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#include <stdatomic.h>
#include <inttypes.h>
#include <stdio.h>
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
_Atomic uint32_t atomic_4;
#endif
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
_Atomic uint16_t atomic_2;
#endif
int
main(void)
{
int ret = 0;
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
uint32_t zero_4 = 0;
if (atomic_compare_exchange_strong(&atomic_4, &zero_4, 1)) {
printf("atomic_compare_exchange 4 worked, value %" PRIu32 " zero %" PRIu32 "\n", atomic_4,
zero_4);
uint32_t old;
old = atomic_exchange_explicit(&atomic_4, 0, memory_order_relaxed);
if (atomic_4 == 0 && old == 1) {
printf("atomic_exchange_explicit 4 worked %" PRIu32 " value now %" PRIu32 "\n", old,
atomic_4);
} else {
printf("atomic_exchange_explicit failed %" PRIu32 " value now %" PRIu32 "\n", old,
atomic_4);
ret = 1;
}
} else {
printf("atomic_compare_exchange 4 failed, value %" PRIu32 "\n", atomic_4);
ret = 1;
}
#endif
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
uint16_t zero_2 = 0;
if (atomic_compare_exchange_strong(&atomic_2, &zero_2, 1)) {
printf("atomic_compare_exchange 2 worked, value %" PRIu16 " zero %" PRIu16 "\n", atomic_2,
zero_2);
uint16_t old;
old = atomic_exchange_explicit(&atomic_2, 0, memory_order_relaxed);
if (atomic_2 == 0 && old == 1) {
printf("atomic_exchange_explicit 2 worked %" PRIu16 " value now %" PRIu16 "\n", old,
atomic_2);
} else {
printf("atomic_exchange_explicit 2 failed %" PRIu16 " value now %" PRIu16 "\n", old,
atomic_2);
ret = 1;
}
} else {
printf("atomic_compare_exchange 2 failed, value %" PRIu16 "\n", atomic_2);
ret = 1;
}
#endif
return ret;
}
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