8.windows message Mechanism (iii) Message Queuing

1. Message Queuing

Message Queuing is used to hold a queue of messages that are first-in-first-out in the queue. All Windows programs have Message Queuing, and the program can get messages from the queue.

2. Types of Message queues

System Message Queuing-a message queue maintained by the system that stores messages generated by the system, such as a mouse, keyboard, and so on.

Program Message Queuing-a message queue that belongs to each application (thread) that is maintained by the application (thread).

3. Relationship of Message Queuing

When a message is generated by the mouse and keyboard, the message is stored in the system message queue.

The system will find the message queue for the corresponding window according to the stored message.

8.windows message Mechanism (iii) Message Queuing