Date: Tue, 14 Jan 2003 18:06:15 +1100 From: Tim Robbins <tjr@FreeBSD.org> To: Alfred Perlstein <bright@mu.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/lib/libc_r/man sem_init.3 Message-ID: <20030114180615.A91716@dilbert.robbins.dropbear.id.au> In-Reply-To: <20030114053331.GK33821@elvis.mu.org>; from bright@mu.org on Mon, Jan 13, 2003 at 09:33:31PM -0800 References: <200301140412.h0E4CXTa093756@repoman.freebsd.org> <20030114053331.GK33821@elvis.mu.org>
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On Mon, Jan 13, 2003 at 09:33:31PM -0800, Alfred Perlstein wrote: > * Tim J. Robbins <tjr@FreeBSD.org> [030113 20:12] wrote: > > tjr 2003/01/13 20:12:33 PST > > > > Modified files: > > lib/libc_r/man sem_init.3 > > Log: > > Sharing semaphores between processes works now, so remove the stale comments > > about it always returning EPERM. Document that ENFILE occurs when the > > limit on kernel semaphores is reached. > > Uh, they can't work. The code should be patched to return EPERM > for shared as: > > 1) we can't share pthread_mutexes/condvars between processes yet. > 2) we allocate the space this puts the actual data into private > heap memory so that even if you give the pointer to another process > it is meaningless unless they are sharing the same vmspace. > > I appreciate the other work you've done here, however in the future > please contact me so that this sort of useless work can be avoided. > I could have easily explained the problem had you contacted me first. Ok, I guess I didn't test it enough. I had separate procs sharing the same address space, and didn't have time to try doing it with SHM. I don't think we actually need to be able to share mutexes/condvars between processes, though, since the only time semaphores initialised with pshared != 0 are locked is in sem_destroy(). Anyway, I'll back out the last change to sem_init.3 until sem_t becomes a plain old struct. Tim To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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