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time-stamping
It is a method proposed by Lamport, used to sequencing events in a distributed machine without the use of clocks. This process is intended to order events consisting of the transmission of codes. Each machine 'i' in the network used to maintain a counter Ci. Each time a system transmits a code; it adds its counter by 1 and selected the time-stamp Ti to the code. When a message is get, the receiving system 'j' puts its counter Cj to 1 more than the largest of its current number and the incoming timestamp Ti. At every site, the ordering of codes is calculated by the following principle: For messages x from site y and i from site j, x goes beyond y if one of the following conditions true....(a) if Ti
Parent and Child process communicate in unix A child and parent can interact through any of the normal inter-process communication schemes (pipes, message queues, sockets, s
Q. Is disk scheduling except FCFS scheduling useful in a single-user environment? describe your answer. Answer: In a single-user environment the I/O queue typically is empty.
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Direct communication With direct communication each process that requires to communicate must explicitly name the recipient or sender of the communication. The send and receive
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