port.h

这是状态机的一个框架结构的例子,可以作为状态机的基本架构

/******************************************************************** 
 * Quantum Framework Win32 port declarations (C version)
 * Copyright (c) 2002 Miro Samek, Palo Alto, CA.
 * All Rights Reserved.
 *******************************************************************/
#ifndef port_h
#define port_h

#include "qf_win32.h"
#include "qfpkg.h"

/* Win32-specific critical section operations */
extern  CRITICAL_SECTION      pkgWin32CritSect;
#define QF_PROTECT()          EnterCriticalSection(&pkgWin32CritSect)
#define QF_UNPROTECT()        LeaveCriticalSection(&pkgWin32CritSect)
#define QF_ISR_PROTECT()      QF_PROTECT()
#define QF_ISR_UNPROTECT()    QF_UNPROTECT()

/* Win32-specific event queue operations */
#define QF_EQUEUE_INIT(q_) \
   ((q_)->osEvent__ = CreateEvent(NULL, FALSE, FALSE, NULL))
#define QF_EQUEUE_CLEANUP(q_) CloseHandle((q_)->osEvent__)
#define QF_EQUEUE_WAIT(q_) \
   QF_UNPROTECT(); \
   do { \
      WaitForSingleObject((q_)->osEvent__, INFINITE); \
   } while ((q_)->frontEvt__ == 0); \
   QF_PROTECT()
#define QF_EQUEUE_SIGNAL(q_) \
   QF_UNPROTECT(); \
   SetEvent((q_)->osEvent__)
#define QF_EQUEUE_ONEMPTY(q_)

/* Win32-specific event pool operations */
#define QF_EPOOL              QEPool
#define QF_EPOOL_INIT(p_, poolSto_, nEvts_, evtSize_) \
   QEPoolCtor(p_, poolSto_, nEvts_, evtSize_); 
#define QF_EPOOL_GET(p_, e_)  ((e_) = QEPoolGet(p_))
#define QF_EPOOL_PUT(p_, e_)  (QEPoolPut(p_, e_))

         /* the following constant may be bumped up to 15 (inclusive)
          * before redesign of algorithms is necessary
          */ 
enum { QF_MAX_ACTIVE = 15 };

#endif                                                   /* port_h */