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Date:	Sat, 26 Mar 2011 11:33:27 +0100
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Subject:	Re: libgfortran3 respin : status and problem
From:	marco atzeri <marco DOT atzeri AT gmail DOT com>
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On Sat, Mar 26, 2011 at 10:45 AM, Corinna Vinschen  wrote:
> On Mar 26 06:56, marco atzeri wrote:
>> Hi,
>> I rebuilt lapack, qrupdate, octave and netcdf with the libgfortran3-4.3.=
4-4.
>>
>> ( If you wan to try them, install with
>> setup.exe -X =A0-O -s http://matzeri.altervista.org )
>>
>> lapack tests passed
>> netcdf also (i am not 100% sure)
>>
>> but testing qrupdate I catched another problem.
>> The test programs go in a never ending loop:
>>
>> =A037 =A0 15579 [main] tch1dn_sym 4300 fhandler_tty_slave::write: (746):
>> tty output_mutex: waiting -1 ms
>> =A031 =A0 15610 [main] tch1dn_sym 4300 fhandler_tty_slave::write: (746):
>> tty output_mutex: acquired
>> =A033 =A0 15643 [main] tch1dn_sym 4300 fhandler_tty_slave::write: (789):
>> tty output_mutex released
>
> That's not an endless loop as far as Cygwin is concerned. =A0When a
> process writes to the console, then every write is atomic. =A0To accompli=
sh
> that, a mutex is used, like this:
>
> =A0write()
> =A0{
> =A0 =A0acquire mutex
> =A0 =A0while (there's still something to write)
> =A0 =A0 =A0write it
> =A0 =A0release mutex
> =A0}
>
> So, what you see is a supposedly endless stream of calls to the write
> function. =A0Usually, if an error occurs, you would also see an error
> message. =A0The only reason you don't see it is if an error already
> occured in an earlier call to write. =A0The important would be prior to
> the endless loop then. =A0Maybe the testcase doesn't check for errors?
>
>
> Corinna

the test case is a normal Fortran program that call numerical functions and
print output with a really standard "write" command, nothing fancy.
It used to work fine with previous libgfortran3-4.3.4-3 and cygwin-1.7.7

---------------------------------------------------------
      write (*,*)
      write (*,*) 'testing Cholesky rank-1 downdate routines.'
      write (*,*) 'All residual errors are expected to be small.'
      write (*,*)

      n =3D 50
      write (*,*) 'sch1dn test:'
      call stest(n)
      write (*,*) 'dch1dn test:'
      call dtest(n)
      write (*,*) 'cch1dn test:'
      call ctest(n)
      write (*,*) 'zch1dn test:'
      call ztest(n)
-------------------------------------------------------------
     subroutine smdump(name,m,n,A,lda)
      character(*) name
      integer m,n,lda
      real A(lda,n)
      integer i,j
      write (*,1001) name
      do i =3D 1,m
        do j =3D 1,n
          write(*,1002) A(i,j)
        end do
        write(*,*)
      end do
------------------------------------------------------------------

The full source is here, and it is a very tiny lib
http://matzeri.altervista.org/cygwin-1.7/qrupdate/

May be a mutex problem in Fortran lib ?
We already had long time ago.... a "WRITE" problem

http://cygwin.com/ml/cygwin/2009-03/msg00428.html

Marco

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