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Date: Mon, 02 Mar 2026 15:40:56 -0500
From: "Greg Burd" <greg@burd.me>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: "PostgreSQL Hackers" <pgsql-hackers@lists.postgresql.org>,
 "Thomas Munro" <thomas.munro@gmail.com>
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Subject: Re: Areas for Solaris support modernization
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On Mon, Mar 2, 2026, at 3:28 PM, Tom Lane wrote:
> "Greg Burd" <greg@burd.me> writes:
>> I've started a build/test on "icarus" with your patch applied.  I'll let you know how it goes, hopefully that won't take as long now.
>
> Cool.  Here's also a patch to switch the semaphore API.
> I've tested both patches on OpenIndiana, but a confirmation
> from icarus would be good.

Roger, wilco.  As soon as the previous patch run finishes up I'll start another with this additive change set.

best.

-greg

> 			regards, tom lane
>
>
> diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
> index b4914faff1c..c1a3e5b779a 100644
> --- a/doc/src/sgml/runtime.sgml
> +++ b/doc/src/sgml/runtime.sgml
> @@ -1127,13 +1127,8 @@ projadd -c "PostgreSQL DB User" -K 
> "project.max-shm-memory=(privileged,8GB,deny)
>         </para>
> 
>         <para>
> -        Other recommended kernel setting changes for database servers 
> which will
> -        have a large number of connections are:
> -<programlisting>
> -project.max-shm-ids=(priv,32768,deny)
> -project.max-sem-ids=(priv,4096,deny)
> -project.max-msg-ids=(priv,4096,deny)
> -</programlisting>
> +        To run a very large server, or multiple servers concurrently, 
> you
> +        might also need to raise 
> <literal>project.max-shm-ids</literal>.
>         </para>
> 
>         <para>
> diff --git a/meson.build b/meson.build
> index ddf5172982f..40fbbbcd3fe 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -324,6 +324,7 @@ elif host_system == 'openbsd'
> 
>  elif host_system == 'sunos'
>    portname = 'solaris'
> +  sema_kind = 'unnamed_posix'
>    export_fmt = '-Wl,-M@0@'
>    # We need these #defines to get POSIX-conforming versions
>    # of many interfaces (sigwait, getpwuid_r, shmdt, ...).
> diff --git a/src/template/solaris b/src/template/solaris
> index a4d8d38a8f8..ea524fdb2bd 100644
> --- a/src/template/solaris
> +++ b/src/template/solaris
> @@ -1,4 +1,9 @@
>  # src/template/solaris
> 
> +# Prefer unnamed POSIX semaphores if available, unless user overrides choice
> +if test x"$PREFERRED_SEMAPHORES" = x"" ; then
> +  PREFERRED_SEMAPHORES=UNNAMED_POSIX
> +fi
> +
>  # Extra CFLAGS for code that will go into a shared library
>  CFLAGS_SL="-fPIC"
>
> Attachments:
> * change-sema-API-for-Solaris.patch