How can I wait for any/all pthreads to complete?

Question

I just want my main thread to wait for any and all my (p)threads to complete before exiting.

The threads come and go a lot for different reasons, and I really don\'

Answer 1

you could keep a list all your thread ids and then do pthread_join on each one, of course you will need a mutex to control access to the thread id list. you will also need some kind of list that can be modified while being iterated on, maybe a std::set?

int main() {
   pthread_mutex_lock(&mutex);

   void *data;
   for(threadId in threadIdList) {
      pthread_mutex_unlock(&mutex);
      pthread_join(threadId, &data);
      pthread_mutex_lock(&mutex);
   }

   printf("All threads completed.\n");
}

// called by any thread to create another
void CreateThread()
{
   pthread_t id;

   pthread_mutex_lock(&mutex);
   pthread_create(&id, NULL, ThreadInit, &id); // pass the id so the thread can use it with to remove itself
   threadIdList.add(id);
   pthread_mutex_unlock(&mutex);  
}

// called by each thread before it dies
void RemoveThread(pthread_t& id)
{
   pthread_mutex_lock(&mutex);
   threadIdList.remove(id);
   pthread_mutex_unlock(&mutex);
}