Re: [LMDB] Lockups with robust mutexes and crashing processes
Marcos-David Dione wrote:
"openldap-devel"
<openldap-devel-bounces(a)openldap.org> wrote on
25/11/2014 16:19:40:
> Fyi, this would not have been a bug in Solaris:
>
> https://docs.oracle.com/cd/E19253-01/816-5168/pthread-mutexattr-
> setrobust-np-3c/index.html
you mean, because of the phrase «When the owner of a mutex with
the PTHREAD_MUTEX_ROBUST_NP /robustness/ attribute dies, or when the
process containing such a locked mutex unmaps the memory containing the
mutex or performs one of the _exec(2)_
<https://docs.oracle.com/docs/cd/E19253-01/816-5167/exec-2/index.html>f...,
the mutex is unlocked.»? I'm not sure that when it says 'unmap' it means
'munmap()s'.
There is no other meaning of the word. A process-shared mutex must
reside in shared memory. When a process detaches from that shared
memory, it is unmapped.
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/