add subdirectory for tests

[c11tester.git] / pthread_test / uninit.cc

diff --git a/pthread_test/uninit.cc b/pthread_test/uninit.cc
new file mode 100644 (file)
index 0000000..075e2ac
--- /dev/null
+++ b/pthread_test/uninit.cc
@@ -0,0 +1,57 @@
+/**
+ * @file uninit.cc
+ * @brief Uninitialized loads test
+ *
+ * This is a test of the "uninitialized loads" code. While we don't explicitly
+ * initialize y, this example's synchronization pattern should guarantee we
+ * never see it uninitialized.
+ */
+#include <stdio.h>
+#include <pthread.h>
+#include <atomic>
+
+//#include "librace.h"
+
+std::atomic_int x;
+std::atomic_int y;
+
+static void *a(void *obj)
+{
+       int flag = x.load(std::memory_order_acquire);
+       printf("flag: %d\n", flag);
+       if (flag == 2)
+               printf("Load: %d\n", y.load(std::memory_order_relaxed));
+       return NULL;
+}
+
+static void *b(void *obj)
+{
+       printf("fetch_add: %d\n", x.fetch_add(1, std::memory_order_relaxed));
+       return NULL;
+}
+
+static void *c(void *obj)
+{
+       y.store(3, std::memory_order_relaxed);
+       x.store(1, std::memory_order_release);
+       return NULL;
+}
+
+int user_main(int argc, char **argv)
+{
+       pthread_t t1, t2, t3;
+
+       std::atomic_init(&x, 0);
+
+       printf("Main thread: creating 3 threads\n");
+       pthread_create(&t1,NULL, &a, NULL);
+       pthread_create(&t2,NULL, &b, NULL);
+       pthread_create(&t3,NULL, &c, NULL);
+
+       pthread_join(t1,NULL);
+       pthread_join(t2,NULL);
+       pthread_join(t3,NULL);
+       printf("Main thread is finished\n");
+
+       return 0;
+}