From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; 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. --- libstdc++-v3/testsuite/18_support/pthread_guard.cc | 65 ++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 libstdc++-v3/testsuite/18_support/pthread_guard.cc (limited to 'libstdc++-v3/testsuite/18_support/pthread_guard.cc') 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 +// . + +// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* } } +// { dg-options "-pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-darwin* alpha*-*-osf* } } + +#include +#include + +// 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; +} -- cgit v1.2.3