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List:       openldap-technical
Subject:    Re: Counter concurrency access
From:       Howard Chu <hyc () symas ! com>
Date:       2024-03-06 16:53:22
Message-ID: 83858c6a-b5b9-6268-e3cb-4ae6ec530dd9 () symas ! com
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Pascal Jakobi wrote:
> Hi there
> 
> I am creating a program that needs to increment a counter. Typically a serial \
> number has to be incremented every time I create a certificate. 
> The problem is to handle concurrent access. Fundamentally I need to 1/ read the \
> counter 2/ increment it. Therefore no one must be provided access to the counter \
> during these two operations. 
> Therefore I need to set a lock before the read operation and release it after the \
> update. Is there a way to do this with OL ? I am conscious of the ldapmodify \
> features thanks to Clement, however, this will not lock the read.

You don't need to do any locking, just use the ldapmodify Increment operator and the \
value will be incremented atomically.

-- 
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/


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