Re: [Boost-build] __sync_val_compare_and_swap_4

Subject: Re: [Boost-build] __sync_val_compare_and_swap_4
From: Madhukar Sandi (Madhukar.Sandi_at_[hidden])
Date: 2010-07-23 03:22:49

Hi All,

Thanks for your support.

We found the solution here. Whether it is all the test cases correct or not please verify?

We replaced this returned statement ( __sync_val_compare_and_swap_4 ) and included assembly language code in atomic.hpp.

(volatile boost::uint32_t *mem, boost::uint32_t with, boost::uint32_t cmp)
{ /* return __sync_val_compare_and_swap(const_cast<boost::uint32_t *>(mem), cmp, with);*/
   boost::uint32_t result;
  asm volatile(".set\tpush\n\t"
                       ".set\tnoreorder\n\t"
                       ".set\tnomacro\n\t"
                       "1:\n\t"
                        "ll\t%[result],0(%[mem])\n\t"
                       "bne\t%[result],%[with],2f\n\t"
                        "move\t%[result],$0\n\t"        // delay slot
                        "move\t%[result],%[mem]\n\t"
                        "sc\t%[result],0(%[mem])\n\t"
                        "beq\t%[result],$0,1b\n\t"
                        "nop\n\t"                       // delay slot
                        "2:\n\t"
                        ".set\tpop"
           : [result] "=&r" (result)
           : [mem] "r" (mem), [cmp] "r" (cmp), [with] "r"(with)
           : "memory");

return result;
 }

Any body Please verify?

Thanks
Madhukar Sandi

-----Original Message-----
From: boost-build-bounces_at_[hidden] [mailto:boost-build-bounces_at_[hidden]] On Behalf Of Oliver Kowalke
Sent: Thursday, July 22, 2010 8:09 PM
To: Boost.Build developer's and user's list
Subject: Re: [Boost-build] __sync_val_compare_and_swap_4

I got the same error on ARM. It seams that the version I used (gcc 4.3. I beleive) did not implement the atomic ops. Upgrade to gcc 4.4.4 helped me for ARM. Maybe you too.

Oliver

-------- Original-Nachricht --------
> Datum: Wed, 21 Jul 2010 13:38:07 +0530
> Von: Madhukar Sandi <Madhukar.Sandi_at_[hidden]>
> An: "Boost.Build developer\'s and user\'s list" <boost-build_at_[hidden]>
> Betreff: [Boost-build] __sync_val_compare_and_swap_4

> Hi
>
> When im doing cross compiling boost libraries on Cronus mips board.
>
> I am getting below error
>
> undefined reference to `__sync_val_compare_and_swap_4'
>
> Please any one have solution , pls share with me
>
>
> user_at_user-desktop:~/madhukar/boost/boost_1_43_0/workspace/interprocess/messageque$
> mips-linux-g++ -lpthread -lrt -g  -march=mips32
> comp_doc_message_queueA.cpp -o mess -I/home/user/madhukar/boost/boost_1_43_0/
> ../../../stage/lib/libboost_thread.a
>
> I got below error....
>
> /tmp/ccVKlA7S.o:/home/user/madhukar/boost/boost_1_43_0/boost/interprocess/detail/atomic.hpp:306:
> undefined reference to `__sync_val_compare_and_swap_4'
> collect2: ld returned 1 exit status
>
> Thanks & Regards
> Madhukar Sandi
>
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