From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- .../Z6.0+pooncelock+pooncelock+pombonce.litmus | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus (limited to 'tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus') diff --git a/tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus b/tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus new file mode 100644 index 000000000..10a2aa04c --- /dev/null +++ b/tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus @@ -0,0 +1,40 @@ +C Z6.0+pooncelock+pooncelock+pombonce + +(* + * Result: Sometimes + * + * This example demonstrates that a pair of accesses made by different + * processes each while holding a given lock will not necessarily be + * seen as ordered by a third process not holding that lock. + *) + +{} + +P0(int *x, int *y, spinlock_t *mylock) +{ + spin_lock(mylock); + WRITE_ONCE(*x, 1); + WRITE_ONCE(*y, 1); + spin_unlock(mylock); +} + +P1(int *y, int *z, spinlock_t *mylock) +{ + int r0; + + spin_lock(mylock); + r0 = READ_ONCE(*y); + WRITE_ONCE(*z, 1); + spin_unlock(mylock); +} + +P2(int *x, int *z) +{ + int r1; + + WRITE_ONCE(*z, 2); + smp_mb(); + r1 = READ_ONCE(*x); +} + +exists (1:r0=1 /\ z=2 /\ 2:r1=0) -- cgit v1.2.3