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/** @file assg04-sim.cpp * @brief System Test Simulator * * @author Derek Harter * @note cwid: 123456 * @date Fall 2019 * @note ide: g++ 8.2.0 / GNU Make 4.2.1 * * Command line invocation of Clock Algorithm page replace scheme * Simulator, used to perform system tests. */ #include "PagingSystem.hpp" #include "SimulatorException.hpp" #include <iostream> #include <string> using namespace std; /** * @brief usage * * Usage information for invoking simulator with command line * arguments. Print usage information and exit with non success * status to indicate error. */ void usage() { cout << "Usage: sim scheme memorySize pageref.sim" << endl << " Run page replacement simulation on the given page reference" << endl << " stream file. Output shows the state of memory (loaded pages" << endl << " in each memory frame) after each page reference as well as" << endl << " summary information about hit/miss performance. You can" << endl << " select from different page replacement schemes by specifying" << endl << " the scheme parameter." << endl << "Options:" << endl << " scheme The page replacement scheme to use, current 'fifo'" << endl << " and 'clock' are supported" << endl << " memorySize The number of physical frames of memory to simulate" << endl << " pageref.sim Filename with page references, one per line," << endl << " that represent references to pages of a running" << endl << " (simulated) process or set of processes" << endl; exit(1); } /** * @brief main entry point * * Entry point of the Resource Allocation Denial (Banker's algorithm) * simulator system test command line program. This program is so * small we do most all of our work here. We parse command line * arguments, and if successful we instantiate a ProcessSimulator, * load the indicated simulation events file, and run the simulation. * * @param argc The command line argument count. This program requires * 3 command line arguments to run. * @param argv[] The command line argument values. argv[1] should be * the system timeSliceQuantum, and argv[2] should be the simulation * file to be loaded and executed. * * @return 0 is returned if simulation finishes successfully with no errors * or exceptions. A non-zero value is returned when an exception occurs * or whenever simulation terminates abnormally. */ int main(int argc, char** argv) { // parse command line arguments // if we do not get required command line arguments, print usage // and exit immediately. if (argc != 4) { usage(); } string scheme = string(argv[1]); int memorySize = atoi(argv[2]); string pageRefFileName = string(argv[3]); bool verbose = true; PageReplacementSchemeType schemeType; // determine requested paging scheme type from command line argument if (scheme == "fifo") { schemeType = FIFO; } else if (scheme == "clock") { schemeType = CLOCK; } else { cerr << "Error: unknown paging scheme, use one of 'fifo, clock'" << endl; usage(); } // create simulation of request memory size and using the requested page replacement scheme PagingSystem sim(memorySize, schemeType); // try and run the simulation, use verbose output so we can see whole system simulation // on standard output try { sim.loadPageStream(pageRefFileName); sim.runSimulation(verbose); } catch (const SimulatorException& e) { cerr << "Simulation run resulted in runtime error occurring: " << endl; cerr << e.what() << endl; exit(1); } // exit with 0 status code to indicate successful invocation of simulator return 0; }