Problem with boost:thread
Hey, I'm trying to start a thread from a Class but the only way I did it was using a pointer. The thing is that when I assign the thread to the pointer it wont start unless I use join(). I need it to star right away is created just like when I create a thread (boost::thread myThread(funcName);) I was trying to use thread_group to do this, but create_thread is not working. *Here's an example of what I was doing:* *(Here I used the pointer)* class Thread { public: Thread(){}; virtual ~Thread(){}; virtual void run() = 0; void start(){m_Thread = new boost::thread( &Thread::run, this ); }; //wont start unless I add m_Thread.join(); private: boost::thread* m_Thread; }; *and now... I am trying to use thread_group:* class Thread { public: Thread(){}; virtual ~Thread(){}; virtual void run() = 0; void start(){g_Thread.create_thread(&Thread::run); }; private: boost::thread_group g_Thread; }; *But I receive an error:* /usr/local/include/boost/thread/detail/thread.hpp: In member function 'void boost::detail::thread_data<F>::run() [with F = void (Thread::*)()]': main.cpp:61: instantiated from here /usr/local/include/boost/thread/detail/thread.hpp:56: error: must use '.*' or '->*' to call pointer-to-member function in '((boost::detail::thread_data<void (Thread::*)()>*)this)->boost::detail::thread_data<void (Thread::*)()>::f (...)' make[2]: *** [build/Debug/GNU-MacOSX/main.o] Error 1 Im using netBeans on Mac OS X 10.6.2 Anyone knows how should I create this? or how to use simple boost::thread and launch it without using join()?? Thanks!!! Dann
void start(){m_Thread = new boost::thread( &Thread::run, this ); }; //wont start unless I add m_Thread.join();
The thread is created and started anyway. Join() just tells the *caller* thread to wait until m_Thread finishes.
void start(){g_Thread.create_thread(&Thread::run); };
g_Thread.create_thread(boost::bind(&Thread::run, this));
Thanks! But I said that the thread wont start because in other class I defined, that inherits from this "Thread" class. I implemented the abstract run() method so it just prints a line to the output: class Trash : public Thread { std::string garbage; public : Trash(std::string newString){garbage = newString;}; void run(){ std::cout << "RUNNING" << std::endl;}; } int main(int argc, char** argv) { Trash myTrash("hello"); myTrash.start(); } and whenever I run the project (using boost::thread or using boost::thread_group with the correction you provided) it wont show the output... "RUNNING". BUT, if I add m_Thread.join(); it shows that output. Any idea why? Thanks!! On Thu, Mar 4, 2010 at 1:02 PM, Igor R <boost.lists@gmail.com> wrote:
void start(){m_Thread = new boost::thread( &Thread::run, this ); }; //wont start unless I add m_Thread.join();
The thread is created and started anyway. Join() just tells the *caller* thread to wait until m_Thread finishes.
void start(){g_Thread.create_thread(&Thread::run); };
g_Thread.create_thread(boost::bind(&Thread::run, this)); _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
True. I added a useless cin just to see what happens and as the program is still "alive" I get to see the thread. Do you know how can I avoid the main thread to end before my thread is executed? Thanks!! Dann On Thu, Mar 4, 2010 at 1:17 PM, Igor R <boost.lists@gmail.com> wrote:
Trash myTrash("hello"); myTrash.start();
At this point your main thread *ends* and the program ends, so the 2nd thread doesn't have an opportunity to do anything. That's why you need to wait for the 2nd thread -- by means of join(). _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
Thank you VERY much!! Everything's clear now Dann On Thu, Mar 4, 2010 at 1:33 PM, Igor R <boost.lists@gmail.com> wrote:
Do you know how can I avoid the main thread to end before my thread is executed?
Use join(). _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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