LISA auto/RR-GR1+RR-R
(*
* Result: Never
*
* Process 0 starts (t=100000).
*
* P0 advances one grace period (t=200000).
*
* P1 goes back a bit less than one grace period (t=101001).
*
* Process 0 start at t=100000, process 2 end at t=101001: Cycle forbidden.
*)
{
}
P0 | P1 | P2 ;
f[rcu_read_lock] | f[rcu_read_lock] | w[once] x0 1 ;
r[once] r1 x0 | r[once] r1 x1 | w[once] x1 1 ;
f[rcu_read_unlock] | r[once] r2 x0 | ;
f[sync] | f[rcu_read_unlock] | ;
r[once] r2 x1 | | ;
Observed
1:r2=1; 1:r1=1; 0:r2=0; 0:r1=1;
and 1:r2=1; 1:r1=0; 0:r2=0; 0:r1=1;