ich versuche gerade mit boost::threads mein glück;-) habe ne fragen...warum wird hier gib 10 gezählt? irgend etwas läuft hier schief...
anders fällt mir nix ein, wie man ne schleifenbedingung schützen kann, ohne die ganze schleife zu locken.

cu

#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <iostream>
#include <windows.h>

boost::mutex io_mutex;
unsigned int counter=0;

inline int readcounter()
{
	{
	boost::mutex::scoped_lock
		lock(io_mutex);
	}

	return counter;
} 

void thread1()
{
  while(readcounter()<10)
  {
	  {	 
      boost::mutex::scoped_lock
        lock(io_mutex);

	  ++counter;

	  std::cout << "Thread1: " << counter << std::endl;
	  }
	  Sleep(100);
   }
}

void thread2()
{
  while(readcounter()<10)
  {
	  {	  
      boost::mutex::scoped_lock
		  lock(io_mutex);

		  ++counter;

	      std::cout << "Thread2: " << counter << std::endl;
	  }
	  Sleep(100);
    }
}

int main ()
{
  boost::thread thrd1 ( &thread1 );
  boost::thread thrd2 ( &thread2  );

  while(readcounter()<10)
  {
	  {	 
      boost::mutex::scoped_lock
        lock(io_mutex);

	  ++counter;

	  std::cout << "main thread: " << counter << std::endl;
	  }
	  Sleep(100);
   }

  thrd1.join();
  thrd2.join();

  std::cin.get();
}

ausgabe:
---------------------------
Thread1: 1
Thread2: 2
main thread: 3
Thread1: 4
Thread2: 5
main thread: 6
Thread1: 7
Thread2: 8
main thread: 9
Thread1: 10