LISA auto/RW-G+RW-Rs+RW-RD+RW-R+RW-R
(*
* Result: Sometimes
*
* Process 0 starts (t=197994).
*
* P0 advances one grace period (t=297994).
*
* P1 advances slightly (t=297996).
*
* P2 advances slightly (t=297998).
*
* P3 goes back a bit less than one grace period (t=198999).
*
* P4 goes back a bit less than one grace period (t=100000).
*
* Process 0 start at t=197994, process 5 end at t=100000: Cycle allowed.
*)
{
1:r3=x3; x2=y3; 2:r4=y3;
}
P0 | P1 | P2 | P3 | P4 ;
r[once] r1 x0 | f[rcu_read_lock] | f[rcu_read_lock] | f[rcu_read_lock] | f[rcu_read_lock] ;
f[sync] | r[once] r1 x1 | r[deref] r1 x2 | r[once] r1 x3 | r[once] r1 x4 ;
w[once] x1 1 | w[assign] x2 r3 | w[once] r1 1 | w[once] x4 1 | w[once] x0 1 ;
| f[rcu_read_unlock] | f[rcu_read_unlock] | f[rcu_read_unlock] | f[rcu_read_unlock] ;
Observed
4:r1=1; 3:r1=1; 2:r1=x3; 1:r1=1; 0:r1=1;
and 4:r1=0; 3:r1=1; 2:r1=x3; 1:r1=1; 0:r1=1;
and 4:r1=1; 3:r1=0; 2:r1=x3; 1:r1=1; 0:r1=1;
and 4:r1=0; 3:r1=0; 2:r1=x3; 1:r1=1; 0:r1=1;
and 4:r1=1; 3:r1=1; 2:r1=x3; 1:r1=1; 0:r1=0;
and 4:r1=0; 3:r1=1; 2:r1=x3; 1:r1=1; 0:r1=0;
and 4:r1=1; 3:r1=0; 2:r1=x3; 1:r1=1; 0:r1=0;
and 4:r1=0; 3:r1=0; 2:r1=x3; 1:r1=1; 0:r1=0;