obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 65 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/18_support/pthread_guard.cc b/libstdc++-v3/testsuite/18_support/pthread_guard.cc
new file mode 100644
index 000000000..5389316ba
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/pthread_guard.cc
@@ -0,0 +1,65 @@
+//
+// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* } }
+// { dg-options "-pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-darwin* alpha*-*-osf* } }
+
+#include <cstdlib>
+#include <pthread.h>
+
+// This used to deadlock with the old libstdc++ because there is only one
+// global mutex guarding initialization of statics and it is held during by
+// the initializer thread of a static until the variable is completely
+// initialized. If the initializer thread creates and waits for another thread
+// which also initializes a static variable, there will be a deadlock because
+// the first thread is holding the mutex and waiting for the second thread,
+// which is blocked when it is acquiring the mutex.
+
+int
+get_bar (void)
+{
+  return 1;
+}
+
+void*
+do_something (void *arg)
+{
+  static int bar __attribute__((unused)) = get_bar ();
+  return 0;
+}
+
+int
+get_foo (void)
+{
+  pthread_t new_thread;
+
+  if (pthread_create (&new_thread, 0, do_something, 0) != 0)
+    std::abort ();
+
+  if (pthread_join (new_thread, 0) != 0)
+    std::abort ();
+
+  return 1;
+}
+
+int
+main (int argc, char **argv)
+{
+  static int foo __attribute__((unused)) = get_foo ();
+  return 0;  
+}