Dear all, I got a compiler(gcc 3.4.5) error while using boost.thread: ----------------------------------------------------------------------------- g++ -IC:\Program Files\boost\boost_1_40 -O0 -g3 -Wall -c -fmessage-length=0 -omain.o ..\main.cpp C:/Program Files/boost/boost_1_40/boost/thread/win32/basic_timed_mutex.hpp: In member function `bool boost::detail::basic_timed_mutex::timed_lock(const Duration&) [with Duration = bool]': C:/Program Files/boost/boost_1_40/boost/thread/locks.hpp:353: instantiated from `bool boost::unique_lock<Mutex>::timed_lock(const TimeDuration&) [with TimeDuration = bool, Mutex = boost::mutex]' C:/Program Files/boost/boost_1_40/boost/thread/locks.hpp:241: instantiated from `boost::unique_lock<Mutex>::unique_lock(Mutex&, const TimeDuration&) [with TimeDuration = bool, Mutex = boost::mutex]' ..\main.cpp:17: instantiated from here C:/Program Files/boost/boost_1_40/boost/thread/win32/basic_timed_mutex.hpp:118: error: no match for 'operator+' in 'boost::get_system_time() + timeout' C:/Program Files/boost/boost_1_40/boost/date_time/time.hpp:140: note: candidates are: T boost::date_time::base_time<T, time_system>::operator+(const typename time_system::date_duration_type&) const [with T = boost::posix_time::ptime, time_system = boost::posix_time::posix_time_system] C:/Program Files/boost/boost_1_40/boost/date_time/time.hpp:160: note: T boost::date_time::base_time<T, time_system>::operator+(const typename time_system::time_duration_type&) const [with T = boost::posix_time::ptime, time_system = boost::posix_time::posix_time_system] C:/Program Files/boost/boost_1_40/boost/operators.hpp:255: note: boost::date_time::date_duration<boost::gregorian::date_duration_rep> boost::operator+(const boost::date_time::date_duration<boost::gregorian::date_duration_rep>&, const boost::date_time::date_duration<boost::gregorian::date_duration_rep>&) C:/Program Files/boost/boost_1_40/boost/date_time/posix_time/date_duration_operators.hpp:76: note: boost::posix_time::ptime boost::posix_time::operator+(const boost::posix_time::ptime&, const boost::gregorian::years&) C:/Program Files/boost/boost_1_40/boost/date_time/posix_time/date_duration_operators.hpp:32: note: boost::posix_time::ptime boost::posix_time::operator+(const boost::posix_time::ptime&, const boost::gregorian::months&) C:/Program Files/boost/boost_1_40/boost/date_time/date_duration_types.hpp:245: note: boost::gregorian::date boost::date_time::operator+(const boost::gregorian::date&, const boost::date_time::years_duration<boost::gregorian::greg_durations_config>&) C:/Program Files/boost/boost_1_40/boost/date_time/date_duration_types.hpp:133: note: boost::gregorian::date boost::date_time::operator+(const boost::gregorian::date&, const boost::date_time::months_duration<boost::gregorian::greg_durations_config>&) Build error occurred, build is stopped ----------------------------------------------------------------------------------------------------------------------------- The following is my code: ----------------------------------------------------------------------------------------------------------------------------- #include <boost/thread/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/bind.hpp> #include <iostream> boost::mutex io_mutex; void count(int id) { boost::mutex::scoped_lock lock(io_mutex,false); for (int i = 0; i < 10; ++i) { lock.lock(); std::cout << id << ": " << i << std::endl; lock.unlock(); } } int main(int argc, char* argv[]) { boost::thread thrd1(count, 1); boost::thread thrd2(count, 2); thrd1.join(); thrd2.join(); return 0; } ----------------------------------------------------------------------------- I know I can just abandon the lock() and unlock() function since the constructor and destructor will do them for me. But I can't understand how this error occurs and why the compiler has something to do with basic_timed_mutex. Anyone can give me some clues? Thanks in advance.