Hi Glenn! On Tue, May 31, 2016 at 11:11 AM, Burkhardt, Glenn B UTAS <[email protected]> wrote: > The way the winpthreads code is writing, the Windows handle for the thread is > cleared when the thread is made detached. That means that the > pthread_setschedparam() call can't work. So thread priorities for detached > threads can only be set once, at thread creation, before the thread is > detached, or as part of the pthread_create() call. > > Is there a reason for this? For me, it's unexpected behavior.
I don't see anything in the pthreads documentation that makes clear whether this should be allowed or not. However, the error-code return values for pthread_setschedparam() does not list an error value for this situation, which perhaps is a hint that it should work. On the other hand, there does seem to be precedent for this not working. I found some documentation for DEC / VMS pthreads here: http://www.mi.infn.it/~calcolo/OpenVMS/ssb71/6493/6493p002.htm Quoting from paragraph 2.3.4: It is illegal for your program to attempt any operation on a detached thread or to use any information in the thread object associated with a detached thread. For instance, a thread cannot join on a detached thread, and your program cannot cancel a detached thread. So it sounds like the VMS implementation, at least, doesn't support calling pthread_setschedparam() on a detached thread. (I wonder if a detached thread calling pthread_setschedparam() on itself could be an edge case in some implementations.) Happy Hacking! K. Frank ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Mingw-w64-public mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
