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From: Heikki Linnakangas <[email protected]>
To: Andres Freund <[email protected]>
Cc: Tristan Partin <[email protected]>
Cc: pgsql-hackers <[email protected]>
Cc: Thomas Munro <[email protected]>
Subject: Re: Refactoring backend fork+exec code
Date: Fri, 1 Dec 2023 01:36:13 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 30/11/2023 22:26, Andres Freund wrote:
> On 2023-11-30 01:36:25 +0200, Heikki Linnakangas wrote:
>>  From a96b6e92fdeaa947bf32774c425419b8f987b8e2 Mon Sep 17 00:00:00 2001
>> From: Heikki Linnakangas <[email protected]>
>> Date: Thu, 30 Nov 2023 00:01:25 +0200
>> Subject: [PATCH v3 1/7] Refactor CreateSharedMemoryAndSemaphores
>>
>> For clarity, have separate functions for *creating* the shared memory
>> and semaphores at postmaster or single-user backend startup, and
>> for *attaching* to existing shared memory structures in EXEC_BACKEND
>> case. CreateSharedMemoryAndSemaphores() is now called only at
>> postmaster startup, and a new AttachSharedMemoryStructs() function is
>> called at backend startup in EXEC_BACKEND mode.
> 
> I assume CreateSharedMemoryAndSemaphores() is still called during crash
> restart?

Yes.

>  I wonder if it shouldn't split three ways:
> 1) create
> 2) initialize
> 3) attach

Why? What would be the difference between create and initialize phases?

-- 
Heikki Linnakangas
Neon (https://neon.tech)

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