Let your server program act as a memory manager. The memory manager uses a paging scheme in which pages and frames are of size 128 bytes. Clients request main memory space by sending to the server the total number of bytes in their logical process. Given a list of free frames, the server allocates frames for the clients. After clients' logical space has been mapped to physical space, the server will be prompted with a client number (must be verified) and a logical address. The server will respond by calculating the physical address. If given an invalid logical address, the server will print an appropriate message.
Example: Client requests memory for its program of size 300 bytes. If the free space list (the list of free frames) is 5, 3, 0, 1, 2, then Client1 will be allocated frame 5 (for its first 128 bytes), frame 3 (for its next 128 bytes) and frame 0 (for its final 44 bytes). When prompted for the physical address for logical address 200, the page table for Client1will be examined. We will know that the address in question is on page 1 at offset 72, which is loaded in frame 3. Frame 3 begins at location 384, which is (128 * 3). The server calculates the physical address to be 384 + 72.
The server:
The server program accepts memory requests for each of three clients. A page table is built for each client. The frames assigned to the client are sent back to the client. Pages are mapped to frames according to a free frame list. For the final check on your program, please use the following free frame list: 4, 6, 2, 7, 0, 5, 9, 11, 10, 1, 8, 3. The server will work on a static set of memory allocations as long as the operator wants to continue. The server will print out a representation of the allocated frames (where each frame indicates which client it belongs to, and which page is loaded into it). After the memory allocation has been set, the server will prompt for a client number and a logical address and will return the physical address.
The client:
Each client program sends a memory request to the server program. Each client will print its memory size and its assigned frames.
Memory Management:
You may use a physical memory of 12 frames.
To be displayed:
The server should print the client number, the logical address, the frame number, the physical address and a representation of the physical memory.