openssl 加密，多线程的处理

UnixStudier

我在网络库封装了一个SendMessage()函数给库的使用者。SendMessage函数内部我对要发送的数据使用openssl的加密算法加密了。这个SendMessage函数是可能被多个线程调用的，请问需要作什么处理吗？

官方的常见问题集里这样说的：
（http://www.openssl.org/support/faq.html#PROG1）

       
1. 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.
从这里看不需要作什么特殊的处理了。

Multi-threaded applications must provide two callback functions to OpenSSL by calling CRYPTO_set_locking_callback() and CRYPTO_set_id_callback(), for all versions of OpenSSL up to and including 0.9.8[abc...]. As of version 1.0.0, CRYPTO_set_id_callback() and associated APIs are deprecated by CRYPTO_THREADID_set_callback() and friends. This is described in the threads(3) manpage.
（我用的openssl的版本是0.9.8.x），貌似还要再设置两个函数给openssl库？