[ace-users] ace-users Digest, Vol 12, Issue 43

[Michael Carr]

ACE version: 5.5.1
Host: Intel PC, Fedora Core 5 Linux
Target: same

Thanks for the fast response (as usual) Doug.  I
checked to see if I had ACE_HAS_PTHREADS_UNIX98_EXT
defined, and it is, so I tried running
Upgradable_RW_Test, and it seemed to fail.  I did
uncomment out // #define RW_MUTEX which seemed
correct.

So, I caame up with my own trivial test:

#include "ace/RW_Thread_Mutex.h"

int ACE_TMAIN (int, ACE_TCHAR **)
{
#ifdef ACE_HAS_PTHREADS_UNIX98_EXT
    printf("ACE_HAS_PTHREADS_UNIX98_EXT defined.\n");
#else
    printf("ACE_HAS_PTHREADS_UNIX98_EXT not
defined!\n");
#endif

    ACE_RW_Thread_Mutex rw_mutex;

    rw_mutex.acquire_read();

    printf("acquired for read\n");

    int result = rw_mutex.tryacquire_write_upgrade();

    printf("tried upgrade, result = %d\n", result);
    perror(0);

    return 0;
}

The output of the test is as follows:

[mcarr at alien scratch]$ ./semTest
ACE_HAS_PTHREADS_UNIX98_EXT defined.
acquired for read
tried upgrade, result = -1
Device or resource busy

Anyone know what I am doing wrong?

Thanks in advance,

Michael Carr

--- ace-users-request at cse.wustl.edu wrote:

> Message: 4
> Date: Tue, 31 Jul 2007 12:24:26 -0500
> From: "Douglas C. Schmidt"
> <schmidt at dre.vanderbilt.edu>
> Subject: Re: [ace-users] Is
> ACE_Lock::tryacquire_write_upgrade()
> 	supported	on Linux?
> To: Michael Carr <mcarr92365 at yahoo.com>
> Cc: ace-users at cs.wustl.edu
> Message-ID:
>
<20070731172427.52DA41000A8 at tango.dre.vanderbilt.edu>
> 
> 
> Hi Michael,
> 
> Thanks for using the PRF.
> 
> >     ACE VERSION: 5.5.1
> 
> Please upgrade to ACE+TAO+CIAO x.5.9 (i.e., ACE
> 5.5.9, TAO 1.5.9, and
> CIAO 0.5.9), which you can download from
> 
> http://download.dre.vanderbilt.edu
> 
> under the heading: "Latest Beta Kit".
> 
> The DOC groups at Washington University, UC Irvine,
> and Vanderbilt
> University only provide "best effort" support for
> non-sponsors for the
> latest release, as described in
> 
>
http://www.dre.vanderbilt.edu/~schmidt/DOC_ROOT/ACE/docs/ACE-bug-process.html
> 
> Thus, if you need more "predictable" help for
> earlier versions of
> ACE+TAO, I recommend that you check out
> 
> http://www.dre.vanderbilt.edu/support.html
> 
> for a list of companies that will provide you with
> ACE+TAO commercial
> support.
> 
> >     HOST MACHINE and OPERATING SYSTEM:
> > Intel PC, Fedora Core 5 Linux
> > 
> >     TARGET MACHINE and OPERATING SYSTEM:
> > Same
> > 
> >     COMPILER NAME AND VERSION (AND PATCHLEVEL):
> > gcc v. 3.4.6
> >  
> > Someone at my organization said that this method
> is
> > not supported on Solaris, and asked me to double
> check
> > that it is supported on Linux.
> 
> This method is available natively if your OS
> platform supports 
> 
> ACE_HAS_PTHREADS_UNIX98_EXT
> 
> It's also available if you use the ACE rwlock
> emulation, which is set if
> you enable ACE_LACKS_RWLOCK_T.  This works on all OS
> platforms,
> including Solaris.




       
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