Add simple thread example

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/tests/util/CMakeLists.txt

@@ -25,3 +25,6 @@ add_test(options ${CMAKE_CURRENT_BINARY_DIR}/options)
 add_executable(scoped_map scoped_map.cpp)
 target_link_libraries(scoped_map ${EXTRA_LIBS})
 add_test(scoped_map ${CMAKE_CURRENT_BINARY_DIR}/scoped_map)
+add_executable(thread thread.cpp)
+target_link_libraries(thread ${EXTRA_LIBS})
+add_test(thread ${CMAKE_CURRENT_BINARY_DIR}/thread)

src/tests/util/thread.cpp

@@ -0,0 +1,30 @@
+/*
+Copyright (c) 2013 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+
+Author: Leonardo de Moura
+*/
+#include <thread>
+#include <iostream>
+#include <mutex>
+#include <vector>
+
+static void foo() {
+    static thread_local std::vector<int> v(1024);
+    if (v.size() != 1024) {
+        std::cerr << "Error\n";
+        exit(1);
+    }
+}
+
+static void tst1() {
+    unsigned n = 5;
+    for (unsigned i = 0; i < n; i++) {
+        std::thread t([](){ foo(); });
+        t.join();
+    }
+}
+
+int main() {
+    tst1();
+}