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#include <condition_variable>
#include <mutex>
 
struct Node {
  void *node;
  struct Node *next;
};
  
static Node list;
static std::mutex m;
static std::condition_variable condition;
  
void consume_list_element(std::condition_variable &condition) {
  std::unique_lock<std::mutex> lk(m);
  
  if (list.next == nullptr) {
    condition.wait(lk);
  }
 
  // Proceed when condition holds.
}

#include <condition_variable>
#include <mutex>
 
struct Node {
  void *node;
  struct Node *next;
};
  
static Node list;
static std::mutex m;
static std::condition_variable condition;
  
void consume_list_element() {
  std::unique_lock<std::mutex> lk(m);
  
  while (list.next == nullptr) {
    condition.wait(lk);
  }
 
  // Proceed when condition holds.
}