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Date: Wed, 29 Apr 2009 05:01:40 -0700 (PDT)
From: Casull <aphex001 AT hotmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: GCC 4.4.0 - Can't activate threading support
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What can be done to add the pthread_mutex_timedlock function to the pthread
implementation of cygwin ? And what does the PTC achronyme mean ? :)


Dave Korn-6 wrote:
> 
> Dave Korn wrote:
>> Casull wrote:
>>> The GCC 4.4 implementation of std::thread is guarded by the
>>> following preprocessing directive:
>>>
>>>    #if defined(_GLIBCXX_HAS_GTHREADS) &&
>>> defined(_GLIBCXX_USE_C99_STDINT_TR1)
>>>
>>> When looking at the bits/c++config.h, _GLIBCXX_USE_C99_STDINT_TR1 is
>>> defined
>>> but _GLIBCXX_HAS_GTHREADS isn't.
>> 
>>   Ah.  There is an autoconf test in libstdc++-v3 that defines that, and
>> the
>> comment says:
>> 
>>> dnl Check if gthread implementation defines the types and functions
>>> dnl required by the c++0x thread library.  Conforming gthread
>>> dnl implementations can define __GTHREADS_CXX0X to enable use with
>>> c++0x.
> 
>   It fails because :
> 
> // In case of POSIX threads check _POSIX_TIMEOUTS too.
> #if (defined(_PTHREADS) && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS
> <= 0))
> #error
> #endif
> 
> 
> ... we don't have any definition of _POSIX_TIMEOUTS.  That's a feature
> test
> macro the exact definition of which I haven't found yet, but from
> libstdc's
> point of view, it appears to mean that the pthread_mutex_timedlock
> function is
> supported.  Which indeed Cygwin doesn't currently implement.
> 
> http://www.opengroup.org/onlinepubs/009695399/functions/pthread_mutex_timedlock.html
> 
>   Looks like it wouldn't be too hard to add, PTC I suppose.
> 
>     cheers,
>       DaveK
> 
> 
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