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#include <stdio.h>
#include <stdbool.h>
// Test for __atomic_compare_exchange_n
void test_compare_exchange_n() {
int x = 42;
int expected = 42;
int desired = 100;
// Should succeed, since *x == expected
bool success = __atomic_compare_exchange_n(&x, &expected, desired,
false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
printf("=== __atomic_compare_exchange_n ===\n");
printf("success=%d, x=%d, expected=%d\n", success, x, expected);
// Reset for failure case
x = 200;
expected = 42;
desired = 300;
success = __atomic_compare_exchange_n(&x, &expected, desired,
false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
printf("failure case: success=%d, x=%d, expected=%d\n", success, x, expected);
}
// Test for __atomic_compare_exchange
void test_compare_exchange() {
int x = 42;
int expected = 42;
int desired = 100;
// Same semantics but explicit expected as a pointer
bool success = __atomic_compare_exchange(&x, &expected, &desired,
false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
printf("=== __atomic_compare_exchange ===\n");
printf("success=%d, x=%d, expected=%d\n", success, x, expected);
// Reset for failure case
x = 200;
expected = 42;
desired = 300;
success = __atomic_compare_exchange(&x, &expected, &desired,
false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
printf("failure case: success=%d, x=%d, expected=%d\n", success, x, expected);
}
int main() {
test_compare_exchange_n();
test_compare_exchange();
return 0;
}
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