(ITS#3409) libldap_r optimization

[raphael.ouazana@linagora.com]

Full_Name: Raphael Ouazana
Version: All
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (194.98.7.155)



On Linux and as indicated in RFC 3493, getaddrinfo must be thread-safe. So I
think it shouldn't be locked as it is now in os-ip.c

Not locking it brings really better performances for libldap_r and in particular
for back-ldap and back-meta.

I know that on some systems the implementation of getaddrinfo is not
thread-safe, but I think it should be considered as thread-safe by default, and
locked for particular cases where it is not (maybe by configure if it is
possible, or by hard coded #define else).

Raphael Ouazana.