#define __THREADS_MAIN#include <thread.h>#include <string>extern "C" {#  include <unistd.h>};cond t_control;mutex t_link;string s;class producer : public pthread {public:  producer() { };  ~producer() { };  int thread(void *)    {      char *buf = new char[80];      cout << "Enter text for consumer: ";      cout.flush();      cin.getline(buf,80);      t_link.lock();      s = buf;      t_control.signal();      t_link.unlock();      delete buf;      return 0;    }};class consumer : public pthread {public:  consumer() { };  ~consumer() { };  int thread(void *)    {      int r;      t_link.lock();      t_control.wait(t_link);      cout << "Consumed: '" << s << "'\n";      r = s.length();      t_link.unlock();      return r;    }};voidhexdump(const unsigned char *ptr, int len){  string s;  int i = 0;  while(i < len) {    if( (i%16) == 0 ) {      if ( i > 0 )	cout << " ;" << s.c_str() << endl;      cout.form("%08X ",(int)ptr);      s = "";    }    cout.form(" %02X",(unsigned int)ptr[i]);    if ( isprint(ptr[i]) )      s += ptr[i];    else      s += '.';    i += 1;  }  while( (i%16) )    cout << "   ",i++;  cout << " ;" << s.c_str() << endl;}int main(){  pthread *p1, *p2;  p1 = new consumer;  p2 = new producer;  p1->join();  cout << "return value " << p1->retcode() << endl;}