Waiting for multiple semaphores without animation (C / C ++ Linux)

Question

If I have more than one semaphore, how can I create a process block until at least one of the semaphores is free? I know I can do this with a wait loop, for example:

// blocks until one of the semaphores in sems is free, returns
// index of semaphore that was available
int multiple_sem_wait(sem_t **sems, int num_sems) {
   while (true) {
      for (int i = 0; i < num_sems; ++i) {
         if (sem_trywait(sems[i]) == 0) {
            return i;
         }
      }
   }
}

But is there a way to do this without employment? Perhaps there is some kind of IPC method other than semaphores that I should use?

thank

Answer 1

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Answer 2

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