Threads in c, what am I missing here? - c

Question

I'm trying to create a thread, and I cannot figure out what I am doing wrong here. It's very basic, I just want to make sure I can get the thread created before I delve into what I'll be doing in the thread. Here's my code.
//prog.c
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <pthread.h>
#include <stdbool.h>
#include <unistd.h>
int threadCount =0; //Global variable to hold our thread counter
//this is the function that gets called when a thread is created
void *threadCreate(void* arg){
printf("Thread #%d has been created\n", threadCount);
threadCount++;
int param = (int)arg;
printf("We were sent: %d\n", param);
printf("Now the thread will die\n");
threadCount--;
pthread_exit(NULL);
}
//main
int main(int argc, char *argv[]){
pthread_t tid;
int numski = 50;
int res;
res = pthread_create(&tid, NULL, threadCreate, (void*)numski);
if (res){
printf("Error: pthread_create returned %d\n", res);
exit(EXIT_FAILURE);
}
return 0;
}
I am compiling using the following command:
gcc -Wall -pthread -std=c99 prog.c -o Prog
And when I try to run it, I get no output at all.

Answer 1

Main is exiting right away, and therefore your process is dying right away. End it with pthread_join to wait for them. Here is one example I googled, which contains the following example code:
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void *print_message_function( void *ptr );
main()
{
pthread_t thread1, thread2;
const char *message1 = "Thread 1";
const char *message2 = "Thread 2";
int iret1, iret2;
/* Create independent threads each of which will execute function */
iret1 = pthread_create( &thread1, NULL, print_message_function, (void*) message1);
iret2 = pthread_create( &thread2, NULL, print_message_function, (void*) message2);
/* Wait till threads are complete before main continues. Unless we */
/* wait we run the risk of executing an exit which will terminate */
/* the process and all threads before the threads have completed. */
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
printf("Thread 1 returns: %d\n",iret1);
printf("Thread 2 returns: %d\n",iret2);
exit(0);
}
void *print_message_function( void *ptr )
{
char *message;
message = (char *) ptr;
printf("%s \n", message);
}