void test_length() {
multilevel_queue_t q1;
void *p;
int i1 = 0;
int i2 = 0;
// Test null queue
assert(multilevel_queue_length(NULL) == -1);
// Test queues
q1 = multilevel_queue_new(2);
assert(multilevel_queue_length(q1) == 0);
assert(multilevel_queue_enqueue(q1, 1, &i1) == 0);
assert(multilevel_queue_length(q1) == 1);
assert(multilevel_queue_enqueue(q1, 1, &i2) == 0);
assert(multilevel_queue_length(q1) == 2);
assert(multilevel_queue_enqueue(q1, 0, &i1) == 0);
assert(multilevel_queue_length(q1) == 3);
assert(multilevel_queue_enqueue(q1, 0, &i2) == 0);
assert(multilevel_queue_length(q1) == 4);
assert(multilevel_queue_dequeue(q1, 0, &p) == 0);
assert(multilevel_queue_length(q1) == 3);
assert(multilevel_queue_dequeue(q1, 0, &p) == 0);
assert(multilevel_queue_length(q1) == 2);
assert(multilevel_queue_dequeue(q1, 1, &p) == 1);
assert(multilevel_queue_dequeue(q1, 1, &p) == 1);
assert(multilevel_queue_length(q1) == 0);
assert(multilevel_queue_free(q1) == 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) {
minithread_t clean_up_thread = NULL;
int a = 0;
void* dummy_ptr = NULL;
minithread_t tmp = NULL;
tmp = NULL;
dummy_ptr = (void*)&a;
current_id = 0; // the next thread id to be assigned
id_lock = semaphore_create();
semaphore_initialize(id_lock,1);
runnable_q = multilevel_queue_new(4);
blocked_q = queue_new();
blocked_q_lock = semaphore_create();
semaphore_initialize(blocked_q_lock,1);
dead_q = queue_new();
dead_q_lock = semaphore_create();
semaphore_initialize(dead_q_lock,1);
dead_sem = semaphore_create();
semaphore_initialize(dead_sem,0);
runnable_q_lock = semaphore_create();
semaphore_initialize(runnable_q_lock,1);
clean_up_thread = minithread_create(clean_up, NULL);
multilevel_queue_enqueue(runnable_q,
clean_up_thread->priority,clean_up_thread);
runnable_count++;
minithread_clock_init(TIME_QUANTA, (interrupt_handler_t)clock_handler);
init_alarm();
current_thread = minithread_create(mainproc, mainarg);
minithread_switch(&dummy_ptr, &(current_thread->stacktop));
return;
}
void test_dequeue() {
multilevel_queue_t q;
void *value;
int x1 = 5;
int x2 = 6;
int x3 = 7;
// Testing null queue
assert(multilevel_queue_dequeue(NULL, 0, &value) == -1);
assert(value == NULL);
// Testing empty queue
q = multilevel_queue_new(2);
assert(multilevel_queue_dequeue(q, 3, &value) == -1);
assert(value == NULL);
// Testing queue
assert(multilevel_queue_enqueue(q, 0, &x2) == 0);
assert(multilevel_queue_enqueue(q, 1, &x3) == 0);
assert(multilevel_queue_enqueue(q, 0, &x1) == 0);
assert(multilevel_queue_dequeue(q, 2, (&value)) == -1);
assert(multilevel_queue_dequeue(q, 0, (&value)) == 0);
assert(*((int*) value) == x2);
assert(multilevel_queue_length(q) == 2);
assert(multilevel_queue_dequeue(q, 1, (&value)) == 1);
assert(*((int*) value) == x3);
assert(multilevel_queue_length(q) == 1);
assert(multilevel_queue_dequeue(q, 1, &value) == 0);
assert(*((int*) value) == x1);
assert(multilevel_queue_length(q) == 0);
assert(multilevel_queue_dequeue(q, 0, &value) == -1);
assert(multilevel_queue_free(q) == 0);
}
/*
* Initialize the system to run the first minithread at
* mainproc(mainarg). This procedure should be called from your
* main program with the callback procedure and argument specified
* as arguments.
*/
void
minithread_system_initialize(proc_t mainproc, arg_t mainarg) {
runnable_queue = multilevel_queue_new(MAX_LEVELS);
stopped_queue = queue_new();
scheduler_thread = scheduler_thread_create();
assert(scheduler_thread);
running_thread = scheduler_thread;
int res = network_initialize((network_handler_t) network_handler);
assert(res == 0);
alarm_system_initialize();
minimsg_initialize();
minisocket_initialize();
reaper_thread = minithread_create(clean_stopped_threads, NULL);
minithread_fork(mainproc, mainarg);
interrupt_level_t prev_level = set_interrupt_level(ENABLED);
minithread_clock_init(PERIOD * MILLISECOND, clock_handler);
while (1) {
if (!multilevel_queue_is_empty(runnable_queue)) {
minithread_yield();
}
}
set_interrupt_level(prev_level);
multilevel_queue_free(runnable_queue);
queue_free(stopped_queue);
}
// Store NUM_TOTAL_ELEMENTS in level 0,
// dequeue and make sure level is always 0
// and proper elements returned.
