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For readability. It was a slight modularity violation to have fields in PGShmemHeader that were only used by the allocator code in shmem.c. And it was inconsistent that ShmemLock was nevertheless not stored there. Moving all the allocator-related fields to a separate struct makes it more consistent and modular, and removes the need to allocate and pass ShmemLock separately via BackendParameters. Merge InitShmemAccess() and InitShmemAllocation() into a single function that initializes the struct when called from postmaster, and when called from backends in EXEC_BACKEND mode, re-establishes the global variables. That's similar to all the *ShmemInit() functions that we have. Co-authored-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com> Discussion: https://www.postgresql.org/message-id/CAExHW5uNRB9oT4pdo54qAo025MXFX4MfYrD9K15OCqe-ExnNvg@mail.gmail.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.