Horton

add function for creating/attaching hash table in DSM registry

Nathan Bossart <nathandbossart@gmail.com>

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From: Nathan Bossart <nathandbossart@gmail.com>
To: pgsql-hackers@postgresql.org
Date: 2025-06-04T21:35:24Z
Lists: pgsql-hackers

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Libraries commonly use shared memory to store hash tables.  While it's
possible to set up a dshash table using the DSM registry today, doing so is
complicated; you need to set up two LWLock tranches, a DSA, and finally the
dshash table.  The attached patch adds a new function called
GetNamedDSMHash() that makes creating/attaching a hash table in the DSM
registry much easier.

-- 
nathan

Commits

  1. Fix cross-version upgrade test breakage from commit fe07100e82.

  2. Add GetNamedDSA() and GetNamedDSHash().

  3. Remove dynamic_shared_memory_type=none

  4. Introduce dynamic shared memory areas.

  5. Relax the requirement that all lwlocks be stored in a single array.