/*
 * Exemplo de uso de Pthreads em C
 * Compile com:
 *   gcc -pthread main.c -o prog
 * Ou, em IDEs online, marque “Run with pthread support”.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
 
#define NUM_THREADS 5
 
// Função que cada thread irá executar
void* rotina(void* arg) {
    int id = *(int*)arg;
    printf("Olá do thread %d!\n", id);
    // Simula trabalho
    for (int i = 0; i < 3; i++) {
        printf("Thread %d em execução, passo %d\n", id, i + 1);
    }
    pthread_exit(NULL);
}
 
int main() {
    pthread_t threads[NUM_THREADS];
    int thread_ids[NUM_THREADS];
    int rc;
 
    // Cria as threads
    for (int i = 0; i < NUM_THREADS; i++) {
        thread_ids[i] = i;
        rc = pthread_create(&threads[i], NULL, rotina, &thread_ids[i]);
        if (rc) {
            fprintf(stderr, "Erro ao criar a thread %d, código %d\n", i, rc);
            exit(EXIT_FAILURE);
        }
    }
 
    // Aguarda término de todas as threads
    for (int i = 0; i < NUM_THREADS; i++) {
        pthread_join(threads[i], NULL);
    }
 
    printf("Todas as threads finalizaram. Programa encerrado.\n");
    return 0;
}
 

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