/* Test atomic_exchange routines for existence and proper execution on 1-byte values with each valid memory model. */ /* { dg-do run } */ /* { dg-options "-std=c11 -pedantic-errors" } */ #include extern void abort (void); _Atomic char v; char count, ret; int main () { v = 0; count = 0; if (atomic_exchange_explicit (&v, count + 1, memory_order_relaxed) != count) abort (); count++; if (atomic_exchange_explicit (&v, count + 1, memory_order_acquire) != count) abort (); count++; if (atomic_exchange_explicit (&v, count + 1, memory_order_release) != count) abort (); count++; if (atomic_exchange_explicit (&v, count + 1, memory_order_acq_rel) != count) abort (); count++; if (atomic_exchange_explicit (&v, count + 1, memory_order_seq_cst) != count) abort (); count++; count++; ret = atomic_exchange (&v, count); if (ret != count - 1 || v != count) abort (); return 0; }