Re: [Boost-users] Support for sp_counted_base for HPItaniumaCCcompiler

Baruch Zilber wrote:

You are right. I fixed it and here is the new implementation:

inline void atomic_increment( int * pw ) { _Asm_fetchadd(_FASZ_W, _SEM_ACQ, (void*)pw, +1, _LDHINT_NONE); }

inline int atomic_decrement( int * pw ) { int r = static_cast<int>(_Asm_fetchadd(_FASZ_W, _SEM_ACQ, (void*)pw, -1, _LDHINT_NONE)); if (1 == r) { _Asm_mf(); }

return r - 1; }

Hmm. Why did you switch to _SEM_ACQ? atomic_increment should use _REL because it's rumored to be cheaper, and atomic_decrement needs to use _REL for correctness.