Rename the hello subdirectory to test

test/hello-tls.c

@@ -0,0 +1,37 @@
+#include <windows.h>
+#include <stdio.h>
+#include <process.h>
+
+#if defined(_MSC_VER)
+static __declspec(thread) int tlsvar = 1;
+#else
+static __thread int tlsvar = 1;
+#endif
+
+static unsigned __stdcall threadfunc(void* arg) {
+    int id = (int)arg;
+    printf("thread %d, tlsvar %p initially %d\n", id, &tlsvar, tlsvar);
+    tlsvar = id + 100;
+    for (int i = 0; i < 4; i++) {
+        printf("thread %d, tlsvar %p %d\n", id, &tlsvar, tlsvar);
+        tlsvar += 10;
+        Sleep(500);
+    }
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    HANDLE threads[3];
+
+    for (int i = 0; i < 3; i++) {
+        printf("mainthread, tlsvar %p %d\n", &tlsvar, tlsvar);
+        tlsvar += 10;
+        threads[i] = (HANDLE)_beginthreadex(NULL, 0, threadfunc, (void*)(intptr_t) (i + 1), 0, NULL);
+        Sleep(350);
+    }
+    for (int i = 0; i < 3; i++) {
+        WaitForSingleObject(threads[i], INFINITE);
+        CloseHandle(threads[i]);
+    }
+    return 0;
+}