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Re: [LMDB] Lockups with robust mutexes and crashing processes

Marcos-David Dione wrote:
"openldap-devel" <openldap-devel-bounces@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)_
the mutex is unlocked.»? I'm not sure that when it says 'unmap' it means

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/