C++ (Cpp) __atomic_is_lock_free Beispiele

Beispiel #1

Datei: atomic-noinline.c Projekt: AlexMioMio/gcc

int
main ()
{

  ac = __atomic_exchange_n (&bc, cc, __ATOMIC_RELAXED);
  if (bc != 1)
    abort ();

  as = __atomic_load_n (&bs, __ATOMIC_SEQ_CST);
  if (bs != 1)
    abort ();

  __atomic_store_n (&ac, bc, __ATOMIC_RELAXED);
  if (ac != 1)
    abort ();

  __atomic_compare_exchange_n (&as, &bs, cs, 0, __ATOMIC_SEQ_CST, __ATOMIC_ACQUIRE);
  if (as != 1)
    abort ();

  ac = __atomic_fetch_add (&cc, 15, __ATOMIC_SEQ_CST);
  if (cc != 1)
    abort ();

  /* This should be translated to __atomic_fetch_add for the library */
  as = __atomic_add_fetch (&cs, 10, __ATOMIC_RELAXED);

  if (cs != 1)
    abort ();

  /* The fake external function should return 10.  */
  if (__atomic_is_lock_free (4, 0) != 10)
    abort ();
   
  /* PR 51040 was caused by arithmetic code not patching up nand_fetch properly
     when used an an external function.  Look for proper return value here.  */
  ac = 0x3C;
  bc = __atomic_nand_fetch (&ac, 0x0f, __ATOMIC_RELAXED);
  if (bc != ac)
    abort ();

  return 0;
}

Beispiel #2

Datei: threads_pthread.c Projekt: PeterMosmans/openssl

int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
{
# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
    if (__atomic_is_lock_free(sizeof(*val), val)) {
        *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
        return 1;
    }
# endif
    if (!CRYPTO_THREAD_write_lock(lock))
        return 0;

    *val += amount;
    *ret  = *val;

    if (!CRYPTO_THREAD_unlock(lock))
        return 0;

    return 1;
}

Beispiel #3

Datei: atomic-ops.c Projekt: Chxnew/minix

#ifdef __i386__
_Static_assert(__GCC_ATOMIC_LLONG_LOCK_FREE == 1, "");
#else
_Static_assert(__GCC_ATOMIC_LLONG_LOCK_FREE == 2, "");
#endif
_Static_assert(__GCC_ATOMIC_POINTER_LOCK_FREE == 2, "");

_Static_assert(__c11_atomic_is_lock_free(1), "");
_Static_assert(__c11_atomic_is_lock_free(2), "");
_Static_assert(__c11_atomic_is_lock_free(3), ""); // expected-error {{not an integral constant expression}}
_Static_assert(__c11_atomic_is_lock_free(4), "");
_Static_assert(__c11_atomic_is_lock_free(8), "");
_Static_assert(__c11_atomic_is_lock_free(16), ""); // expected-error {{not an integral constant expression}}
_Static_assert(__c11_atomic_is_lock_free(17), ""); // expected-error {{not an integral constant expression}}

_Static_assert(__atomic_is_lock_free(1, 0), "");
_Static_assert(__atomic_is_lock_free(2, 0), "");
_Static_assert(__atomic_is_lock_free(3, 0), ""); // expected-error {{not an integral constant expression}}
_Static_assert(__atomic_is_lock_free(4, 0), "");
_Static_assert(__atomic_is_lock_free(8, 0), "");
_Static_assert(__atomic_is_lock_free(16, 0), ""); // expected-error {{not an integral constant expression}}
_Static_assert(__atomic_is_lock_free(17, 0), ""); // expected-error {{not an integral constant expression}}

char i8;
short i16;
int i32;
int __attribute__((vector_size(8))) i64;
struct Incomplete *incomplete;

_Static_assert(__atomic_is_lock_free(1, &i8), "");
_Static_assert(__atomic_is_lock_free(1, &i64), "");