id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
13265,boost atomic lib memory_order error,haisql@…,timblechmann,"boost atomic lib memory_order error.

someone deleted memory_order_release/memory_order_acquire code,
which should be translate to sfence/lfence ,
but now you see that they were removed.

BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
{
    if (order == memory_order_seq_cst)
    {
        __asm__ __volatile__
        (
#if defined(__x86_64__) || defined(__SSE2__)
            ""mfence\n""
#else
            ""lock; addl $0, (%%esp)\n""
#endif
            ::: ""memory""
        );
    }
    else if ((order & (memory_order_acquire | memory_order_release)) != 0)
    {
        __asm__ __volatile__ ("""" ::: ""memory"");
    }
}

I suggest code is:

BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
{
    if (order == memory_order_seq_cst)
    {
        __asm__ __volatile__
        (
#if defined(__x86_64__) || defined(__SSE2__)
            ""mfence\n""
#else
            ""lock; addl $0, (%%esp)\n""
#endif
            ::: ""memory""
        );
    return;
    }

 if ((order & (memory_order_acquire )!=0 ){
        __asm__ __volatile__
        (
#if defined(__x86_64__) || defined(__SSE2__)
            ""lfence\n""
#else
            ""lock; addl $0, (%%esp)\n""
#endif
            ::: ""memory""
   );
  return; 
  } 
 if ((order & (memory_order_release )!=0 ){
        __asm__ __volatile__
        (
#if defined(__x86_64__) || defined(__SSE2__)
            ""sfence\n""
#else
            ""lock; addl $0, (%%esp)\n""
#endif
            ::: ""memory""
   );
  } 
}


Linux system do not delete lfence and sfence code, but why C++ lib deleted, this will cause error in multi_thread programe.
 ",Bugs,new,To Be Determined,atomic,Boost 1.63.0,Showstopper,,,