1  #include <unistd.h>
       2  
       3  int
       4  fallback_usleep (useconds_t d)
       5  {
       6    /* This function serves as a replacement for usleep in
       7       this test case.  It does not even attempt to be functionally
       8       equivalent  - we just want some sort of delay. */
       9    int i;
      10    int N = d * 2000;
      11    for (i = 0; i < N; i++)
      12      asm volatile ("" : : : "memory");
      13    return 0;
      14  }
      15  
      16  #pragma omp declare variant (fallback_usleep) match(construct={target},device={arch(nvptx)})
      17  #pragma omp declare variant (fallback_usleep) match(construct={target},device={arch(gcn)})
      18  #pragma omp declare variant (usleep) match(user={condition(1)})
      19  int
      20  tgt_usleep (useconds_t d)
      21  {
      22    return 0;
      23  }
      24  
      25  #pragma omp declare target to (fallback_usleep, tgt_usleep)