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Re: Globals Storage and Thread-safety

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: mkscott(at)sacadia(dot)com
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: Globals Storage and Thread-safety
Date: 2002-02-22 05:43:53
Message-ID: 200202220543.g1M5hrA26543@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
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mkscott(at)sacadia(dot)com wrote:
> 
> 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(at)sacadia(dot)com
> 

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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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