Stack overflow pthread arguments passing example

thread_args_test.c

/*
 ============================================================================
 Name        : thread_test.c
 Author      : Tennessee Carmel-Veilleux
 Version     :
 Copyright   : Public domain
 Description : Simple args-passing example with pthreads
 ============================================================================
 */

// FIXME: THIS IS FOR A STACK OVERFLOW ANSWER: NOT ALL ERRORS CHECKED FOR MORE SUCCINT CODE

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>

// You can have all you want in here to fully configure your thread. Try
// to have everything be immutable (not rely in things that change under
// your feet in other threads).
typedef struct {
    unsigned long long large_serial_number;
    const char *my_name;
    pthread_t caller_thread;
} fun_thread_args_t;

#define NUM_LOOPS 5u
static void* _fun_thread_run(void *arg) {
    // Get our thread args from the dynamically allocated thread args passed-in
    fun_thread_args_t *thread_args = (fun_thread_args_t *)arg;

    unsigned int counter = 0;
    bool done = false;

    while (!done) {
        // Use args here in your thread loop
        counter++;
        printf("My name is: '%s', my number is: %llX, loop count: %u\n",
               thread_args->my_name,
               thread_args->large_serial_number,
               counter);

        if (counter >= NUM_LOOPS) {
            printf("'%s' is sooooo done.\n", thread_args->my_name);
            done = true;
        } else {
            sleep(1u);
        }
    }

    // Free incoming args pointer before exiting the thread loop.
    free(arg);
    return NULL;
}

static pthread_t *_launch_fun_thread(pthread_t *thread, unsigned long long serial_number, const char *name) {
    // TODO: Of course, error-handle all the return values properly ;)

    // Allocate and prepare args for the thread
    fun_thread_args_t *args = calloc(1, sizeof(args));

    args->caller_thread = pthread_self();
    args->large_serial_number = serial_number;
    args->my_name = name;

    int rc = pthread_create(thread, NULL, &_fun_thread_run, args);
    if (0 == rc) {
        return thread;
    } else {
        free(args);
        return NULL;
    }
}

int main(void) {
	puts("The fun we are having!");

	pthread_t fun_thread1;
	pthread_t fun_thread2;

	_launch_fun_thread(&fun_thread1, 0xABCDEF12345678ULL, "super FUN thread 1");
	usleep(500UL * 1000UL);
	_launch_fun_thread(&fun_thread2, 0xDEADBEEF55AA55ULL, "super FUN thread 2");

	pthread_join(fun_thread1, NULL);
	pthread_join(fun_thread2, NULL);

	puts("We are done having fun :(");
	return EXIT_SUCCESS;
}