/*
* @@name:	mem_model.3
* @@type:	C
* @@operation:	run
* @@expect:	unspecified
* @@version:	omp_3.1
*/
#include <omp.h>
#include <stdio.h>

int data0 = 0, data1 = 0;

int main()
{
   int flag=0;

   #pragma omp parallel num_threads(3)
   {
      if(omp_get_thread_num()==0)
      {
         data0 = 17;
         #pragma omp flush
         /* Set flag to release thread 1 */
         #pragma omp atomic update
         flag++;
         /* Flush of flag is implied by the atomic directive */
      }
      else if(omp_get_thread_num()==1)
      {
         int flag_val = 0;
         /* Loop until we see that flag reaches 1*/
         while(flag_val < 1)
         {
            #pragma omp atomic read
            flag_val = flag;
         }
         #pragma omp flush
         /* data0 is 17 here */
         printf("Thread 1 awoken (data0 = %d)\n", data0);
         data1 = 42;
         #pragma omp flush(data1)
         /* Set flag to release thread 2 */
         #pragma omp atomic update
         flag++;
         /* Flush of flag is implied by the atomic directive */
      }
      else if(omp_get_thread_num()==2)
      {
         int flag_val = 0;
         /* Loop until we see that flag reaches 2 */
         while(flag_val < 2)
         {
            #pragma omp atomic read
            flag_val = flag;
         }
         #pragma omp flush(data0,data1)
         /* there is a data race here;
            data0 is 17 and data1 is undefined */
         printf("Thread 2 awoken (data0 = %d, data1 = %d)\n",
               data0, data1);
      }
   }
   return 0;
}