dn0j-kuhchtu6qefcpp5...@mail.gmail.com Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/fbc1c12a94a638cf4f577fef158175e22ab824a3 Modified Files -------------- src/include/utils/relptr.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
