Test auto/RW-G+RW-r+RW-a+RW-B

LISA auto/RW-G+RW-r+RW-a+RW-B
(*
 * Result: Never
 * 
 * Process 0 starts (t=100000).
 * 
 * P0 advances one grace period (t=200000).
 * 
 * P1 advances slightly (t=200002).
 * 
 * P2 advances slightly (t=200004).
 * 
 * P3 advances slightly (t=200006).
 * 
 * Process 0 start at t=100000, process 4 end at t=200006: Cycle forbidden.
 *)
{
}
 P0            | P1              | P2               | P3            ;
 r[once] r1 x0 | r[once] r1 x1   | r[acquire] r1 x2 | r[once] r1 x3 ;
 f[sync]       | w[release] x2 1 | w[once] x3 1     | f[mb]         ;
 w[once] x1 1  |                 |                  | w[once] x0 1  ;
Observed
    3:r1=0; 2:r1=1; 1:r1=1; 0:r1=1;