buffer.c

来自「多线程库」· C语言 代码 · 共 51 行

//
// This example demonstrates semaphores.
//

#include <thread.h>
#include <thread_semaphore.h>

#include <string>

class typeit : public pthread {
protected:
  semaphore t_sem;
  string s;
  int i;

public:
  typeit() { t_sem.wait(); i=0; t_sem.post(); };
  ~typeit() { };

  char text() 
    {
      if ( t_sem.trywait() >= 0 )
	return s[i++];
      return 0;
    }
  int thread(void *) 
    {
      int n=0;
      char buf[80];

      cout << "launched" << endl;
      cin.getline(buf,80);
      n = strlen(buf);
      while( n-- > 0 )
	t_sem.post();
      s = buf;
      return 0;
    }
};

int main()
{
  char ch=0;
  typeit data;

  while( (ch=data.text()) != 0 )
    cout << ch;
  cout << "." << endl;
  exit(0);
}