提升库版本1.53
Debian Linux 6.0（x86_64上的Linux 2.6.32-5-amd64）
当valgrind日志包含大量警告时，很难测试自己的软件 因此，在没有任何更改的情况下，我构建了HTTP server3示例并在Valgrind下运行它 请看一下。我错过了什么吗？
valgrind --tool = helgrind --log-file = valgrind.log ./server3 0.0.0.0 83 5 / root / server3
这是Helgrind日志（编辑为30000个正文字符限制，完整日志http://pastebin.com/Vkbr9vsA）：
Helgrind, a thread error detector
Copyright (C) 2007-2012, and GNU GPL'd, by OpenWorks LLP et al.
Using Valgrind-3.9.0.SVN and LibVEX; rerun with -h for copyright info
Command: ./server3 0.0.0.0 83 5 /root/server3
Parent PID: 8662
Lock at 0x524F5E0 was first observed
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x5043388: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
by 0x5CE5A7C: clone (clone.S:112)
Possible data race during read of size 8 at 0x524F4E8 by thread #3
Locks held: none
at 0x5043356: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
by 0x5CE5A7C: clone (clone.S:112)
This conflicts with a previous write of size 8 by thread #2
Locks held: 1, at address 0x524F5E0
at 0x5043416: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
by 0x5CE5A7C: clone (clone.S:112)
----------------------------------------------------------------
Possible data race during read of size 4 at 0x524F60C by thread #3
Locks held: none
at 0x50496D4: boost::detail::get_once_per_thread_epoch() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043361: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
by 0x5CE5A7C: clone (clone.S:112)
This conflicts with a previous write of size 4 by thread #2
Locks held: none
at 0x525C27B: pthread_key_create (pthread_key_create.c:44)
by 0x525C82F: pthread_once (pthread_once.S:104)
by 0x50496D3: boost::detail::get_once_per_thread_epoch() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043361: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
----------------------------------------------------------------
Possible data race during read of size 8 at 0x524F4E8 by thread #1
Locks held: 1, at address 0x61A1E20
at 0x5043356: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043478: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5047875: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5044002: boost::thread::join_noexcept() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x42660E: boost::thread::join() (thread.hpp:751)
by 0x4215C5: http::server3::server::run() (server.cpp:63)
by 0x41A65B: main (main.cpp:37)
----------------------------------------------------------------
Possible data race during read of size 4 at 0x524F60C by thread #1
Locks held: 1, at address 0x61A1E20
at 0x50496D4: boost::detail::get_once_per_thread_epoch() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043361: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043478: boost::detail::get_current_thread_data() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5047875: boost::detail::interruption_checker::interruption_checker(pthread_mutex_t*, pthread_cond_t*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5044002: boost::thread::join_noexcept() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x42660E: boost::thread::join() (thread.hpp:751)
by 0x4215C5: http::server3::server::run() (server.cpp:63)
by 0x41A65B: main (main.cpp:37)
This conflicts with a previous write of size 4 by thread #2
Locks held: none
at 0x525C27B: pthread_key_create (pthread_key_create.c:44)
by 0x525C82F: pthread_once (pthread_once.S:104)
by 0x50496D3: boost::detail::get_once_per_thread_epoch() (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043361: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x5043498: boost::detail::set_current_thread_data(boost::detail::thread_data_base*) (in /usr/lib/libboost_thread.so.1.53.0)
by 0x504380E: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
----------------------------------------------------------------
Possible data race during write of size 4 at 0x61A36B8 by thread #6
Locks held: none
at 0x4223B0: boost::asio::detail::epoll_reactor::descriptor_state::set_ready_events(unsigned int) (epoll_reactor.hpp:68)
by 0x4228A5: boost::asio::detail::epoll_reactor::run(bool, boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>&) (epoll_reactor.ipp:430)
by 0x423629: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:396)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
by 0x42EB34: boost::_mfi::mf0<unsigned long, boost::asio::io_service>::operator()(boost::asio::io_service*) const (mem_fn_template.hpp:49)
