LISA auto/RR-G+RR-G+RR-R
(*
* Result: Never
*
* Process 0 starts (t=100000).
*
* P0 advances one grace period (t=200000).
*
* P1 advances one grace period (t=300001).
*
* P2 goes back a bit less than one grace period (t=201002).
*
* Process 0 start at t=100000, process 3 end at t=201002: Cycle forbidden.
*)
{
}
P0 | P1 | P2 | P3 ;
r[once] r1 x0 | r[once] r1 x1 | f[rcu_read_lock] | w[once] x0 1 ;
f[sync] | f[sync] | r[once] r1 x2 | w[once] x1 1 ;
r[once] r2 x1 | r[once] r2 x2 | r[once] r2 x0 | w[once] x2 1 ;
| | f[rcu_read_unlock] | ;
Observed
2:r2=0; 2:r1=1; 1:r2=1; 1:r1=0; 0:r2=0; 0:r1=0;