openmp/runtime/test/api/omp_alloc_null_fb.c

   1 // RUN: %libomp-compile-and-run
   2
   3 #include <stdio.h>
   4 #include <omp.h>
   5
   6 int main() {
   7   omp_alloctrait_t at[2];
   8   omp_allocator_handle_t a;
   9   void *p[2];
  10   at[0].key = omp_atk_pool_size;
  11   at[0].value = 2 * 1024 * 1024;
  12   at[1].key = omp_atk_fallback;
  13   at[1].value = omp_atv_null_fb;
  14   a = omp_init_allocator(omp_default_mem_space, 2, at);
  15   printf("allocator created: %p\n", (void *)a);
  16 #pragma omp parallel num_threads(2)
  17   {
  18     int i = omp_get_thread_num();
  19     #pragma omp barrier
  20     p[i] = omp_alloc(1024 * 1024, a);
  21     #pragma omp barrier
  22     printf("th %d, ptr %p\n", i, p[i]);
  23     omp_free(p[i], a);
  24   }
  25   // As an allocator has some small memory overhead
  26   // exactly one of the two pointers should be NULL
  27   // because of NULL fallback requested
  28   if ((p[0] == NULL && p[1] != NULL) || (p[0] != NULL && p[1] == NULL)) {
  29     printf("passed\n");
  30     return 0;
  31   } else {
  32     printf("failed: pointers %p %p\n", p[0], p[1]);
  33     return 1;
  34   }
  35 }