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<blockquote data-quote="kwikius" data-source="post: 2559863">FWIW I believe that Boost.Threads is well regarded, widely availableand portable as well as being discussed in the context of concurrentprogramming for C++ by the standardisation committee, so IMO it isquite acceptable to discuss in the context of the C++ languagenewsgroup:<a href="http://www.boost.org/doc/html/threads.html">http://www.boost.org/doc/html/threads.html</a>Below is a program that demonstrates the sort of functionalitydescribed by the OP. To run it you will need to download and build theBoost.Threads threads library in the boost distro. <a href="http://www.boost.org">http://www.boost.org</a>regardsAndy Little--------------------#include &lt;boost/thread/thread.hpp&gt;#include &lt;boost/date_time/posix_time/posix_time.hpp&gt;#include &lt;iostream&gt;#include &lt;string&gt;/*&nbsp; &nbsp; thread demo. Give user 7 seconds to enter a string*/struct call_back_timer{&nbsp; &nbsp; typedef&nbsp; boost:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />osix_time::time_duration time_duration;&nbsp; &nbsp; typedef&nbsp; boost:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />osix_time:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />time ptime;&nbsp; &nbsp; typedef&nbsp; boost:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />osix_time::second_clock second_clock;&nbsp; &nbsp; static void reset_flag()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; flag = false;&nbsp; &nbsp; }&nbsp; &nbsp; static void set_flag()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; flag = true;&nbsp; &nbsp; }&nbsp; &nbsp; call_back_timer(&nbsp; &nbsp; &nbsp; &nbsp; time_duration const &amp; p, // interval&nbsp; &nbsp; &nbsp; &nbsp; int c,&nbsp; // number of cycles to repeat&nbsp; &nbsp; &nbsp; &nbsp; void(*f1)(int current,int tot ),&nbsp; // per cycle function withcount arg&nbsp; &nbsp; &nbsp; &nbsp; void(*f2)() // end function&nbsp; &nbsp; )&nbsp; &nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />eriod(p),count(c),pf1(f1),pf2(f2){}private:&nbsp; &nbsp; int count;&nbsp; &nbsp; static bool flag;&nbsp; &nbsp; const time_duration&nbsp; period;&nbsp; &nbsp; void(*pf1)(int n,int count);&nbsp; &nbsp; void(*pf2)();public:&nbsp; &nbsp; void operator()()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; ptime t = second_clock::local_time();&nbsp; &nbsp; &nbsp; &nbsp; for (int n = 0; n &lt;= count;++n){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t += period;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; while(&nbsp; second_clock::local_time() &lt; t)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (!flag){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pf1(n,count);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; pf2();&nbsp; &nbsp; }};bool call_back_timer::flag = true;void print_time(int n,int count){&nbsp; &nbsp; if ( (count -n) &gt; 0){&nbsp; &nbsp; &nbsp; &nbsp; std::cout &lt;&lt; &quot;you have &quot;&lt;&lt; (count - n) &lt;&lt; &quot; seconds left\n&quot;;&nbsp; &nbsp; }&nbsp; &nbsp; else {&nbsp; &nbsp; &nbsp; &nbsp; std::cout &lt;&lt; &quot;\nSorry... too late. Press return to quit\n&quot;;&nbsp; &nbsp; }}struct user_input{private:&nbsp; &nbsp; static bool flag;&nbsp; &nbsp; void(*pf)();public:&nbsp; &nbsp; static void set_flag()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; flag = true;&nbsp; &nbsp; }&nbsp; &nbsp; static void reset_flag()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; flag = false;&nbsp; &nbsp; }&nbsp; &nbsp; user_input(void(*f)())<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />f(f){}&nbsp; &nbsp; void operator()()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; std::cout &lt;&lt; &quot; Enter a string and press return: &quot;;&nbsp; &nbsp; &nbsp; &nbsp; std::string str;&nbsp; &nbsp; &nbsp; &nbsp; getline(std::cin, str);&nbsp; &nbsp; &nbsp; &nbsp; if (flag){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std::cout &lt;&lt; &quot;\nyou entered '&quot; &lt;&lt; str &lt;&lt; &quot;'\n&quot;;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; pf();&nbsp; &nbsp; }};bool user_input::flag = true;int main(){&nbsp; &nbsp; call_back_timer timer(&nbsp; &nbsp; &nbsp; &nbsp; boost:<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />osix_time::seconds(1),&nbsp; &nbsp; &nbsp; &nbsp; 5,&nbsp; &nbsp; &nbsp; &nbsp; print_time,&nbsp; &nbsp; &nbsp; &nbsp; user_input::reset_flag&nbsp; &nbsp; );&nbsp; &nbsp; timer.set_flag();&nbsp; &nbsp; user_input user(call_back_timer::reset_flag);&nbsp; &nbsp; user.set_flag();&nbsp; &nbsp; boost::thread_group thrds;&nbsp; &nbsp; thrds.create_thread(user);&nbsp; &nbsp; thrds.create_thread(timer);&nbsp; &nbsp; thrds.join_all();&nbsp; }</blockquote>

[QUOTE="kwikius, post: 2559863"] FWIW I believe that Boost.Threads is well regarded, widely available and portable as well as being discussed in the context of concurrent programming for C++ by the standardisation committee, so IMO it is quite acceptable to discuss in the context of the C++ language newsgroup: [URL]http://www.boost.org/doc/html/threads.html[/URL] Below is a program that demonstrates the sort of functionality described by the OP. To run it you will need to download and build the Boost.Threads threads library in the boost distro. [URL]http://www.boost.org[/URL] regards Andy Little -------------------- #include <boost/thread/thread.hpp> #include <boost/date_time/posix_time/posix_time.hpp> #include <iostream> #include <string> /* thread demo. Give user 7 seconds to enter a string */ struct call_back_timer{ typedef boost::posix_time::time_duration time_duration; typedef boost::posix_time::ptime ptime; typedef boost::posix_time::second_clock second_clock; static void reset_flag() { flag = false; } static void set_flag() { flag = true; } call_back_timer( time_duration const & p, // interval int c, // number of cycles to repeat void(*f1)(int current,int tot ), // per cycle function with count arg void(*f2)() // end function ) :period(p),count(c),pf1(f1),pf2(f2){} private: int count; static bool flag; const time_duration period; void(*pf1)(int n,int count); void(*pf2)(); public: void operator()() { ptime t = second_clock::local_time(); for (int n = 0; n <= count;++n){ t += period; while( second_clock::local_time() < t) { if (!flag){ return; } } pf1(n,count); } pf2(); } }; bool call_back_timer::flag = true; void print_time(int n,int count) { if ( (count -n) > 0){ std::cout << "you have "<< (count - n) << " seconds left\n"; } else { std::cout << "\nSorry... too late. Press return to quit\n"; } } struct user_input{ private: static bool flag; void(*pf)(); public: static void set_flag() { flag = true; } static void reset_flag() { flag = false; } user_input(void(*f)()):pf(f){} void operator()() { std::cout << " Enter a string and press return: "; std::string str; getline(std::cin, str); if (flag){ std::cout << "\nyou entered '" << str << "'\n"; } pf(); } }; bool user_input::flag = true; int main() { call_back_timer timer( boost::posix_time::seconds(1), 5, print_time, user_input::reset_flag ); timer.set_flag(); user_input user(call_back_timer::reset_flag); user.set_flag(); boost::thread_group thrds; thrds.create_thread(user); thrds.create_thread(timer); thrds.join_all(); } [/QUOTE]

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