by 0x42EA72: unsigned long boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> >::operator()<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list0>(boost::_bi::type<unsigned long>, boost::_mfi::mf0<unsigned long, boost::asio::io_service>&, boost::_bi::list0&, long) (bind.hpp:243)
by 0x42E91E: boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >::operator()() (bind_template.hpp:20)
by 0x42E65D: boost::detail::thread_data<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >::run() (thread.hpp:117)
by 0x5043818: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
by 0x5256B4F: start_thread (pthread_create.c:304)
Address 0x61A36B8 is 24 bytes inside a block of size 160 alloc'd
at 0x4C28A3A: operator new(unsigned long) (vg_replace_malloc.c:298)
by 0x42806A: boost::asio::detail::epoll_reactor::descriptor_state* boost::asio::detail::object_pool_access::create<boost::asio::detail::epoll_reactor::descriptor_state>() (object_pool.hpp:35)
by 0x4267B8: boost::asio::detail::object_pool<boost::asio::detail::epoll_reactor::descriptor_state>::alloc() (object_pool.hpp:89)
by 0x4229E3: boost::asio::detail::epoll_reactor::allocate_descriptor_state() (epoll_reactor.ipp:512)
by 0x4223D4: boost::asio::detail::epoll_reactor::register_descriptor(int, boost::asio::detail::epoll_reactor::descriptor_state*&) (epoll_reactor.ipp:151)
by 0x424405: boost::asio::detail::reactive_socket_service_base::do_assign(boost::asio::detail::reactive_socket_service_base::base_implementation_type&, int, int const&, boost::system::error_code&) (reactive_socket_service_base.ipp:182)
by 0x42DA98: boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::assign(boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::implementation_type&, boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (reactive_socket_service.hpp:117)
by 0x42D75C: boost::asio::stream_socket_service<boost::asio::ip::tcp>::assign(boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::implementation_type&, boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (stream_socket_service.hpp:138)
by 0x42D263: boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >::assign(boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (basic_socket.hpp:285)
by 0x42CAD7: boost::asio::detail::reactive_socket_accept_op_base<boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >, boost::asio::ip::tcp>::do_perform(boost::asio::detail::reactor_op*) (reactive_socket_accept_op.hpp:66)
by 0x409DE0: boost::asio::detail::reactor_op::perform() (reactor_op.hpp:40)
by 0x422C2F: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:622)
----------------------------------------------------------------
Possible data race during write of size 8 at 0x61A36A8 by thread #6
Locks held: none
at 0x410E9E: void boost::asio::detail::op_queue_access::next<boost::asio::detail::task_io_service_operation, boost::asio::detail::task_io_service_operation>(boost::asio::detail::task_io_service_operation*&, boost::asio::detail::task_io_service_operation*) (op_queue.hpp:41)
by 0x40EBEE: boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>::push(boost::asio::detail::task_io_service_operation*) (op_queue.hpp:107)
by 0x4228BB: boost::asio::detail::epoll_reactor::run(bool, boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>&) (epoll_reactor.ipp:431)
by 0x423629: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:396)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
by 0x42EB34: boost::_mfi::mf0<unsigned long, boost::asio::io_service>::operator()(boost::asio::io_service*) const (mem_fn_template.hpp:49)
by 0x42EA72: unsigned long boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> >::operator()<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list0>(boost::_bi::type<unsigned long>, boost::_mfi::mf0<unsigned long, boost::asio::io_service>&, boost::_bi::list0&, long) (bind.hpp:243)
by 0x42E91E: boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >::operator()() (bind_template.hpp:20)
by 0x42E65D: boost::detail::thread_data<boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > > >::run() (thread.hpp:117)
by 0x5043818: ??? (in /usr/lib/libboost_thread.so.1.53.0)
by 0x4C2D6FE: mythread_wrapper (hg_intercepts.c:219)
Address 0x61A36A8 is 8 bytes inside a block of size 160 alloc'd
at 0x4C28A3A: operator new(unsigned long) (vg_replace_malloc.c:298)
by 0x42806A: boost::asio::detail::epoll_reactor::descriptor_state* boost::asio::detail::object_pool_access::create<boost::asio::detail::epoll_reactor::descriptor_state>() (object_pool.hpp:35)
