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By John G. Webster (Editor)

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The disadvantage of the symmetric and asymmetric schemes is the limited modularity of the resulting process definition. Changing the name of the process may necessitate the examination of all other process’ destination. All references to the old process must be found, in order to modify them to the new name. This is not desirable from the point of view of separate compilation. Moreover, the receive primitive in a server should allow receipt of a mes- 437 sage from any client to provide a service to whatever client process calls it.

The client could time out and re-send, and hopefully the receive primitive will be invoked in the meantime. Otherwise, the client can give up. The second approach to deal with this problem is to buffer the message in the operating system area for a specified period of time. If during this period the appropriate receive primitive is invoked the message is copied to the invoking server space. If the receive primitive is not invoked and the timeout expires the message is discarded. Buffered message passing systems are more complex than unbuffered message passing based systems, since they require creation, destruction, and management of the buffers.

The client process expects to receive a majority of responses from the current members of the process group. Total Response. The client process requires all current members of the group to respond to the delivery of a request message. No Ordering. This semantic implies that all request messages will be sent to the current group of processes in no apparent order. FIFO Ordering. This semantic implies that all request messages transmitted in the first-in first-out (FIFO) order by a client process to the current members of the group will be delivered in the FIFO order.

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