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#include <threads.h>
 
struct node_t {
  void * node;
  struct node_t * next;
};
 
struct node_t list;
static mtx_t lock;
static cnd_t condition;
 
void consume_list_element(void) {
  if (thrd_success != mtx_lock(&lock)) {
    /* Handle error */
  }
 
  if (list.next == NULL) {
    if (thrd_success != cnd_wait(&condition, &lock)) {
      /* Handle error */
    }
  }

  /* Proceed when condition holds */

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

#include <threads.h>
 
struct node_t {
  void * node;
  struct node_t * next;
};
 
struct node_t list;
static mtx_t lock;
static cnd_t condition;
 
void consume_list_element(void) {
  if (thrd_success != mtx_lock(&lock)) {
    /* Handle error */
  }
 
  while (list.next == NULL) {
    if (thrd_success != cnd_wait(&condition, &lock)) {
      /* Handle error */
    }
  }

  /* Proceed when condition holds */

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