Re: [boost] [chrono] Thread clock compatibility problems on Android

Subject: Re: [boost] [chrono] Thread clock compatibility problems on Android
From: Libor Bus (libor.bus_at_[hidden])
Date: 2011-05-14 12:16:53

Vicente Botet wrote:
> 
> Is CLOCK_THREAD_CPUTIME_ID a macro on this platform? I would prefer to
> check if CLOCK_THREAD_CPUTIME_ID is defined and use it. Would it be the
> correct behavior?
> 

Yes, is defined like:
#define CLOCK_THREAD_CPUTIME_ID    3
in time.h.

Vicente Botet wrote:
> 
> could you try this patch
> 
> // chrono/config.hpp
> 
> #   if defined(_POSIX_THREAD_CPUTIME) && !defined(BOOST_DISABLE_THREADS)
> #     define BOOST_CHRONO_HAS_THREAD_CLOCK
> #     define BOOST_CHRONO_THREAD_CLOCK_IS_STEADY true
> #   endif
> #   if defined(CLOCK_THREAD_CPUTIME_ID) && !defined(BOOST_DISABLE_THREADS)
> #     define BOOST_CHRONO_HAS_THREAD_CLOCK
> #     define BOOST_CHRONO_THREAD_CLOCK_IS_STEADY true
> #   endif
> 

This causes compilation error because BOOST_CHRONO_THREAD_CLOCK_IS_MONOTONIC
is undefined in chrono/thread_clock.hpp:
    BOOST_CHRONO_STATIC_CONSTEXPR bool is_monotonic =            
BOOST_CHRONO_THREAD_CLOCK_IS_MONOTONIC;

However following patch works for me:
#   if defined(_POSIX_THREAD_CPUTIME) && !defined(BOOST_DISABLE_THREADS)
#     define BOOST_CHRONO_HAS_THREAD_CLOCK
#     define BOOST_CHRONO_THREAD_CLOCK_IS_MONOTONIC true
#   endif
#   if defined(CLOCK_THREAD_CPUTIME_ID) && !defined(BOOST_DISABLE_THREADS)
#     define BOOST_CHRONO_HAS_THREAD_CLOCK
#     define BOOST_CHRONO_THREAD_CLOCK_IS_MONOTONIC true
#   endif
I'm not sure about BOOST_DISABLE_THREADS.

Vicente Botet wrote:
> 
> // posix/thread_clock.hpp
> ...
> #if defined CLOCK_THREAD_CPUTIME_ID
>       if ( ::clock_gettime( CLOCK_THREAD_CPUTIME_ID, &ts ) )
> #else
>         // get the current thread
>         pthread_t pth=pthread_self();
>         // get the clock_id associated to the current thread
>         clockid_t clock_id;
>         pthread_getcpuclockid(pth, &clock_id);
>         // get the timespec associated to the thread clock
>         if ( ::clock_gettime( clock_id, &ts ) )
> #endif
> 
On Android works fine for me.

BR,
Libor

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