/*
* @@name:	mem_model.2c
* @@type:	C
* @@compilable:	yes
* @@linkable:	yes
* @@expect:	rt-error
*/
#include <omp.h>
#include <stdio.h>
int main()
{
    int data;
    int flag=0;
    #pragma omp parallel num_threads(2)
     {
       if (omp_get_thread_num()==0)
        {
            /* Write to the data buffer that will be
            read by thread */
            data = 42;
            /* Flush data to thread 1 and strictly order
            the write to data
            relative to the write to the flag */
            #pragma omp flush(flag, data)
            /* Set flag to release thread 1 */
            flag = 1;
            /* Flush flag to ensure that thread 1 sees
            the change */
            #pragma omp flush(flag)
        }
       else if(omp_get_thread_num()==1)
        {
            /* Loop until we see the update to the flag */
            #pragma omp flush(flag, data)
            while (flag < 1)
              {
                #pragma omp flush(flag, data)
              }
            /* Values of flag and data are undefined */
            printf("flag=%d data=%d\n", flag, data);
            #pragma omp flush(flag, data)
            /* Values data will be 42, value of flag
            still undefined */
            printf("flag=%d data=%d\n", flag, data);
        }
    }
    return 0;
}