Hi, I am using openssl in a multithread application. I find the following descriptions in the OpenSSL FAQ file and it mentions the multithread applications must provide 2 callback functions to OpenSSL. Can someone explain that in more details? Which are the 2 callback functions? Thanks Patrick -- Extracted from the OpenSSL FAQ file --- * Is OpenSSL thread-safe? Yes (with limitations: an SSL connection may not concurrently be used by multiple threads). On Windows and many Unix systems, OpenSSL automatically uses the multi-threaded versions of the standard libraries. If your platform is not one of these, consult the INSTALL file. Multi-threaded applications must provide two callback functions to OpenSSL. This is described in the threads(3) manpage. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]