From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp102.biz.mail.re2.yahoo.com (smtp102.biz.mail.re2.yahoo.com [68.142.229.216]) by ozlabs.org (Postfix) with SMTP id 7719BDDEBB for ; Sat, 1 Dec 2007 05:16:56 +1100 (EST) Message-ID: <47505206.9080605@qstreams.com> Date: Fri, 30 Nov 2007 13:10:14 -0500 From: Ben Warren MIME-Version: 1.0 To: Stuart Hodgson Subject: Re: Semaphores in eldk4.1 References: <47503B5A.6090604@quadrics.com> In-Reply-To: <47503B5A.6090604@quadrics.com> Content-Type: text/plain; charset=us-ascii; format=flowed Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , HI Stuart, Stuart Hodgson wrote: > Hi, > > I have been suing the eldk4.1 tool chain for a few months now and have > not not encountered any problems with building until now. I build for > two slightly different archs, ppc_85xx and ppx_82xx. > > The problem I have come up against is related to some of the semaphore > functions in semaphore.h, namely sem_wait, sem_post. This was originally > noticed in a third party driver I am porting from one board to another > but a small test program has shown the same results. > > Calls to these functions on the ppc_82xx platform return -1 with an > error code of 38, in this case meaning ENOSYS (not implemented). On the > ppc_85xx the same program executes fine, thus I conclude that it is > specific to the libc-2.3.5 for ppc_82xx. Has anyone else come across > this problem, I did find one thread but there was no conclusion listed. > > These work fine for me with ppc_6xx architecture and ELDK 4.1, although they didn't with ELDK 4.0. In that case, I was getting ENOSYS on sem_open() and sem_init(). Do these functions return 0 for you? I assume you're using a kernel that supports POSIX semaphores (I think that started at 2.6.12) and that you're using the glibc version of ELDK and not ulibc. > I also can not find anything stating that these functions are not > implemented for the 82xx arch compared with others for the eldk4.1 > > Thanks > > Stuart > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > regards, Ben