----- Original Message ----- From: "Darryl Miles" <[EMAIL PROTECTED]> To: <openssl-users@openssl.org> Sent: Friday, October 06, 2006 4:50 PM Subject: Re: Need help: Understanding SSL object in multi-threaded environment
> Mark wrote: > > I think it would be helpful for me. If we need to prevent calling > > SSL functions on the same object (i.e. SSL_read() and SSL_write()) > > from different threads then I would think that OpenSSL would not need > > any internal synchronisation, unless it creates its own threads > > internally. > > But you are allowed to have multiple threads each having their own SSL * > instance. You are allowed to make SSL_xxxxx() calls on two different > SSL * handles at the same time. > > The internal locking protects operations happening upon different > handles simultaneously. For example there is an SSL session cache that > can be shared between multiple SSL handles. Another example is the use > of SSL_CTX being used to stamp out new SSL *. It is allowed for your > application to allocate SSL_new(SSL_CTX *) from two threads at the same > time, yadda, yadda. > > But the SSL_xxxx() API set is not re-entrant with respect of the same > SSL * handle. So you have to serialize all API calls upon the same SSL > * handle. This is why you can't mix SSL_read() with any other > SSL_xxxx() API call on the same handle instance at the same time. > > Darryl Thank you very much everybody for your responses. The things are becoming more clear with these discussions. ~ Urjit DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Pvt. Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Pvt. Ltd. does not accept any liability for virus infected mails. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
