Re: Threading in new C++ standard

"Dmitriy V'jukov" <>
Fri, 2 May 2008 23:57:48 -0700 (PDT)
On 3 =D0=BC=D0=B0=D0=B9, 00:06, "Chris Thomasson" <> wrot=

"Dmitriy V'jukov" <> wrote in message
On 2 =C3=8D=C3=81=C3=8A, 01:08, "Chris Thomasson" <> wr=


So you can't implement VZOOM object lifetime management in
autodetection mode, you need compiler_acquire_barrier and

No way could I do highly platform dependant auto-detection with C++0x.=

can get it to work with signals, but that's a little crazy:

I am saying not about auto-detection logic itself, but about
vz_acquire()/vz_release() functions. I think they look something like
void vz_acquire(void* p)
  per_thread_rc_array[hash(p)] += 1;
  compiler_acquire_barrier(); // <--------------
void vz_release(void* p)
  compiler_release_barrier(); // <--------------
  per_thread_rc_array[hash(p)] -= 1;
The question: will you have to manually implement and port to every
compiler compiler_acquire_barrier()/compiler_release_barrier()?

The implementation of the function which mutates the array is externally

and I document that link-time optimization level should be turned down, or=

off... Oh well.

Link-time optimization can increase performance by 10-20%. And it's on
by default in release build of MSVC...

Btw, Joe Seigh in atomic-ptr uses following:
#define fence() __asm__ __volatile__ ("" : : : "memory")
#define smrnull(hptr) \
    do { \
        fence(); \
        atomic_store(&hptr[0], 0); \
        atomic_store(&hptr[1], 0); \
    } while (0)
What do you think?

Dmitriy V'jukov

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