Hi all! I'm porting cmake to interix for use in my company. It seems to work quite well on single core machines. however, when it comes to multicore, interix has several severe bugs. fixing those may (better: _will_) take a lot of time. in the meantime i'm trying to hack around things.
i'm currently stuck with a rather big problem (or two...): cmakes implementation of how child processes are handled doesn't work reliably on multicore interix. it seems that every other SIGCHLD is lost somewhere on the way. i (printf-)debugged cmake a little during bootstrap, and it seems that at random points in time, SIGCHLD is lost, and cmake locks up in a select() call on the signal pipe (SIGCHLD is lost, so nobody will write on the signal pipe). i tried to hardcode a 5 seconds timeout if none is set, and that makes cmake move on (although of course that one step where it hung fails, since i hit a timeout :]). what i need now, is a guru for this process handling code, who can tell me what's the most easy way to hack around loosing signals (i.e. don't use them anomore :)), without re-writing all of the process handling code (again). i thought of introducing some lame timeout when select()ing the signal pipe, then checking whether the process is still alive (wait()), and again selecting if it is. what do you think? one more word to say: although interix is running on top of the windows kernel, i don't have access to the win32 api, so i can't reuse the win32 code. the second problem i have is regarding a broken select(). i tried to work around it by setting KWSYSPE_USE_SELECT, which initially didn't work, because the code seems b0rked. it seems that there is a wrong timeout check in that code path. first kwsysProcessGetTimeoutLeft is called, like in the select() code path, but directly after that, the timeoutLength members are checkd seperately once more. with this check it seems that all sub-processes "time out" immediately. if i comment this check, it works fine (although the above random SIGCHLD propblem persists of course). Need more info? I'll be glad to provide it ;) Thanks in advance for taking the time to help! Cheers, Markus _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
