xref: /kernel/linux/linux-5.10/tools/memory-model/litmus-tests/R+poonceonces.litmus
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18c2ecf20Sopenharmony_ciC R+poonceonces
28c2ecf20Sopenharmony_ci
38c2ecf20Sopenharmony_ci(*
48c2ecf20Sopenharmony_ci * Result: Sometimes
58c2ecf20Sopenharmony_ci *
68c2ecf20Sopenharmony_ci * This is the unordered (thus lacking smp_mb()) version of one of the
78c2ecf20Sopenharmony_ci * classic counterintuitive litmus tests that illustrates the effects of
88c2ecf20Sopenharmony_ci * store propagation delays.
98c2ecf20Sopenharmony_ci *)
108c2ecf20Sopenharmony_ci
118c2ecf20Sopenharmony_ci{}
128c2ecf20Sopenharmony_ci
138c2ecf20Sopenharmony_ciP0(int *x, int *y)
148c2ecf20Sopenharmony_ci{
158c2ecf20Sopenharmony_ci	WRITE_ONCE(*x, 1);
168c2ecf20Sopenharmony_ci	WRITE_ONCE(*y, 1);
178c2ecf20Sopenharmony_ci}
188c2ecf20Sopenharmony_ci
198c2ecf20Sopenharmony_ciP1(int *x, int *y)
208c2ecf20Sopenharmony_ci{
218c2ecf20Sopenharmony_ci	int r0;
228c2ecf20Sopenharmony_ci
238c2ecf20Sopenharmony_ci	WRITE_ONCE(*y, 2);
248c2ecf20Sopenharmony_ci	r0 = READ_ONCE(*x);
258c2ecf20Sopenharmony_ci}
268c2ecf20Sopenharmony_ci
278c2ecf20Sopenharmony_ciexists (y=2 /\ 1:r0=0)
28

Indexes created Thu Nov 07 10:32:03 CST 2024