thread.cpp

#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#include "thread.h"

static int g_tid = 0;

static int fib(int n){
    switch (n) {
        case 0: return 1;
        case 1: return 1;
        default: return (fib(n-2) + fib(n-1));
    }
}

void * thread_proc(void* ctx)
{
    int tid = g_tid++;

    char thread_name[16];
    snprintf(thread_name, sizeof(thread_name), "Thread %d", tid);  // ✅ replaced sprintf with snprintf

#ifdef __APPLE__
    pthread_setname_np(thread_name);
#else
    pthread_setname_np(pthread_self(), thread_name);
#endif

    // Random delay, 0 - 0.5 sec
    timespec ts;
    ts.tv_sec = 0;
    ts.tv_nsec = 500000000 + ((float)rand() / (float)RAND_MAX) * 500000000;
    nanosleep(&ts, NULL);

    volatile int i = 0;
    while (i <= 30) {
        std::cout << "Thread " << tid << ": fib(" << i << ") = " << fib(i) << std::endl;
        i++;
        nanosleep(&ts, NULL);
    }

    std::cout << thread_name << " exited!" << std::endl;

    return nullptr;  // ✅ fixed missing return
}