Importance

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Abstract

A computer system has a message handler for passing messages between processes. The message handler makes use of a message queue and a process queue. The message queue holds a list of messages between the processes, arranged in chronological order according to the length of time each message has been waiting for delivery. The process queue holds a list of processes that have requested messages, arranged in chronological order according to the length of time each process has been waiting for a message. The message handler searches the queues to find the earliest process in the process queue that currently has a message queued for it, and to find the earliest message in the message queue currently queued for that process, and then passes that message to that process. The message handler may be implemented as a TSR (Terminate and Stay Resident) process, running under a single-thread operating system.

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First Claim