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2803ICT System and Distributed Computing
Task:
Objectives:
The objective of this assignment is to write a multithreaded client server system for multiprocessing. This requires putting into practice what has been taught about Multithreading, IPC, and synchronisation.
Requirements:
1. The program will consist of a multi-threaded server and single- or multi-threaded client process.
2. The client will query the user for 32-bit integers to be processed and will pass each request to the server to process and will immediately request the user for more input numbers or q to quit.
3. The server will start up either the number of specified threads if given (see Req.15) or as many threads as there are binary digits times the max number of queries (i.e. 320 threads). The server will take each input number (unsigned long) and create 32 numbers to be factorised from it.Each thread will be responsible for factorising an integer derived from the input number that is rotated right by a different number of bits.
Given an input number K, each thread #X will factorise K rotated right by increasing number of bits. For example, thread #0 will factorise the number K rotated right by 0 bits, thread #1 will factorise K rotated right by 1 bit, thread # 2 will factorise K rotated right by 2 bits etc.
Tip: Rotating an integer K by B bits = ( K >> B) | (K
4. The trial division method should be used for integer factorisation.
5. The server must handle up to 10 simultaneous requests without blocking.
6. The client is non-blocking. Up to 10 server responses may be outstanding at any time, if the user makes a request while 10 are outstanding, the client will warn the user that the system is busy.
7. The client will immediately report any responses from the server and in the case of the completion of a response to a query, the time taken for the server to respond to that query.
8. The client and server will communicate using shared memory. The client will write data for the server to a shared 32-bit variable called ‘number’. The server will write data for the client to a shared array of 32-bit variables called a ‘slot’ that is 10 elements long. Each element in the
array (slot) will correspond to an individual client query so only a maximum of 10 queries can be outstanding at any time. This means that any subsequent queries will be blocked until one of the 10 outstanding queries completes, at which times its slot can be reused by the server for its
response to the new query.
9. Since the client and server use shared memory to communicate a handshaking protocol is required to ensure that the data gets properly transferred. The server and client need to know when data is available to be read and data waiting to be read must not be overwritten by new data until it has been read.
For this purpose, some shared variables are needed for signalling the state of data.
2803ICT System and Distributed Computing
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