Is std::queue having event mechanism( Signals in std::queue)

Question

Is there any event mechanism or predefined signals in the queue. If any data or message comes in the queue the queue should generate an event saying data is ready to process. Or signal other thread to do his task Instead of continuously polling to the queue.

In posix Message Queue there is function like mq_notify() which will notify to other process or thread if any data comes in the Message queue so we can avoid Polling.

Edit

If not, So how can I achieve this on std::queue. I want to avoid polling continuously it is slowing down the performance of the code.

Whenever some event occur on the queue it should notify to others.

Answer 1

std::queue is a containter type, not an event mechanism. I recommend making a class around the queue that implements a message queue.

EDIT: Ok, so

So I recommend using an std::queue, std::mutex, and a std::condition_variable, if you use boost that has the same types. Putting those in your new Queue class and when pushing, you would lock the mutex, push onto the queue, unlock the mutex, and notify_one() the condition. That way the condition variable is notified only when pushed. You can do the same on pop.