thread.c

#include <stdio.h>
#include <assert.h>
#include <pthread.h>

long int counter = 0;

void* run (void* args) {
	int my_id;
	long int j;

	my_id = (int) args;

	for (j=0;j<1000000; j++) {
		counter = counter + 1;
	}

	printf("my_id=%d j=%ld counter=%ld\n", my_id, j, counter);
	pthread_exit(my_id);
}


int main (int argc, char *argv[]) {
	int i;
	pthread_t pthreads[3];

	for (i=0; i<3;i++) {
		pthread_create (&pthreads[i], NULL, &run, (void*) i);
	}

	for (i=0; i<3; i++) {
		pthread_join(pthreads[i], NULL);
	}

	printf("counter=%ld\n", counter);
}