check in insane test case...

We don't support such behavior.

diff --git a/test/insanesync.c b/test/insanesync.c
new file mode 100644 (file)
index 0000000..100eb20
--- /dev/null
+++ b/test/insanesync.c
@@ -0,0 +1,69 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <threads.h>
+#include <stdatomic.h>
+
+#include "librace.h"
+#include "model-assert.h"
+
+atomic_int x;
+atomic_int y;
+atomic_llong z;
+atomic_llong z2;
+
+/** 
+               This example illustrates a self-satisfying cycling involving
+               synchronization.  A failed synchronization creates the store that
+               causes the synchronization to fail. 
+               
+               The C++11 memory model nominally allows t1=0, t2=1, t3=5.
+
+               This example is insane, we don't support that behavior.
+*/
+
+
+static void a(void *obj)
+{
+       atomic_store_explicit(&z, (long long) &y, memory_order_relaxed);
+       int t1=atomic_fetch_add_explicit(&y, 1, memory_order_release);
+       atomic_store_explicit(&z, (long long) &x, memory_order_relaxed);
+       int t2=atomic_fetch_add_explicit(&y, 1, memory_order_release);
+       printf("t1=%d, t2=%d\n", t1, t2);
+}
+
+
+static void b(void *obj)
+{
+       int t3=atomic_fetch_add_explicit(&y, 1, memory_order_acquire);
+       void * ptr=(void *)atomic_load_explicit(&z, memory_order_relaxed);
+       atomic_store_explicit(&z2, ptr, memory_order_relaxed);
+       printf("t3=%d\n", t3);
+}
+
+static void c(void *obj)
+{
+       void * ptr2=(void *) atomic_load_explicit(&z2, memory_order_relaxed);
+       atomic_store_explicit((atomic_int *)ptr2, 5, memory_order_relaxed);
+}
+
+int user_main(int argc, char **argv)
+{
+       thrd_t t1, t2, t3;
+
+       
+       atomic_init(&x, 0);
+       atomic_init(&y, 0);
+       atomic_init(&z, (long long) &x);
+       atomic_init(&z2, (long long) &x);
+
+       thrd_create(&t1, (thrd_start_t)&a, NULL);
+       thrd_create(&t2, (thrd_start_t)&b, NULL);
+       thrd_create(&t3, (thrd_start_t)&c, NULL);
+       
+       thrd_join(t1);
+       thrd_join(t2);
+       thrd_join(t3);
+       
+
+       return 0;
+}