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Conference azur::mcc

Title:	DECmcc user notes file. Does not replace IPMT.
Notice:	Use IPMT for problems. Newsletter location in note 6187
Moderator:	TAEC::BEROUD

Created:	Mon Aug 21 1989
Last Modified:	Wed Jun 04 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6497
Total number of notes:	27359

5981.0. "Repository Ids of private MIR" by FRAIS::WELLERSHAUS (Heidi Wellershaus) Fri May 06 1994 08:49

As mentioned in note 5728 and 5594 of this conference we are
using the mcc_mir routines within our TBL-project very extensively
to store our instance- and attribute-data in the private MIR.

Creation of attribute- and instance-repositories is done with
the routine mcc_mir_create_repository of DECmcc V1.3.0 (ULTRIX)
with the appropriate repository types MCC_K_DB_FTYPE_ENTDEF
MCC_K_DB_FTYPE_ATTRIBUTE by our own FM and AM.

Doing this in parallel within two processes the following
problems occur:

Problem 1:
        start process 1         start process 2
        create inst-repos 1
        ==> repos_id = 10
        create inst-repos 2
        ==> repos_id = 11
                                create inst-repos 3
                                ==> repos_id = 12
        create inst-repos 4
        ==> repos_id = 12 (!!)
        create inst-repos 5
        ==> repos_id = 13
                                create inst-repos 6
                                ==> repos_id = 13 (!!)

We assume, that process 2 gets the right repos_id the first time
creating one repository, but after that numbering of the repos_id
is done seperately by each process, that means the same repos-ids are reused.
This causes confusing and unacceptable behaviour and inconsistence
of the stored data.

Problem 2:
        create inst-repos 1
        ==> repos_id = 22
                                create inst-repos 2
                                ==> repos_id = 23
        create attr-repos 4
        ==> repos_id = 23 (!!)    

Reading and writing of these repositories
causes the following return status:
MCC_S_WRONGREPOSTYPE 52876290

Is this bug known by anybody, is there a bug-fix?

Heidi

T.R Title User Personal
Name Date Lines

5981.1 Sounds like a bug. TAEC::LAVILLAT Mon May 09 1994 10:15 15

T.R	Title	User	Personal Name	Date	Lines
5981.1	Sounds like a bug.	TAEC::LAVILLAT		`Mon May 09 1994 10:15`	15
	Heidi, Your are not supposed to create MIR repositories very often, that is why maybe the access to the repository table is not well protected. I would suggest you enter a CLD for this problem, so that the MCC maintenance team is aware of it. I would also suggest that you work around the problem by doing the mutual exclusion yourself via flock or any other way. Regards. Pierre.

 Heidi,

  Your are not supposed to create MIR repositories very often, that is why
  *maybe* the access to the repository table is not well protected.

  I would suggest you enter a CLD for this problem, so that the MCC maintenance
  team is aware of it.

  I would also suggest that you work around the problem by doing the mutual
  exclusion yourself via flock or any other way.

  Regards.

  Pierre.