Demo for http://stackoverflow.com/q/19128948/827263

demo.c

/*
 * Test program based on code in the Wikipedia POSIX Threads
 * article, https://en.wikipedia.org/wiki/POSIX_Threads.
 *
 * Demo for http://stackoverflow.com/q/19128948/827263
 */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
 
#define NUM_THREADS     5

long getTimeMilliSecs()
{
    struct timeval tempTime;
    gettimeofday(&tempTime, NULL);
    long retVal = 1000000*tempTime.tv_sec + tempTime.tv_usec;
    return retVal;
}

void *TaskCode(void *argument)
{
   int tid;
 
   tid = *((int *) argument);
   printf("thread %d, getTimeMilliSecs() = %ld\n", tid, getTimeMilliSecs());
 
   /* optionally: insert more useful stuff here */
 
   return NULL;
}
 
int main(void)
{
   pthread_t threads[NUM_THREADS];
   int thread_args[NUM_THREADS];
   int rc, i;
 
   printf("main, getTimeMilliSecs() = %ld\n", getTimeMilliSecs());
   /* create all threads */
   for (i=0; i<NUM_THREADS; ++i) {
      thread_args[i] = i;
      printf("In main: creating thread %d\n", i);
      rc = pthread_create(&threads[i], NULL, TaskCode, (void *) &thread_args[i]);
      assert(0 == rc);
   }
 
   /* wait for all threads to complete */
   for (i=0; i<NUM_THREADS; ++i) {
      rc = pthread_join(threads[i], NULL);
      assert(0 == rc);
   }
 
   exit(EXIT_SUCCESS);
}

output.txt

main, getTimeMilliSecs() = 1380687691732016
In main: creating thread 0
In main: creating thread 1
In main: creating thread 2
thread 0, getTimeMilliSecs() = 1380687691732198
In main: creating thread 3
thread 1, getTimeMilliSecs() = 1380687691732206
thread 2, getTimeMilliSecs() = 1380687691732290
In main: creating thread 4
thread 3, getTimeMilliSecs() = 1380687691732306
thread 4, getTimeMilliSecs() = 1380687691732331