/* simple program illustrating passing an argument to a thread

    gcc simple.c -lpthread
    a.out numWorkers

*/

#include <pthread.h>
#include <stdio.h>
#define SHARED 1
#define MAXWORKERS 100

void *Worker(void *);

/* read command line, initialize, and create threads */
int main(int argc, char *argv[]) {
  int i, numWorkers;
  pthread_attr_t attr;
  pthread_t workerid[MAXWORKERS];

  /* set global thread attributes */
  pthread_attr_init(&attr);
  pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);

  /* read command line */
  numWorkers = atoi(argv[1]);

  /* create the workers, then exit */
  for (i = 0; i < numWorkers; i++)
    pthread_create(&workerid[i], &attr, Worker, (void *) i);
  pthread_exit(NULL);
}

/* Each worker prints its identity then quits */
void *Worker(void *arg) {
  int myid = (int) arg;

  printf("worker %d (pthread id %d) has started\n", myid, pthread_self());

}