Globals Storage and Thread-safety
От | |
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Тема | Globals Storage and Thread-safety |
Дата | |
Msg-id | Pine.GSO.4.10.10202191135120.12782-200000@goldengate.kojoworldwide.com. обсуждение исходный текст |
Ответы |
Re: Globals Storage and Thread-safety
Re: Globals Storage and Thread-safety |
Список | pgsql-patches |
Hi All, This patch is to start up a globals storage environment and, in the future, thread-safety. It includes three new files: env/env.h -- Header for globals storage env/env.c -- Source for globals storage and creation env/thread.h -- Header for possible future thread implementation I created a new subsystem directory but they can go where appropriate. Implementation is very much like shared memory storage. The globals environment is a hashtable that stores stuctures for the various subsystems. Developers would be able to create structures to store and retrieve items that would normally be held in global variables. The hashtable is keyed by an int that identifies the specific global. I had to change dynahash.c to use MemoryContexts only if HASH_ALLOC and HASH_CONTEXT are not set in the control flags. I have included an example implementation for the MemoryContext globals. It uses #defines to redefine the globals to the stored structure if compiled with USE_GLOBAL_ENVIRONMENT. This is probably should be optimized to reduce the number of calls to retrieve storage but I will worry about that when and if the patch is accepted. Thanks, Myron Scott mkscott@sacadia.com
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