Hello everyone, Good morning/afternoon/evening !
Win32, Windows XP Professional.
Openssl0.9.8k compiled with multithreading support.
I am using a blocking BIO to read and write to an SSL socket using two
threads (because it is in blocking mode).
There is the Reading thread:
while (true)
BIO_read( m_pBio, pBuffer, i_iLength );
and concurrently, the writing thread that do something like this:
BIO_write( m_pBio, i_rStream.operator unsigned char *(),
i_rStream.GetLength() );
The SSL_ctx and SSL_session are created from within the Writing thread and
to stop the connection, the writing thread do:
BIO_reset()
and the Reading thread stops by getting an invalid return value from the
BIO_read function.
This is all very basic, and it is working but I am aware of the "OpenSSL
multithreading (or not so) things" and I would like to know if this basic
stuff needs some form of synchronization (using THREAD_setup() and
THREAD_cleanup()). At the same time if I use some form of synchronization
with blocking BIO how can I be free to use BIO_write and send info async if
the Reading thread is blocked in BIO_read and holding the mutex ? I guess
that SSL wisely will use the functions callbacks to access the internal
structures thread-safely, but isn't there any possible way to end up in a
deadlock ?
Thank you a lot for your answers !!!!!
R.
