2011/11/6 Ozkan Sezer <seze...@gmail.com>
> On Sun, Nov 6, 2011 at 3:31 PM, Ruben Van Boxem
> <vanboxem.ru...@gmail.com> wrote:
> > Hi,
> >
> > As promised, I am investigating the shared libstdc++ std::thread problem
> > with winpthreads. Basically, a simple "Hello from thread" test program
> > throws an "Operation not permitted" std::system_error exception, which is
> > most likely a result from winpthreads setting errno to EPERM. Test
> program
> > below:
> >
> > #include <iostream>
> > #include <thread>
> >
> > using namespace std;
> >
> > void f()
> > {
> > cout << "hello from thread!" << endl;
> > }
> >
> > int main()
> > {
> > thread t1(f);
> > thread t2(f);
> >
> > t1.join();
> > t2.join();
> > }
> >
> > Using any of my std::thread toolchains (4.6.3, 4.6.2-stdthread or
> > 4.7.0-stdthread) you can easily see that when not compiling this with
> > "-static", the program throws abovementioned exception.
> >
> > I did some looking into the issue, and came up with the following:
> > 1. There are 16 occurrences of EPERM in winpthreads (although not all are
> > return codes I think), in pthreads-win32, there are only 6 discernable
> > usages. This might be due to less correctness in pthreads-win32, but the
> > difference is at the very least noticeable.
> > 2. I recompiled winpthreads, disabling each EPERM usage on per-file
> basis,
> > messing up correct functionality, but hoping to disrupt some pthreads
> error
> > to libstdc++ exception conversion, but nothing there had any effect.
> > 3. Due to number 2, I'm now assuming there's some bad code in libstdc++,
> > resulting in always throwing an exception. Strange enough, Google popped
> up
> > this reverse situation for GCC 4.6 and Debian/glibc:
> >
> http://stackoverflow.com/questions/7090623/c0x-thread-static-linking-problem
> >
> > Could it be that in the libstdc++ dll, this function
> __ghtread_active_p() is
> > inlined in the dll (so to speak) to always cause this exception being
> thrown
> > due to some incompatibility with the assumed semantics of inline and
> dll's?
> >
> > I'd see if building a libstdc++ dll with debug info helps, but frankly,
> dll
> > debug info has always been disappointing in comparison to Linux so debug
> > info.
> >
> > Any thoughts on how to best proceed are much appreciated.
> >
> > Ruben
> >
> > PS: currently winpthreads is broken due to the recent pthread_time.h
> change:
> > In file included from
> >
> m:\development\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.6.3/../../../../x86_64-w64-mingw32/include/time.h:284:0,
> > from
> m:/Development/Source/mingw-w64/experimental/winpthreads/src/cond.c:29:
> >
> m:/Development/Source/mingw-w64/experimental/winpthreads/include/pthread_time.h:84:28:
> > error: expected '=', ',', ';', 'asm' or '__attribute__' before
> 'nanosleep'
> >
> m:/Development/Source/mingw-w64/experimental/winpthreads/include/pthread_time.h:86:28:
> > error: expected '=', ',', ';', 'asm' or '__attribute__' before
> > 'clock_nanosleep'
> > In file included from
> >
> m:\development\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/4.6.3/../../../../x86_64-w64-mingw32/include/time.h:284:0,
> > from
> m:/Development/Source/mingw-w64/experimental/winpthreads/src/cond.c:29:
> >
> m:/Development/Source/mingw-w64/experimental/winpthreads/include/pthread_time.h:87:28:
> > error: expected '=', ',', ';', 'asm' or '__attribute__' before
> > 'clock_getres'
> >
> m:/Development/Source/mingw-w64/experimental/winpthreads/include/pthread_time.h:88:28:
> > error: expected '=', ',', ';', 'asm' or '__attribute__' before
> > 'clock_gettime'
> >
> m:/Development/Source/mingw-w64/experimental/winpthreads/include/pthread_time.h:89:28:
> > error: expected '=', ',', ';', 'asm' or '__attribute__' before
> > 'clock_settime'
> > I reincluded <pthread.h> for the time being in that file, working around
> > this error. I notified Kai of this on IRC, but he hasn't responded yet,
> so
> > I'm repeating it here for the record.
>
> Rev. 4589 should fix it.
>
Wow, didn't notice the type :-/ Thanks!
>
>
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