LXR linux/tools/memory-model/litmus-tests/ISA2+poonceonces.litmus

   1C ISA2+poonceonces
   2
   3(*
   4 * Result: Sometimes
   5 *
   6 * Given a release-acquire chain ordering the first process's store
   7 * against the last process's load, is ordering preserved if all of the
   8 * smp_store_release() invocations are replaced by WRITE_ONCE() and all
   9 * of the smp_load_acquire() invocations are replaced by READ_ONCE()?
  10 *)
  11
  12{}
  13
  14P0(int *x, int *y)
  15{
  16        WRITE_ONCE(*x, 1);
  17        WRITE_ONCE(*y, 1);
  18}
  19
  20P1(int *y, int *z)
  21{
  22        int r0;
  23
  24        r0 = READ_ONCE(*y);
  25        WRITE_ONCE(*z, 1);
  26}
  27
  28P2(int *x, int *z)
  29{
  30        int r0;
  31        int r1;
  32
  33        r0 = READ_ONCE(*z);
  34        r1 = READ_ONCE(*x);
  35}
  36
  37exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
  38