#ifndef _PT_SEM_H_
#define _PT_SEM_H_
#include "PT.H"
////////////////////////////////////////////////////////////////
//信号量
struct pt_sem {
  unsigned int count;
};
//初始化信号量
#define PT_SEM_INIT(s, c) (s)->count = c
//等待信号量
#define PT_SEM_WAIT(pt, s)	\
  do {						\
    PT_WAIT_UNTIL(pt, (s)->count > 0);		\
    --(s)->count;				\
  } while(0)
//设置信号量
#define PT_SEM_SIGNAL(pt, s) ++(s)->count
#endif