Banker algorithm

/** @file assg03-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 Resource Allocation Denial (Banker's * Algorithm) deadlock avoidance Simulator, used to perform system * tests. */ #include "State.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 state.sim" << endl << "Run Resource Allocation Denial (Banker's Algorithm) on simulation" << endl << "state file. Return safe if the state is safe, or unsafe if not." << endl << endl << endl << "state.sim Filename describing system state to load and" << endl << " test if it is safe or unsafe." << 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 != 2) { usage(); } string stateFileName = string(argv[1]); // create a State, load the file, and test if the state is safe // or unsafe State state; state.loadState(stateFileName); try { cout << state << endl; if (state.isSafe()) { cout << "State is safe" << endl; } else { cout << "State is unsafe" << endl; } } catch (const SimulatorException& e) { cerr << "Simulation run resulted in runtime rror occurring:" << endl; cerr << e.what() << endl; exit(1); } // exit with 0 status code to indicate successful invocation of simulator return 0; }