01.11.2017 21:23, Alex Rousskov пишет: > On 11/01/2017 03:20 AM, Christof Gerber wrote: > >> [Will Squid] be blocked until the eCAP API call returns? > To answer the exact question above: Yes, the Squid worker making an eCAP > API call will block until that call returns. The same is true for all > other API calls, all system calls, and all internal calls. This is how > C/C++ works. I am stating the obvious for the record, in case somebody > with a different (or insufficient) programming languages background > stumbles upon this thread. > > What you are really asking, I suspect, is whether Squid or the eCAP > library uses threads to automatically make eCAP adapter operations > asynchronous to the primary Squid operations. The answer to that > question is "no": The relevant Squid code does not use threads, and > there are no threads in the eCAP library code. > > Also, there is no magical layer between Squid and 99% of eCAP calls -- > Squid calls go directly to your eCAP adapter code and vice versa. IIRC, > the only (unimportant) exception to that "direct calls" observation is > the eCAP service registry API, where there is a thin eCAP layer > insulating the adapter from the host application. That layer is also > synchronous though. > > >> Is there a way other than >> programming the eCAP adapter in asynchronous mode? > I do not think there is a better alternative. AFAICT, you only have two > options: > > A) Change Squid to move eCAP calls to thread(s). > B) Use threads inside the adapter to make its operations asynchronous. Also I see no way to exchange between adapter and host with signals related partial body processing in async manner. > > As you know, the sample async adapter and the ClamAV adapter use (B). > That approach has its problems (because it currently does not require > the host application to be threads-aware), but it works reasonably well > for many use cases. > > > Cheers, > > Alex. > _______________________________________________ > squid-users mailing list > squid-users@xxxxxxxxxxxxxxxxxxxxx > http://lists.squid-cache.org/listinfo/squid-users -- ************************** * C++: Bug to the future * **************************
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