Add a test case for C++11 thread_local support

This requires a C++ compiler with thread_local support, and a new
configure check is needed.

1 files changed, 199 insertions, 0 deletions

diff --git a/nptl/tst-thread_local1.cc b/nptl/tst-thread_local1.cc
new file mode 100644
index 0000000000..133cc27ca8
--- /dev/null
+++ b/nptl/tst-thread_local1.cc
@@ -0,0 +1,199 @@
+/* Test basic thread_local support.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <functional>
+#include <string>
+#include <thread>
+
+struct counter
+{
+  int constructed {};
+  int destructed {};
+
+  void reset ();
+};
+
+void
+counter::reset ()
+{
+  constructed = 0;
+  destructed = 0;
+}
+
+static std::string
+to_string (const counter &c)
+{
+  char buf[128];
+  snprintf (buf, sizeof (buf), "%d/%d",
+            c.constructed, c.destructed);
+  return buf;
+}
+
+template <counter *Counter>
+struct counting
+{
+  counting () __attribute__ ((noinline, noclone));
+  ~counting () __attribute__ ((noinline, noclone));
+  void operation () __attribute__ ((noinline, noclone));
+};
+
+template<counter *Counter>
+__attribute__ ((noinline, noclone))
+counting<Counter>::counting ()
+{
+  ++Counter->constructed;
+}
+
+template<counter *Counter>
+__attribute__ ((noinline, noclone))
+counting<Counter>::~counting ()
+{
+  ++Counter->destructed;
+}
+
+template<counter *Counter>
+void __attribute__ ((noinline, noclone))
+counting<Counter>::operation ()
+{
+  // Optimization barrier.
+  asm ("");
+}
+
+static counter counter_static;
+static counter counter_anonymous_namespace;
+static counter counter_extern;
+static counter counter_function_local;
+static bool errors (false);
+
+static std::string
+all_counters ()
+{
+  return to_string (counter_static)
+    + ' ' + to_string (counter_anonymous_namespace)
+    + ' ' + to_string (counter_extern)
+    + ' ' + to_string (counter_function_local);
+}
+
+static void
+check_counters (const char *name, const char *expected)
+{
+  std::string actual{all_counters ()};
+  if (actual != expected)
+    {
+      printf ("error: %s: (%s) != (%s)\n",
+              name, actual.c_str (), expected);
+      errors = true;
+    }
+}
+
+static void
+reset_all ()
+{
+  counter_static.reset ();
+  counter_anonymous_namespace.reset ();
+  counter_extern.reset ();
+  counter_function_local.reset ();
+}
+
+static thread_local counting<&counter_static> counting_static;
+namespace {
+  thread_local counting<&counter_anonymous_namespace>
+    counting_anonymous_namespace;
+}
+extern thread_local counting<&counter_extern> counting_extern;
+thread_local counting<&counter_extern> counting_extern;
+
+static void *
+thread_without_access (void *)
+{
+  return nullptr;
+}
+
+static void *
+thread_with_access (void *)
+{
+  thread_local counting<&counter_function_local> counting_function_local;
+  counting_function_local.operation ();
+  check_counters ("early in thread_with_access", "0/0 0/0 0/0 1/0");
+  counting_static.operation ();
+  counting_anonymous_namespace.operation ();
+  counting_extern.operation ();
+  check_counters ("in thread_with_access", "1/0 1/0 1/0 1/0");
+  return nullptr;
+}
+
+static int
+do_test (void)
+{
+  std::function<void (void *(void *))> do_pthread =
+    [](void *(func) (void *))
+    {
+      pthread_t thr;
+      int ret = pthread_create (&thr, nullptr, func, nullptr);
+      if (ret != 0)
+        {
+          errno = ret;
+          printf ("error: pthread_create: %m\n");
+          errors = true;
+          return;
+        }
+      ret = pthread_join (thr, nullptr);
+      if (ret != 0)
+        {
+          errno = ret;
+          printf ("error: pthread_join: %m\n");
+          errors = true;
+          return;
+        }
+    };
+  std::function<void (void *(void *))> do_std_thread =
+    [](void *(func) (void *))
+    {
+      std::thread thr{[func] {func (nullptr);}};
+      thr.join ();
+    };
+
+  std::array<std::pair<const char *, std::function<void (void *(void *))>>, 2>
+    do_thread_X
+      {{
+        {"pthread_create", do_pthread},
+        {"std::thread", do_std_thread},
+      }};
+
+  for (auto do_thread : do_thread_X)
+    {
+      printf ("info: testing %s\n", do_thread.first);
+      check_counters ("initial", "0/0 0/0 0/0 0/0");
+      do_thread.second (thread_without_access);
+      check_counters ("after thread_without_access", "0/0 0/0 0/0 0/0");
+      reset_all ();
+      do_thread.second (thread_with_access);
+      check_counters ("after thread_with_access", "1/1 1/1 1/1 1/1");
+      reset_all ();
+    }
+
+  return errors;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"