g++ boo_t.cpp -L../resource/boost_1_35_0/bin.v2/libs/thread/build/gcc-4.1.2/release/threading-multi/libboost_thread-gcc41-mt-1_35.so.1.35.0 -Lpthread boo_t.cpp: In function ‘void increment_count()’: boo_t.cpp:14: error: reference to ‘mutex’ is ambiguous boo_t.cpp:10: error: candidates are: boost::mutex mutex /usr/include/boost/thread/mutex.hpp:35: error: class boost::mutex code: #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <iostream> using namespace std; using namespace boost; int count = 0; boost::mutex mutex; void increment_count() { boost::mutex::scoped_lock lock(mutex); std::cout << "count = " << ++count << std::endl; } int main(int argc, char* argv[]) { boost::thread_group threads; for (int i = 0; i < 10; ++i) threads.create_thread(&increment_count); threads.join_all(); "boo_t.cpp" 24L, 480C 1,1 Top c -- Peisheng Wang Software Engineer iZENEsoft (Shanghai) Co., Ltd Room 601 Marine Tower, No. 1 Pudong Ave. Tel:86-21-68860698-114 Fax:86-21-68860699 Company Website:<a target="_blank" href="http://www.izenesoft.com/">www.izenesoft.com</a> <a href="../../../../index.php?menuaction=felamimail.uicompose.compose&send_to=Wmhlbi5ZdUBNb3JnYW5TdGFubGV5LmNvbQ==">Zhen.Yu@MorganStanley.com</a>