detached.c

用c++包装好的线程库,直接拿来使用,提高效率.

#include <thread.h>

#include <iostream>

int exitCond=0;

using namespace cpp_threads;

class simple : public Pthread {
protected:
  Semaphore m_sem;

public:
  simple() { };
  ~simple() { }

  int thread(void *)
  {
    std::cout << "thread started." << std::endl;
    while (!exitCond) {
      m_sem.wait();
      std::cout << "now doing some major tasks" << std::endl;
      sleep(5);
    }
    std::cout << "phew... ending" << std::endl;
    return 0;
  }

  Semaphore& sem() { return m_sem; };

};

int
main()
{
  simple *th = new simple();

  std::cout << "Threads are like variables in a main program" << std::endl;
  std::cout << "so when the main program ends, so do the threads" << std::endl;
  std::cout << "as like any variable, it is cleaned up on exit." << std::endl;
  std::cout << "To make a thread independant of the main program," <<std::endl;
  std::cout << "set the pthread::set_detached to true." << std::endl;
  th->run(); // tell the thread to run ahead
  sleep(1);
  // Make the thread an independant process.
  th->set(Pthread::set_detached_e,true);
  th->sem().post();  // Thread to do some tasks.
  sleep(5);
  th->sem().post();
  exitCond = 1;
  exit(0);
}