Date: Thu, 19 Nov 1998 12:32:31 +0000 From: David Beck <DBECK@ludens.elte.hu> To: freebsd-hackers@FreeBSD.ORG Subject: SYSV Semaphores & mmap problems Message-ID: <Pine.VMS.3.91-vms-b4.981119121100.2524B-100000@ludens.elte.hu>
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Hi All,
this is my first turn up in this list, big Hi to All.
Sorry for sending mail outside from the list but the list
server ignores my mails from my regular account...
I ran into two problems with FreeBSD:
1., If I create a program with a few threads and then I block
one thread with a SYSV semaphore, then it blocks all threads.
Any ideas ?
2., My freebsd box rebooted after I managed to run a multi-process
server program which serves a readonly memory database mmaped by all
the running 'memory server' instnaces. The size of the db is about
20 Megs. It is an ordered array of key/value pairs and the program
actually using a binary search on it. After some investigation
I found that this came from these lines in i386/i386/pmap.c:
1461 if (!TAILQ_FIRST(&pv_freelist))
1462 panic("get_pv_entry: cannot get a pv_entry_t");
This really makes me wondering at first why does the kernel
reboot the whole system instead of signaling the process ?
Next, I'm wondering if there are any strategies to change this pv
interface in the future or it is the time to start hacking :) ?
Cheers,
David.
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