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#include <stdatomic.h>
 
/* Sets index to point to index of maximum element in array
   and value to contain maximum array value. */
void find_max_element(atomic_int array[], size_t index, int value);

void func(void) {
  atomic_int array[];
  size_t index;
  int value;
  find_max_element(array, &index, &value);
  /* ... */
  if (!atomic_compare_exchange_weakstrong(array[index], value, 0)) {
    /* Handle error */
  }
}

#include <stdatomic.h>
#include <threads.h>
 
void func(void) {
  atomic_int array[];
  size_t index;
  int value;
  mtx_t array_mutex;
  if (thrd_success != mtx_lock(&array_mutex)) {
    /* Handle error */
  }
  find_max_element(array, &index, &value);
  /* ... */
  if (!atomic_compare_exchange_weakstrong(array[index], value, 0)) {
    /* Handle error */
  }
  if (thrd_success != mtx_unlock(&array_mutex)) {
    /* Handle error */
  }
}