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#include <signal.h>
#include <ucontext.h>
#include <stdlib.h>
#include <stdio.h>

#define MAX_TASKS 10

enum TaskState {READY, RUNNING, BLOCKED};

struct TaskControlBlock {
    int task_id;
    TaskState state;
    ucontext_t context;
};

struct TaskControlBlock tasks[MAX_TASKS];
int current_task = 0;
int num_tasks = 0;

void scheduler(int signum) {
    // Switch to the next task
    int next_task = (current_task + 1) % num_tasks;
    while (tasks[next_task].state != READY) {
        next_task = (next_task + 1) % num_tasks;
    }
    if (next_task != current_task) {
        tasks[current_task].state = READY;
        tasks[next_task].state = RUNNING;
        current_task = next_task;
        swapcontext(&tasks[current_task].context, &tasks[next_task].context);
    }
}

void initlibrary() {
    // Initialize the signal handler for the timer
    struct sigaction sa;
    sa.sa_handler = scheduler;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
    sigaction(SIGALRM, &sa, NULL);

    // Set up the timer to generate a signal every 10ms
    struct itimerval timer;
    timer.it_interval.tv_sec = 0;
    timer.it_interval.tv_usec = 10000;
    timer.it_value = timer.it_interval;
    setitimer(ITIMER_REAL, &timer, NULL);
}

int create_task(void *(*start_routine)(void *)) {
    if (num_tasks >= MAX_TASKS) {
        return 1; // Error: maximum number of tasks reached
    }

    // Create a context for the task
    ucontext_t context;
    getcontext(&context);
    context.uc_link = NULL;
    context.uc_stack.ss_sp = malloc(SIGSTKSZ);
    context.uc_stack.ss_size = SIGSTKSZ;
    context.uc_stack.ss_flags = 0;
    makecontext(&context, (void (*)()) start_routine, 0);

    // Create a control block for the task
    tasks[num_tasks].task_id = num_tasks;
    tasks[num_tasks].state = READY;
    tasks[num_tasks].context = context;
    num_tasks++;

    return 0;
}

void *task1(void *arg) {
    while (1) {
        printf("+");