Re: [boost] shared_ptr under OS X

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2005-08-21 15:56:57

On Aug 21, 2005, at 4:28 PM, Steve Ramsey wrote:

> I've had a number of programs crash after recompiling with the 1.33.0
> release and eventually tracked the problems down to shared_ptr,
> specifically the atomic_decrement function provided in
> sp_counted_base_cw_ppc.hpp.

Try these:

inline void atomic_increment( register long * pw )
{
     register int a;
     asm
     {
loop:

     lwarx   a, 0, pw
     addi    a, a, 1
     stwcx.  a, 0, pw
     bne-    loop
     }
}

inline long atomic_decrement( register long * pw )
{
     register int a;
     asm
     {
     sync

loop:

     lwarx   a, 0, pw
     addi    a, a, -1
     stwcx.  a, 0, pw
     bne-    loop

     isync
     }
     return a;
}

inline long atomic_conditional_increment( register long * pw )
{
     register int a;
     asm
     {
loop:

     lwarx   a, 0, pw
     cmpwi   a, 0
     beq     store

     addi    a, a, 1

store:

     stwcx.  a, 0, pw
     bne-    loop

     }
     return a;
}

-Howard