Hi, I am a newbie. I would like to run a simple threaded program using boost. I got a sample file see below and compile with the following command g++ simple.cpp -lthread I got error //// In file included from /usr/include/boost/thread/detail/config.hpp:18, from /usr/include/boost/thread/thread.hpp:15, from /usr/include/boost/thread.hpp:15, from simple.cpp:9: /usr/include/boost/config/requires_threads.hpp:47:5: #error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)" In file included from /usr/include/boost/thread/thread.hpp:19, from /usr/include/boost/thread.hpp:15, from simple.cpp:9: /usr/include/boost/thread/mutex.hpp:58: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:58: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:58: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:58: error: (use `=' to initialize static data members) /usr/include/boost/thread/mutex.hpp:58: error: variable or field `do_lock' declared void /usr/include/boost/thread/mutex.hpp:58: error: declaration of `int boost::mutex::do_lock' /usr/include/boost/thread/mutex.hpp:56: error: conflicts with previous declaration `void boost::mutex::do_lock()' /usr/include/boost/thread/mutex.hpp:59: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:59: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:59: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:59: error: variable or field `do_unlock' declared void /usr/include/boost/thread/mutex.hpp:59: error: declaration of `int boost::mutex::do_unlock' /usr/include/boost/thread/mutex.hpp:57: error: conflicts with previous declaration `void boost::mutex::do_unlock()' /usr/include/boost/thread/mutex.hpp:100: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:100: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:100: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:100: error: variable or field `do_lock' declared void /usr/include/boost/thread/mutex.hpp:100: error: declaration of `int boost::try_mutex::do_lock' /usr/include/boost/thread/mutex.hpp:97: error: conflicts with previous declaration `void boost::try_mutex::do_lock()' /usr/include/boost/thread/mutex.hpp:101: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:101: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:101: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:101: error: variable or field `do_unlock' declared void /usr/include/boost/thread/mutex.hpp:101: error: declaration of `int boost::try_mutex::do_unlock' /usr/include/boost/thread/mutex.hpp:99: error: conflicts with previous declaration `void boost::try_mutex::do_unlock()' /usr/include/boost/thread/mutex.hpp:144: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:144: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:144: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:144: error: variable or field `do_lock' declared void /usr/include/boost/thread/mutex.hpp:144: error: declaration of `int boost::timed_mutex::do_lock' /usr/include/boost/thread/mutex.hpp:140: error: conflicts with previous declaration `void boost::timed_mutex::do_lock()' /usr/include/boost/thread/mutex.hpp:145: error: `cv_state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:145: error: `state' was not declared in this scope /usr/include/boost/thread/mutex.hpp:145: error: invalid data member initialization /usr/include/boost/thread/mutex.hpp:145: error: variable or field `do_unlock' declared void /usr/include/boost/thread/mutex.hpp:145: error: declaration of `int boost::timed_mutex::do_unlock' /usr/include/boost/thread/mutex.hpp:143: error: conflicts with previous declaration `void boost::timed_mutex::do_unlock()' In file included from /usr/include/boost/thread.hpp:19, from simple.cpp:9: /usr/include/boost/thread/once.hpp:35: error: type specifier omitted for parameter `once_flag' /usr/include/boost/thread/once.hpp:35: error: parse error before `&' token In file included from /usr/include/boost/thread.hpp:20, from simple.cpp:9: /usr/include/boost/thread/recursive_mutex.hpp:55: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:55: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:55: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:55: error: variable or field ` do_lock' declared void /usr/include/boost/thread/recursive_mutex.hpp:55: error: declaration of `int boost::recursive_mutex::do_lock' /usr/include/boost/thread/recursive_mutex.hpp:53: error: conflicts with previous declaration `void boost::recursive_mutex::do_lock()' /usr/include/boost/thread/recursive_mutex.hpp:56: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:56: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:56: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:56: error: variable or field ` do_unlock' declared void /usr/include/boost/thread/recursive_mutex.hpp:56: error: declaration of `int boost::recursive_mutex::do_unlock' /usr/include/boost/thread/recursive_mutex.hpp:54: error: conflicts with previous declaration `void boost::recursive_mutex::do_unlock()' /usr/include/boost/thread/recursive_mutex.hpp:103: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:103: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:103: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:103: error: variable or field ` do_lock' declared void /usr/include/boost/thread/recursive_mutex.hpp:103: error: declaration of `int boost::recursive_try_mutex::do_lock' /usr/include/boost/thread/recursive_mutex.hpp:100: error: conflicts with previous declaration `void boost::recursive_try_mutex::do_lock()' /usr/include/boost/thread/recursive_mutex.hpp:104: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:104: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:104: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:104: error: variable or field ` do_unlock' declared void /usr/include/boost/thread/recursive_mutex.hpp:104: error: declaration of `int boost::recursive_try_mutex::do_unlock' /usr/include/boost/thread/recursive_mutex.hpp:102: error: conflicts with previous declaration `void boost::recursive_try_mutex::do_unlock()' /usr/include/boost/thread/recursive_mutex.hpp:154: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:154: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:154: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:154: error: variable or field ` do_lock' declared void /usr/include/boost/thread/recursive_mutex.hpp:154: error: declaration of `int boost::recursive_timed_mutex::do_lock' /usr/include/boost/thread/recursive_mutex.hpp:150: error: conflicts with previous declaration `void boost::recursive_timed_mutex::do_lock()' /usr/include/boost/thread/recursive_mutex.hpp:155: error: `cv_state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:155: error: `state' was not declared in this scope /usr/include/boost/thread/recursive_mutex.hpp:155: error: invalid data member initialization /usr/include/boost/thread/recursive_mutex.hpp:155: error: variable or field ` do_unlock' declared void /usr/include/boost/thread/recursive_mutex.hpp:155: error: declaration of `int boost::recursive_timed_mutex::do_unlock' /usr/include/boost/thread/recursive_mutex.hpp:153: error: conflicts with previous declaration `void boost::recursive_timed_mutex::do_unlock()' ///////////////////////// If I use commend g++ simple.cpp -pthread I got error //////// /tmp/cchxK5CW.o(.text+0x66): In function `main': : undefined reference to `boost::thread::thread[in-charge](boost::function0<void, std::allocator<boost::function_base> > const&)' /tmp/cchxK5CW.o(.text+0x9d): In function `main': : undefined reference to `boost::thread::join()' /tmp/cchxK5CW.o(.text+0xa8): In function `main': : undefined reference to `boost::thread::~thread [in-charge]()' /tmp/cchxK5CW.o(.text+0xc2): In function `main': : undefined reference to `boost::thread::~thread [in-charge]()' collect2: ld returned 1 exit status /////////// I do not know what went wrong. Can anyone tell me what I did wrong? How should I correct so that I can compile this example? TIA Tuan ========== #include <boost/thread.hpp> #include <iostream> using namespace std; void ciao() { cout << "Ciao, thread using boost" << endl; } /******** this is the main thread's code */ int main(int argc,char *argv[]) { boost::thread thrd(&ciao); thrd.join(); return(0); }