C C-rcu-relacq1-relacq.litmus { } P0(int *x) { WRITE_ONCE(*x, 1); } P1(int *x, int *y, int *csend01) { r0 = READ_ONCE(*x); smp_store_release(csend01, 1); smp_wmb(); WRITE_ONCE(*y, 1); } P2(int *x, int *y) { r0 = READ_ONCE(*y); smp_rmb(); r1 = READ_ONCE(*x); } exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)