Hello all, I am having significant issues with (near immediate) deadlock when trying to send data out a single openssl bufferevent from two separate threads. The individual threads themselves send complete messages with each write. This should present no real problem from a synchronization perspective. In fact, the code works flawlessly when using ordinary bufferevents (not ssl bufferevents).
Are there any known issues with writing to a single openssl bufferevent from multiple threads concurrently? Should I have the expectation of this working, presuming my code is written correctly? I believe I have initialized libevent and openssl correctly for multithreaded execution. Thanks, -John More info, for those interested: My code fails in the same manner on both OSX and Linux. Both are built with multithreaded libevent/openssl support. (Verified at build time, not programatically. What's a good way to test openssl itself to see if it was built thread safe? I have verified openssl is calling my locking routines with a variety of lock indexes and the like) I am running: SSL version: OpenSSL 1.0.1c 10 May 2012 Libevent version: 2.0.21-stable I have done the following: 1. Initialized openssl per Viega/Messier/Chandra, "Network Security with OpenSSL". (Before using any SSL.) 2. Initialized libevent with evthread_use_pthreads() (Before using any libevent- and verified result) 3. Use option BEV_OPT_THREADSAFE on the bufferevents being created. And the following, none of which should be required, and none of which helped: 1. Used a global mutex surrounding all calls to libevent. 2. called evbuffer_enable_locking() on both evbuffers associated with the bufferevent. And verified, for sanity: 1. The shared libraries I am loading are the libraries I expect the system to use. My server is simply openssl acting as server, using some simple genetated certificates. I would be happy to share my test code- but it is ~300ish lines due to (primarily) openssl and thread initialization. *********************************************************************** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-users in the body.
