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#include <threads.h>
#include <stdbool.h>
 
extern bool until_finish(void);
extern mtx_t lock;
extern cnd_t condition;
 
void func(void) {
  if (thrd_success != mtx_lock(&lock)) {
    /* Handle error */
  }

  while (until_finish()) {  /* Predicate does not hold */
    if (thrd_success != cnd_wait(&condition, &lock)) {
      /* Handle error */
    }
  }
 
  /* Resume when condition holds */

  if (thrd_success != mtx_unlock(&lock)) {
    /* Handle error */
  }
}