On 04/27/2017 03:33 PM, Yuri Voinov wrote: > is it possible to get comprehensive example? FYI: This is an eCAP question, not a Squid-specific question; you also start discussing development. Such questions are better asked via eCAP support channels[1] rather than on squid-users: [1] http://www.e-cap.org/Support Virtually any eCAP adapter supports concurrent transactions. Concurrency is built into the API. Many adapters do not make costly/lengthy decisions so they do not need "threads" (just like many Squids do not need threads to process thousands of transactions concurrently). Some adapters that do make those lengthy decisions block the application process while others use multiple threads (or multiple processes) to minimize blocking. IIRC, the eCAP ClamAV adapter[2] uses threads to minimize blocking. You may use it as a comprehensive example. [2] http://www.e-cap.org/Downloads > Adapter sample is non-obvious, not complete (non-obvious where to put > mutex locking) and contains C-style rudiments (like external call, > pthread.h etc.). > > I think, this will be actual in 2017, with CMT world around. I doubt there are high-quality public adapters that use C++11 threading interfaces (if that is what you are looking for). Several aspects contribute to that, including: * There were no stable host applications that supported C++11 until recently and few are going to rewrite older working adapters just to add C++11 bells and whistles. * IIRC, initial attempts to use C++11 thread-related atomic APIs in Squid have failed due to poor compiler support (this is not related to eCAP but illustrates that you are talking about state-of-the-art features rather than something that is widely supported, used, and understood like pthreads). * The official libecap library itself is still using a couple of pre-C++11 components (and changing that is difficult[3,4]!). [3] https://bugs.launchpad.net/ecap/+bug/1595488 [4] https://bugs.launchpad.net/ecap/+bug/1595562 In summary, it may take some time for that C++11 threading technology to surface in eCAP adapters. HTH, Alex. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
