By Sheridan J. Coakes
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Extra resources for Analysis Without Anguish: Version 12.0 For Windows (v. 12)
Because the two processes must wait for each other, synchronous message passing is sometimes called rendezvous (or simple rendezvous). 5. 3: Message traffic in asynchronous producer/consumer buffer implementation communication is required for flow-control. The condition synchronization is implemented by the enabling of communication on the channels. When the buffer is empty, then communication on the channel insCh is enabled, but not on the channel remCh. Conversely, when the buffer is full, the situation is reversed.
1 gives the basic structure of the system. The interesting part is the finite buffer used to connect the producer and consumer processes. 4 Shared-memory languages 17 type ’a buffer val buffer : unit -> ’a buffer val insert : (’a * ’a buffer) -> unit val remove : ’a buffer -> ’a The buffer is the shared state in the system, and access to its internal representation must be controlled, which requires mutual exclusion synchronization. There is additional condition synchronization required to keep the producer from inserting items into a full buffer, and to keep the consumer from attempting to remove items from an empty buffer.
Often there is no suitable computation for a thread to do while waiting for the acknowledgement, and when there are multiple threads in a program, parallelism can be gained by running other threads. To use asynchronous message passing correctly without acknowledgements usually requires some a priori knowledge of the system’s behavior. The main disadvantages of asynchronous message passing are rooted in the fact that it provides very little synchronization. Thus, the programmer is forced to implement more complicated protocols to achieve the necessary synchronization.