NetBSD Problem Report #49529

From wiz@yt.nih.at  Sat Jan  3 09:35:54 2015
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Date: Sat,  3 Jan 2015 09:48:13 +0100 (CET)
From: Thomas Klausner <wiz@NetBSD.org>
Reply-To: Thomas Klausner <wiz@NetBSD.org>
To: gnats-bugs@NetBSD.org
Subject: pthread_mutexattr_setpshared and pthread_condattr_setpshared missing
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>Number:         49529
>Category:       lib
>Synopsis:       pthread_mutexattr_setpshared and pthread_condattr_setpshared missing
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 03 09:40:00 +0000 2015
>Last-Modified:  Thu Sep 24 23:35:00 +0000 2015
>Originator:     Thomas Klausner
>Release:        NetBSD 7.99.3
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:


Architecture: x86_64
Machine: amd64
>Description:
POSIX describes two sets of functions in the Threads extension that
are not provided on NetBSD:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_setpshared.html
http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_condattr_setpshared.html

These are used by e.g. libxshmfence.
>How-To-Repeat:
Try to compile libxshmfence.
>Fix:
Please implement them!

>Audit-Trail:
From: "Tobias Nygren" <tnn@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/49529 CVS commit: pkgsrc/x11/libxshmfence
Date: Thu, 24 Sep 2015 23:34:16 +0000

 Module Name:	pkgsrc
 Committed By:	tnn
 Date:		Thu Sep 24 23:34:16 UTC 2015

 Modified Files:
 	pkgsrc/x11/libxshmfence: DESCR Makefile distinfo
 Added Files:
 	pkgsrc/x11/libxshmfence/files: xshmfence_semaphore.c
 	    xshmfence_semaphore.h
 	pkgsrc/x11/libxshmfence/patches: patch-configure.ac
 	    patch-src_Makefile.am patch-src_xshmfence__alloc.c
 	    patch-src_xshmfenceint.h

 Log Message:
 Add makeshift NetBSD support using POSIX semaphores.

 Not upstreamed because I think NetBSD should be given the chance to
 implement some better interprocess synchronization primitives first.
 See PR lib/49529.

 In particular what's missing is an interprocess sync primitive that can:
   1) be passed safely through MAP_SHARED memory
   2) support atomic unlock-and-block (like pthread_cond_wait)
   3) wake up all waiters at once


 To generate a diff of this commit:
 cvs rdiff -u -r1.1 -r1.2 pkgsrc/x11/libxshmfence/DESCR \
     pkgsrc/x11/libxshmfence/distinfo
 cvs rdiff -u -r1.2 -r1.3 pkgsrc/x11/libxshmfence/Makefile
 cvs rdiff -u -r0 -r1.1 pkgsrc/x11/libxshmfence/files/xshmfence_semaphore.c \
     pkgsrc/x11/libxshmfence/files/xshmfence_semaphore.h
 cvs rdiff -u -r0 -r1.1 pkgsrc/x11/libxshmfence/patches/patch-configure.ac \
     pkgsrc/x11/libxshmfence/patches/patch-src_Makefile.am \
     pkgsrc/x11/libxshmfence/patches/patch-src_xshmfence__alloc.c \
     pkgsrc/x11/libxshmfence/patches/patch-src_xshmfenceint.h

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

>Unformatted:

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