by 0x4267B8: boost::asio::detail::object_pool<boost::asio::detail::epoll_reactor::descriptor_state>::alloc() (object_pool.hpp:89)
by 0x4229E3: boost::asio::detail::epoll_reactor::allocate_descriptor_state() (epoll_reactor.ipp:512)
by 0x4223D4: boost::asio::detail::epoll_reactor::register_descriptor(int, boost::asio::detail::epoll_reactor::descriptor_state*&) (epoll_reactor.ipp:151)
by 0x424405: boost::asio::detail::reactive_socket_service_base::do_assign(boost::asio::detail::reactive_socket_service_base::base_implementation_type&, int, int const&, boost::system::error_code&) (reactive_socket_service_base.ipp:182)
by 0x42DA98: boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::assign(boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::implementation_type&, boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (reactive_socket_service.hpp:117)
by 0x42D75C: boost::asio::stream_socket_service<boost::asio::ip::tcp>::assign(boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::implementation_type&, boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (stream_socket_service.hpp:138)
by 0x42D263: boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >::assign(boost::asio::ip::tcp const&, int const&, boost::system::error_code&) (basic_socket.hpp:285)
by 0x42CAD7: boost::asio::detail::reactive_socket_accept_op_base<boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >, boost::asio::ip::tcp>::do_perform(boost::asio::detail::reactor_op*) (reactive_socket_accept_op.hpp:66)
by 0x409DE0: boost::asio::detail::reactor_op::perform() (reactor_op.hpp:40)
by 0x422C2F: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:622)
----------------------------------------------------------------
Thread #2: lock order "0x64C720 before 0x619E550" violated
Observed (incorrect) order is: acquisition of lock at 0x619E550
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408545: boost::asio::detail::posix_mutex::lock() (posix_mutex.hpp:52)
by 0x40D9E1: boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) (scoped_lock.hpp:36)
by 0x422BD3: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:611)
by 0x422D38: boost::asio::detail::epoll_reactor::descriptor_state::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) (epoll_reactor.ipp:648)
by 0x409C69: boost::asio::detail::task_io_service_operation::complete(boost::asio::detail::task_io_service&, boost::system::error_code const&, unsigned long) (task_io_service_operation.hpp:37)
by 0x4236AD: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:412)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
by 0x42EB34: boost::_mfi::mf0<unsigned long, boost::asio::io_service>::operator()(boost::asio::io_service*) const (mem_fn_template.hpp:49)
by 0x42EA72: unsigned long boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> >::operator()<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list0>(boost::_bi::type<unsigned long>, boost::_mfi::mf0<unsigned long, boost::asio::io_service>&, boost::_bi::list0&, long) (bind.hpp:243)
by 0x42E91E: boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >::operator()() (bind_template.hpp:20)
followed by a later acquisition of lock at 0x64C720
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408845: boost::asio::detail::posix_static_mutex::lock() (posix_static_mutex.hpp:44)
by 0x40E523: boost::asio::detail::scoped_lock<boost::asio::detail::posix_static_mutex>::scoped_lock(boost::asio::detail::posix_static_mutex&) (scoped_lock.hpp:36)
by 0x424EE7: boost::asio::detail::signal_set_service::deliver_signal(int) (signal_set_service.ipp:431)
by 0x42477C: boost::asio::detail::signal_set_service::pipe_read_op::do_perform(boost::asio::detail::reactor_op*) (signal_set_service.ipp:95)
by 0x409DE0: boost::asio::detail::reactor_op::perform() (reactor_op.hpp:40)
by 0x422C2F: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:622)
by 0x422D38: boost::asio::detail::epoll_reactor::descriptor_state::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) (epoll_reactor.ipp:648)
by 0x409C69: boost::asio::detail::task_io_service_operation::complete(boost::asio::detail::task_io_service&, boost::system::error_code const&, unsigned long) (task_io_service_operation.hpp:37)
by 0x4236AD: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:412)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
Required order was established by acquisition of lock at 0x64C720
