Viewing file:  stdatomic-compare-exchange-3.c (1.84 KB) -rw-r--r--
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/* Test atomic_compare_exchange routines for existence and proper
execution on 2-byte values with each valid memory model. */
/* { dg-do run } */
/* { dg-options "-std=c11 -pedantic-errors" } */
#include <stdatomic.h>
extern void abort (void);
_Atomic int v = ATOMIC_VAR_INIT (0);
int expected = 0;
int max = ~0;
int desired = ~0;
int zero = 0;
int
main ()
{
if (!atomic_compare_exchange_strong_explicit (&v, &expected, max, memory_order_relaxed, memory_order_relaxed))
abort ();
if (expected != 0)
abort ();
if (atomic_compare_exchange_strong_explicit (&v, &expected, 0, memory_order_acquire, memory_order_relaxed))
abort ();
if (expected != max)
abort ();
if (!atomic_compare_exchange_strong_explicit (&v, &expected, 0, memory_order_release, memory_order_acquire))
abort ();
if (expected != max)
abort ();
if (v != 0)
abort ();
if (atomic_compare_exchange_weak_explicit (&v, &expected, desired, memory_order_acq_rel, memory_order_acquire))
abort ();
if (expected != 0)
abort ();
if (!atomic_compare_exchange_strong_explicit (&v, &expected, desired, memory_order_seq_cst, memory_order_seq_cst))
abort ();
if (expected != 0)
abort ();
if (v != max)
abort ();
v = 0;
if (!atomic_compare_exchange_strong (&v, &expected, max))
abort ();
if (expected != 0)
abort ();
if (atomic_compare_exchange_strong (&v, &expected, zero))
abort ();
if (expected != max)
abort ();
if (!atomic_compare_exchange_strong (&v, &expected, zero))
abort ();
if (expected != max)
abort ();
if (v != 0)
abort ();
if (atomic_compare_exchange_weak (&v, &expected, desired))
abort ();
if (expected != 0)
abort ();
if (!atomic_compare_exchange_strong (&v, &expected, desired))
abort ();
if (expected != 0)
abort ();
if (v != max)
abort ();
return 0;
}
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