From: Florian Weimer <fweimer@redhat.com>
Subject: [PATCH] Add a test case for C++11 thread_local support
To: libc-alpha@sourceware.org
2015-10-06 Florian Weimer <fweimer@redhat.com>
* configure.ac (libc_cv_cxx_thread_local): Define.
* configure: Regenerate.
* config.make.in (have-cxx-thread_local): Define.
* nptl/Makefile (CFLAGS-tst-thread_local1.o):
(LDLIBS-tst-thread_local1): Define.
(tests): Add tst-thread_local1.
[have-cxx-thread_local != yes] (tests-unsupported): Add
tst-thread_local1.
* nptl/tst-thread_local1.cc: New file.
@@ -68,6 +68,7 @@ bind-now = @bindnow@
have-hash-style = @libc_cv_hashstyle@
use-default-link = @use_default_link@
output-format = @libc_cv_output_format@
+have-cxx-thread_local = @libc_cv_cxx_thread_local@
static-libgcc = @libc_cv_gcc_static_libgcc@
@@ -1982,6 +1982,31 @@ if test $libc_cv_builtin_trap = yes; then
AC_DEFINE([HAVE_BUILTIN_TRAP])
fi
+dnl C++ feature tests.
+AC_LANG_PUSH([C++])
+
+AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
+ libc_cv_cxx_thread_local, [
+old_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -std=gnu++11"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+struct S
+{
+ S ();
+ ~S ();
+};
+thread_local S s;
+S * get () { return &s; }
+])],
+ [libc_cv_cxx_thread_local=yes],
+ [libc_cv_cxx_thread_local=no])
+CXXFLAGS="$old_CXXFLAGS"
+])
+AC_SUBST(libc_cv_cxx_thread_local)
+
+AC_LANG_POP([C++])
+dnl End of C++ feature tests.
+
### End of automated tests.
### Now run sysdeps configure fragments.
@@ -212,6 +212,8 @@ CFLAGS-recvfrom.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-pt-system.c = -fexceptions
LDLIBS-tst-once5 = -lstdc++
+CFLAGS-tst-thread_local1.o = -std=gnu++11
+LDLIBS-tst-thread_local1 = -lstdc++
tests = tst-typesizes \
tst-attr1 tst-attr2 tst-attr3 tst-default-attr \
@@ -283,7 +285,8 @@ tests = tst-typesizes \
tst-getpid3 \
tst-setuid3 \
tst-initializers1 $(addprefix tst-initializers1-,c89 gnu89 c99 gnu99) \
- tst-bad-schedattr
+ tst-bad-schedattr \
+ tst-thread_local1
xtests = tst-setuid1 tst-setuid1-static tst-setuid2 \
tst-mutexpp1 tst-mutexpp6 tst-mutexpp10
test-srcs = tst-oddstacklimit
@@ -403,6 +406,10 @@ ifeq (,$(CXX))
# These tests require a C++ compiler and runtime.
tests-unsupported += tst-cancel24 tst-cancel24-static tst-once5
endif
+# These tests require a C++ compiler with thread_local support.
+ifneq ($(have-cxx-thread_local),yes)
+tests-unsupported += tst-thread_local1
+endif
include ../Rules
new file mode 100644
@@ -0,0 +1,200 @@
+/* Test basic thread_local support.
+ Copyright (C) 2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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"
--
2.4.3