/* * Initialization. * * minithread_system_initialize: * This procedure should be called from your C main procedure * to turn a single threaded UNIX process into a multithreaded * program. * * Initialize any private data structures. * Create the idle thread. * Fork the thread which should call mainproc(mainarg) * Start scheduling. * */ int minithread_system_initialize(proc_t mainproc, arg_t mainarg) { dbgprintf("Initializing minithread system...\n"); ready_queue = multilevel_queue_new(2, 0); stop_queue = queue_new(); dead_queue = queue_new(); if (!ready_queue || !stop_queue || !dead_queue ) { return 0; } last_id = 0; current_quanta_end = 0; current = idle = minithread_create(NULL, NULL); minithread_fork(mainproc, mainarg); // initialize alarm subsystem alarm_system_initialize(); minithread_clock_init(minithread_clock_handler); // interrupts currently disabled // schedule will call switch, which will enable interrupts minithread_schedule(); // begin idle thread body minithread_idle(); // system is shutting down now // stop clock interrupts // minithread_clock_stop(); // cleanup alarm system alarm_system_cleanup(); // cleanup thread system minithread_system_cleanup(); return 0; }
/* * Initialization. * * minithread_system_initialize: * This procedure should be called from your C main procedure * to turn a single threaded UNIX process into a multithreaded * program. * * Initialize any private data structures. * Create the idle thread. * Fork the thread which should call mainproc(mainarg) * Start scheduling. * */ void minithread_system_initialize(proc_t mainproc, arg_t mainarg) { // create an initial TCB minithread_t tcb = (minithread_t) malloc(sizeof(minithread)); // Create a dummy pointer that points nowhere for the idle thread's stack stack_pointer_t* stack_top = (stack_pointer_t*) malloc(sizeof(stack_pointer_t)); // Create the ready queue ready_queue = multilevel_queue_new(4); // There are currently 0 ready threads ready_threads = 0; // Set the current level we inspect in the ML queue to 0 current_level = 0; // The first level of the queue has quanta of 1 period ticks_until_switch = 1; // The number of ticks to spend in the first ML queue level ticks_until_next_level = 80; // Create the waiting queue cleanup_queue = queue_new(); // Create the alarm queue alarm_queue = queue_new(); // Create the cleanup semaphore cleanup_sem = semaphore_create(); semaphore_initialize(cleanup_sem, 0); // Initialize the TCB tcb->id = 0; tcb->priority = 0; tcb->proc = (proc_t) minithread_idle; tcb->arg = NULL; tcb->dir_block_id = 0; // it'll never be used anyway // remember to update the initialize stack call a few lines down too - // the first 2 nulls should also be proc/arg // Allocate the stack tcb->stack_base = NULL; // don't need this // just give it a dummy pointer so it can context switch tcb->stack_top = stack_top; // Set the global variables idle = tcb; running = idle; // Setup interrupts minithread_clock_init(&interrupt_handler); // Setup disk interrupts install_disk_handler((interrupt_handler_t) &disk_interrupt_handler); // Initialize the keyboard miniterm_initialize(); // Initialize the minimsg layer minimsg_initialize(); // Initialize the minisocket layer minisocket_initialize(); // Initialize the miniroute layer miniroute_initialize(); // Before interrupts are enabled, start the network handler network_initialize((interrupt_handler_t) &network_handler); // Initialize the filesystem minifile_initialize(); // Fork the mainproc(mainarg) thread minithread_fork(mainproc, mainarg); // Fork a cleanup thread cleanup = minithread_fork((proc_t) minithread_cleanup, NULL); // Enable the interrupts set_interrupt_level(ENABLED); // Start the idle procedure minithread_idle(NULL); }