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408845: boost::asio::detail::posix_static_mutex::lock() (posix_static_mutex.hpp:44)
by 0x40E523: boost::asio::detail::scoped_lock<boost::asio::detail::posix_static_mutex>::scoped_lock(boost::asio::detail::posix_static_mutex&) (scoped_lock.hpp:36)
by 0x425060: boost::asio::detail::signal_set_service::add_service(boost::asio::detail::signal_set_service*) (signal_set_service.ipp:467)
by 0x4248BB: boost::asio::detail::signal_set_service::signal_set_service(boost::asio::io_service&) (signal_set_service.ipp:128)
by 0x42558B: boost::asio::signal_set_service::signal_set_service(boost::asio::io_service&) (signal_set_service.hpp:53)
by 0x42B628: boost::asio::io_service::service* boost::asio::detail::service_registry::create<boost::asio::signal_set_service>(boost::asio::io_service&) (service_registry.hpp:81)
by 0x408742: boost::asio::detail::service_registry::do_use_service(boost::asio::io_service::service::key const&, boost::asio::io_service::service* (*)(boost::asio::io_service&)) (service_registry.ipp:123)
by 0x42A92F: boost::asio::signal_set_service& boost::asio::detail::service_registry::use_service<boost::asio::signal_set_service>() (service_registry.hpp:48)
by 0x42984A: boost::asio::signal_set_service& boost::asio::use_service<boost::asio::signal_set_service>(boost::asio::io_service&) (io_service.hpp:33)
by 0x428633: boost::asio::basic_io_object<boost::asio::signal_set_service, false>::basic_io_object(boost::asio::io_service&) (basic_io_object.hpp:90)
by 0x42753A: boost::asio::basic_signal_set<boost::asio::signal_set_service>::basic_signal_set(boost::asio::io_service&) (basic_signal_set.hpp:106)
followed by a later acquisition of lock at 0x619E550
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408545: boost::asio::detail::posix_mutex::lock() (posix_mutex.hpp:52)
by 0x40D9E1: boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) (scoped_lock.hpp:36)
by 0x4224E4: boost::asio::detail::epoll_reactor::register_internal_descriptor(int, int, boost::asio::detail::epoll_reactor::descriptor_state*&, boost::asio::detail::reactor_op*) (epoll_reactor.ipp:179)
by 0x4250FC: boost::asio::detail::signal_set_service::add_service(boost::asio::detail::signal_set_service*) (signal_set_service.ipp:485)
by 0x4248BB: boost::asio::detail::signal_set_service::signal_set_service(boost::asio::io_service&) (signal_set_service.ipp:128)
by 0x42558B: boost::asio::signal_set_service::signal_set_service(boost::asio::io_service&) (signal_set_service.hpp:53)
by 0x42B628: boost::asio::io_service::service* boost::asio::detail::service_registry::create<boost::asio::signal_set_service>(boost::asio::io_service&) (service_registry.hpp:81)
by 0x408742: boost::asio::detail::service_registry::do_use_service(boost::asio::io_service::service::key const&, boost::asio::io_service::service* (*)(boost::asio::io_service&)) (service_registry.ipp:123)
by 0x42A92F: boost::asio::signal_set_service& boost::asio::detail::service_registry::use_service<boost::asio::signal_set_service>() (service_registry.hpp:48)
by 0x42984A: boost::asio::signal_set_service& boost::asio::use_service<boost::asio::signal_set_service>(boost::asio::io_service&) (io_service.hpp:33)
by 0x428633: boost::asio::basic_io_object<boost::asio::signal_set_service, false>::basic_io_object(boost::asio::io_service&) (basic_io_object.hpp:90)
----------------------------------------------------------------
Thread #1: lock order "0x619E550 before 0x64C720" violated
Observed (incorrect) order is: acquisition of lock at 0x64C720
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408845: boost::asio::detail::posix_static_mutex::lock() (posix_static_mutex.hpp:44)
by 0x40E523: boost::asio::detail::scoped_lock<boost::asio::detail::posix_static_mutex>::scoped_lock(boost::asio::detail::posix_static_mutex&) (scoped_lock.hpp:36)
by 0x425166: boost::asio::detail::signal_set_service::remove_service(boost::asio::detail::signal_set_service*) (signal_set_service.ipp:492)
by 0x4248F0: boost::asio::detail::signal_set_service::shutdown_service() (signal_set_service.ipp:138)
by 0x42564D: boost::asio::signal_set_service::shutdown_service() (signal_set_service.hpp:110)
by 0x41AA69: boost::asio::detail::service_registry::~service_registry() (service_registry.ipp:37)
by 0x41AB32: boost::asio::io_service::~io_service() (io_service.ipp:53)
by 0x41B178: http::server3::server::~server() (in /root/server3/server3)
by 0x41A66A: main (main.cpp:37)
followed by a later acquisition of lock at 0x619E550
