introduce dynamic shared memory registry
От | Nathan Bossart |
---|---|
Тема | introduce dynamic shared memory registry |
Дата | |
Msg-id | 20231205034647.GA2705267@nathanxps13 обсуждение исходный текст |
Ответы |
Re: introduce dynamic shared memory registry
Re: introduce dynamic shared memory registry Re: introduce dynamic shared memory registry Re: introduce dynamic shared memory registry Re: introduce dynamic shared memory registry |
Список | pgsql-hackers |
Every once in a while, I find myself wanting to use shared memory in a loadable module without requiring it to be loaded at server start via shared_preload_libraries. The DSM API offers a nice way to create and manage dynamic shared memory segments, so creating a segment after server start is easy enough. However, AFAICT there's no easy way to teach other backends about the segment without storing the handles in shared memory, which puts us right back at square one. The attached 0001 introduces a "DSM registry" to solve this problem. The API provides an easy way to allocate/initialize a segment or to attach to an existing one. The registry itself is just a dshash table that stores the handles keyed by a module-specified string. 0002 adds a test for the registry that demonstrates basic usage. I don't presently have any concrete plans to use this for anything, but I thought it might be useful for extensions for caching, etc. and wanted to see whether there was any interest in the feature. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com
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