Viewing file:  atomic-compare-exchange-2.c (2.05 KB) -rw-r--r--
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/* Test __atomic routines for existence and proper execution on 2 byte
values with each valid memory model. */
/* { dg-do run } */
/* Test the execution of the __atomic_compare_exchange_n builtin for a short. */
extern void abort(void);
short v = 0;
short expected = 0;
short max = ~0;
short desired = ~0;
short zero = 0;
#define STRONG 0
#define WEAK 1
int
main ()
{
if (!__atomic_compare_exchange_n (&v, &expected, max, STRONG , __ATOMIC_RELAXED, __ATOMIC_RELAXED))
abort ();
if (expected != 0)
abort ();
if (__atomic_compare_exchange_n (&v, &expected, 0, STRONG , __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
abort ();
if (expected != max)
abort ();
if (!__atomic_compare_exchange_n (&v, &expected, 0, STRONG , __ATOMIC_RELEASE, __ATOMIC_ACQUIRE))
abort ();
if (expected != max)
abort ();
if (v != 0)
abort ();
if (__atomic_compare_exchange_n (&v, &expected, desired, WEAK, __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE))
abort ();
if (expected != 0)
abort ();
if (!__atomic_compare_exchange_n (&v, &expected, desired, STRONG , __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
abort ();
if (expected != 0)
abort ();
if (v != max)
abort ();
/* Now test the generic version. */
v = 0;
if (!__atomic_compare_exchange (&v, &expected, &max, STRONG, __ATOMIC_RELAXED, __ATOMIC_RELAXED))
abort ();
if (expected != 0)
abort ();
if (__atomic_compare_exchange (&v, &expected, &zero, STRONG , __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
abort ();
if (expected != max)
abort ();
if (!__atomic_compare_exchange (&v, &expected, &zero, STRONG , __ATOMIC_RELEASE, __ATOMIC_ACQUIRE))
abort ();
if (expected != max)
abort ();
if (v != 0)
abort ();
if (__atomic_compare_exchange (&v, &expected, &desired, WEAK, __ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE))
abort ();
if (expected != 0)
abort ();
if (!__atomic_compare_exchange (&v, &expected, &desired, STRONG , __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
abort ();
if (expected != 0)
abort ();
if (v != max)
abort ();
return 0;
}
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