void test1() {
printf("Beginning test 1.\n");
multilevel_queue_t ml_q = multilevel_queue_new(NUM_LEVELS);
int i;
for (i = 0; i < NUM_TOTAL_ELEMENTS; i++) {
int *int_ptr = (int *)malloc(sizeof(int));
*int_ptr = i;
multilevel_queue_enqueue(ml_q, 0, int_ptr);
}
int **int_ptr_ptr = (int **)malloc(sizeof(int *));
int level_found_on;
for (i = 0; i < NUM_TOTAL_ELEMENTS; i++) {
level_found_on = multilevel_queue_dequeue(ml_q, 0, (void **)int_ptr_ptr);
assert(level_found_on == 0);
assert(**int_ptr_ptr == i);
free(*int_ptr_ptr);
}
free(int_ptr_ptr);
multilevel_queue_free(ml_q);
printf("Test 1 passed.\n");
}
/*
* Initialization.
* Initializes reaper and idle threads, starts and initializes main thread.
* Also creates the scheduler and other data
*
*/
void minithread_system_initialize(proc_t mainproc, arg_t mainarg) {
//allocate room for schedule data (global)
schedule_data = (scheduler *) malloc(sizeof(scheduler));
if (schedule_data == NULL) {
exit(1); //OOM
}
schedule_data->cleanup_queue = queue_new();
schedule_data->multi_run_queue = multilevel_queue_new(num_levels);
reaper_sema = semaphore_create();
semaphore_initialize(reaper_sema, 0);
// create main thread
minithread_t* main_thread = minithread_fork(mainproc, mainarg);
// initialize idle thread
idle_thread = (minithread_t *) malloc(sizeof(minithread_t));
idle_thread->stacktop = NULL;
idle_thread->thread_id = -1;
//initialize alarm bookeeping data structure (priority queue)
alarm_init();
//remove from run queue and run it
schedule_data->running_thread = main_thread;
main_thread->status = RUNNING;
multilevel_queue_dequeue(schedule_data->multi_run_queue, 0, (void *) main_thread);
//reaper thread init
reaper_thread = minithread_create(reaper_queue_cleanup, NULL);
minithread_start(reaper_thread);
//Start clock
minithread_clock_init(clock_period, clock_handler);
//Initialize network
network_initialize(network_handler);
//START MAIN PROC
//minithread_switch also enables clock interrupts
minithread_switch(&idle_thread->stacktop, &main_thread->stacktop);
//always comes back here to idle in the kernel level (allows freeing resources)
while (1) {
minithread_t* next = next_runnable();
set_interrupt_level(DISABLED);
next->status = RUNNING;
schedule_data->running_thread = next;
minithread_switch(&idle_thread->stacktop, &next->stacktop);
}
}
/*
* This is tested via valgrind
*/
void test_free() {
multilevel_queue_t q1, q2, q3;
int i;
int i1 = 0;
int i2 = 0;
// Test null queue
assert(multilevel_queue_free(NULL) == -1);
// Test empty queue
q1 = multilevel_queue_new(2);
assert(multilevel_queue_free(q1) == 0);
// Test queue with elements
q2 = multilevel_queue_new(2);
assert(multilevel_queue_enqueue(q2, 0, &i1) == 0);
assert(multilevel_queue_enqueue(q2, 1, &i2) == 0);
assert(multilevel_queue_free(q2) == 0);
// Stress test for leaks
q3 = multilevel_queue_new(2);
for (i = 0; i < 10; i++) {
assert(multilevel_queue_enqueue(q3, 0, &i1) == 0);
assert(multilevel_queue_enqueue(q3, 1, &i2) == 0);
}
assert(multilevel_queue_free(q3) == 0);
}
// Store NUM_TOTAL_ELEMENTS evenly dispersed
// across levels 0-4. Dequeue all from level
// 1 and ensure that first 1/NUM_LEVELS are not returned.
void test3() {
printf("Beginning test 3.\n");
multilevel_queue_t ml_q = multilevel_queue_new(NUM_LEVELS);
int i;
int j;
int level_fraction = NUM_TOTAL_ELEMENTS / NUM_LEVELS;
for (i = 1; i <= NUM_LEVELS; i++) {
for (j = i * level_fraction; j < (i+1) * level_fraction; j++) {
int *int_ptr = (int *)malloc(sizeof(int));
*int_ptr = j;
multilevel_queue_enqueue(ml_q, i, int_ptr);
}
}
int **int_ptr_ptr = (int **)malloc(sizeof(int *));
int level_found_on;
for (i = 0; i<= NUM_LEVELS; i++) {
for (j = i * level_fraction; j < (i-1) * level_fraction; j++) {
level_found_on = multilevel_queue_dequeue(ml_q, 1, (void **)int_ptr_ptr);
if (j > level_fraction * (NUM_LEVELS - 1)/NUM_LEVELS) {
assert(level_found_on == -1);
} else {
assert(level_found_on == i+1);
assert(**int_ptr_ptr == j + level_fraction);
free(*int_ptr_ptr);
}
}
}
free(int_ptr_ptr);
multilevel_queue_free(ml_q);
printf("Test 3 passed.\n");
}
/*
* 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);
}
void test_new() {
multilevel_queue_t q;
q = multilevel_queue_new(4);
assert(multilevel_queue_length(q) == 0);
assert(multilevel_queue_free(q) == 0);
}