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ldap_result error

Hi all,
I have two processes running on the same PC  that receive data from an
LDAP server.
Each process opens a connection with a different "slapd" server  (i.e 
each server runs on a different PC) and launches  "search" requests at a
fixed rate (about 100 searches/s). Each process creates a thread that
polls the server responses using the API "ldap_result" the used macro

 When the two processes send the requestes one of the two "ldap_result"
return with error (-1) and the error is "Can't contact the LDAP server".
I tried to launch one processes and it works fine (the maximum measured
rate  is 800 searches/s). Also I launch the two processes alternating
the search requestes and it works fine.

It seems that the error happens only if the two process runs
simultaneously (I use a dual core PC). Thinking of a race condition
error , I used the libldap_r library to build process, but the error
still remains.

The openldap version is 2.3.27 both for slapd servers and the libraries.

Have anyone encountered a similar error ?

Thanks in advance for the reply