Philippe Gerum wrote: > Jan Kiszka wrote: > >> Jan Kiszka wrote: >> >>> Jan Kiszka wrote: >>> >>>> Hi, >>>> >>>> something for the night: Can someone explain why normal pthreads can be >>>> restricted to initially use only the stack size provided via >>>> pthread_attr_setstacksize() while any rt-mapped thread (posix and >>>> native) refuse to accept this? For a simple test, compile the attached >>>> program one time as normal >>>> >>>> gcc -lpthread -o stacksize stacksize.c >>>> >>>> and the other time against xeno's posix skin >>>> >>>> gcc `xeno-config --posix-cflags` `xeno-config --posix-ldflags` \ >>>> -o stacksize.o stacksize.c >>>> >>>> Then compare the memory requirements of both processes - they should >>>> differ by 2M, the stack size when pthread_attr_setstacksize is not >>>> used. >>>> Strange - and also critical when considering larger applications... >>> >>> >>> This has been nailed down now to be some strange linker problem: while >>> the standard version of the stacksize demo calls the latest >>> pthread_create (__pthread_create_2_1 in glibc-2.3.x), the wrapped >>> real-time version and likely also applications linked against libnative >>> call an older pthread_create (__pthread_create_2_0). That variant >>> assumes that pthread_attr_t does not yet contain things like the stack >>> size and fills in the standard value again. :( >>> >>> Can anyone with another build environment than my SuSE 10 confirm this? >>> >>> >>>> So far I only tested against 2.1, but I don't see a reason why 2.0.x >>>> should behave different. Will get checked, though. >>>> >>> >>> Same behaviour on 2.0.x (SVN). >>> >>> Jan >>> >> >> >> The attached patch fixes this issue for 2.1-SVN. A similar patch should >> be applied to 2.0.x as well. And maybe it also hits the UVM, but this is >> something I cannot assess ATM. >> >> Well, you know, the smaller the bug... :-/ >> >> Jan >> >> >> PS: For those you are interested why we need this, read >> >> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=145941 >> >> Found via google:"pthread_create NOTYPE" after I noticed the differences >> in "readelf -s libnative.so". >> >> >> ------------------------------------------------------------------------ >> >> Index: src/skins/native/Makefile.am >> =================================================================== >> --- src/skins/native/Makefile.am (revision 243) >> +++ src/skins/native/Makefile.am (working copy) >> @@ -1,6 +1,6 @@ >> lib_LTLIBRARIES = libnative.la >> >> -libnative_la_LDFLAGS = -module -version-info 0:0:0 >> +libnative_la_LDFLAGS = -module -version-info 0:0:0 -pthread >> >> libnative_la_SOURCES = \ >> alarm.c \ >> Index: src/skins/posix/Makefile.am >> =================================================================== >> --- src/skins/posix/Makefile.am (revision 243) >> +++ src/skins/posix/Makefile.am (working copy) >> @@ -2,7 +2,7 @@ >> >> lib_LTLIBRARIES = libpthread_rt.la >> >> -libpthread_rt_la_LDFLAGS = -module -version-info 0:0:0 >> +libpthread_rt_la_LDFLAGS = -module -version-info 0:0:0 -lpthread >> >> libpthread_rt_la_SOURCES = \ >> init.c \ > > > Applied (with -pthread everywhere), thanks. >
Hmm, shouldn't is spell -lpthread? Seems like the autotools resolve this because it works with both versions for me (current posix/Makefile.in still has "-lpthread"). Jan
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