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From: Tom Lane <[email protected]>
To: Greg Burd <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Thomas Munro <[email protected]>
Subject: Re: Areas for Solaris support modernization
Date: Mon, 02 Mar 2026 15:28:06 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

"Greg Burd" <[email protected]> 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.

			regards, tom lane



Attachments:

  [text/x-diff] change-sema-API-for-Solaris.patch (1.6K, 2-change-sema-API-for-Solaris.patch)
  download | inline diff:
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"

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