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408545: boost::asio::detail::posix_mutex::lock() (posix_mutex.hpp:52)
by 0x40D9E1: boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) (scoped_lock.hpp:36)
by 0x40AC3A: boost::asio::detail::epoll_reactor::deregister_descriptor(int, boost::asio::detail::epoll_reactor::descriptor_state*&, bool) (epoll_reactor.ipp:307)
by 0x4251BC: boost::asio::detail::signal_set_service::remove_service(boost::asio::detail::signal_set_service*) (signal_set_service.ipp:499)
by 0x4248F0: boost::asio::detail::signal_set_service::shutdown_service() (signal_set_service.ipp:138)
by 0x42564D: boost::asio::signal_set_service::shutdown_service() (signal_set_service.hpp:110)
by 0x41AA69: boost::asio::detail::service_registry::~service_registry() (service_registry.ipp:37)
by 0x41AB32: boost::asio::io_service::~io_service() (io_service.ipp:53)
by 0x41B178: http::server3::server::~server() (in /root/server3/server3)
by 0x41A66A: main (main.cpp:37)
Required order was established by acquisition of lock at 0x619E550
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408545: boost::asio::detail::posix_mutex::lock() (posix_mutex.hpp:52)
by 0x40D9E1: boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) (scoped_lock.hpp:36)
by 0x422BD3: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:611)
by 0x422D38: boost::asio::detail::epoll_reactor::descriptor_state::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) (epoll_reactor.ipp:648)
by 0x409C69: boost::asio::detail::task_io_service_operation::complete(boost::asio::detail::task_io_service&, boost::system::error_code const&, unsigned long) (task_io_service_operation.hpp:37)
by 0x4236AD: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:412)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
by 0x42EB34: boost::_mfi::mf0<unsigned long, boost::asio::io_service>::operator()(boost::asio::io_service*) const (mem_fn_template.hpp:49)
by 0x42EA72: unsigned long boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> >::operator()<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list0>(boost::_bi::type<unsigned long>, boost::_mfi::mf0<unsigned long, boost::asio::io_service>&, boost::_bi::list0&, long) (bind.hpp:243)
by 0x42E91E: boost::_bi::bind_t<unsigned long, boost::_mfi::mf0<unsigned long, boost::asio::io_service>, boost::_bi::list1<boost::_bi::value<boost::asio::io_service*> > >::operator()() (bind_template.hpp:20)
followed by a later acquisition of lock at 0x64C720
at 0x4C2C692: pthread_mutex_lock (hg_intercepts.c:495)
by 0x408845: boost::asio::detail::posix_static_mutex::lock() (posix_static_mutex.hpp:44)
by 0x40E523: boost::asio::detail::scoped_lock<boost::asio::detail::posix_static_mutex>::scoped_lock(boost::asio::detail::posix_static_mutex&) (scoped_lock.hpp:36)
by 0x424EE7: boost::asio::detail::signal_set_service::deliver_signal(int) (signal_set_service.ipp:431)
by 0x42477C: boost::asio::detail::signal_set_service::pipe_read_op::do_perform(boost::asio::detail::reactor_op*) (signal_set_service.ipp:95)
by 0x409DE0: boost::asio::detail::reactor_op::perform() (reactor_op.hpp:40)
by 0x422C2F: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:622)
by 0x422D38: boost::asio::detail::epoll_reactor::descriptor_state::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&, unsigned long) (epoll_reactor.ipp:648)
by 0x409C69: boost::asio::detail::task_io_service_operation::complete(boost::asio::detail::task_io_service&, boost::system::error_code const&, unsigned long) (task_io_service_operation.hpp:37)
by 0x4236AD: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>&, boost::asio::detail::task_io_service_thread_info&, boost::system::error_code const&) (task_io_service.ipp:412)
by 0x423302: boost::asio::detail::task_io_service::run(boost::system::error_code&) (task_io_service.ipp:153)
by 0x42393A: boost::asio::io_service::run() (io_service.ipp:59)
答案 0 :(得分：2)
HTTP Server 3 example使用一个线程池。虽然Valgrind是一套非常有用的程序套件，但正确使用它需要一些机智。作为helgrind documentation states，最好在项目早期开始使用helgrind。在helgrind上抛出现有的多线程程序很可能会在我的经历中报告许多误报。例如，在使用posix条件变量时，helgrind无法始终检测数据竞争，此引用来自我之前链接的helgrind文档
避免使用POSIX条件变量。如果可以，请使用POSIX信号量 （sem_t，sem_post，sem_wait）进行线程间事件信令。 初始值为零的信号量特别有用 此
这可能是您引用的误报的原因。 Asio和Thread库都使用条件变量作为其实现的一部分。我非常怀疑可能的数据争用或不正确的锁定顺序是由于任一库中的错误。这里值得引用Jeff Atwood's First Rule of Programming
成为一名谦逊的程序员的一个重要部分就是实现这一目标 每当你编写的代码出现问题时，它总是存在 你的错。操作系统，编译器中可能存在错误， 或第三方产品 - 但这不应该是你的第一个想法。 应用程序代码中存在错误的可能性要大得多 正在开发中。