Viewing file:  atomic-lockfree.c (2.64 KB) -rw-r--r--
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/* Test __atomic routines for existence and execution with each valid
memory model. */
/* { dg-options "-w" } */
/* { dg-do run } */
/* { dg-additional-sources "atomic-lockfree-aux.c" } */
/* Test that __atomic_{is,always}_lock_free builtins execute.
sync-mem-lockfree-aux.c supplies and external entry point for
__atomic_is_lock_free which always returns a 2. We can detect the
external routine was called if 2 is returned since that is not a valid
result normally. */
#include <stdlib.h>
extern void abort();
int r1, r2;
/* Test for consistency on sizes 1, 2, 4, 8, 16 and 32. */
int
main ()
{
r1 = __atomic_always_lock_free (sizeof(char), 0);
r2 = __atomic_is_lock_free (sizeof(char), 0);
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
r1 = __atomic_always_lock_free (2, 0);
r2 = __atomic_is_lock_free (2, 0);
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
r1 = __atomic_always_lock_free (4, 0);
r2 = __atomic_is_lock_free (4, 0); /* Try passing in a variable. */
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
r1 = __atomic_always_lock_free (8, 0);
r2 = __atomic_is_lock_free (8, 0);
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
r1 = __atomic_always_lock_free (16, 0);
r2 = __atomic_is_lock_free (16, 0);
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
r1 = __atomic_always_lock_free (32, 0);
r2 = __atomic_is_lock_free (32, 0);
/* If always lock free, then is_lock_free must also be true. */
if (r1)
{
if (r2 != 1)
abort ();
}
else
{
/* If it is not lock free, then the external routine must be called. */
if (r2 != 2)
abort ();
}
return 0;
}
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