message buffer

message buffer

[′mes·ij ‚bəf·ər]
(computer science)
One of a number of sections of computer memory, which contains a message that can be transmitted between tasks in the computer system to request service and receive replies from tasks, and which is stored in a system buffer area, outside the address spaces of tasks.
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mini send(caller, destination, ms): If the destination process is blocked waiting for that message from the caller, the message is copied from the caller's message buffer pointed by msg to the destination's message buffer, otherwise the caller process is blocked.
For a process-based implementation, since the user-allocated message buffer is not accessible to other processes, an intermediate copy from the user-allocated buffer to the shared system buffer is still necessary.
Then, programmers who work with an Ethernet port need only deal with transmit and receive message buffers and an interrupt service routine (ISR).