rtdllexample.c

windows系统下实时代码,可以进行底层硬件的实时操作

/*++
 *
 * Copyright (c) 1998-2005 Ardence, Inc.  All rights reserved.
 *
 * Module Name:
 *
 *	RtdllExample.c
 *
 * Abstract:
 *
 *	Rtdll example -- contains the functions "SetCount", "GetCount", and "IncrementCount" that
 *                  use per-process private data(PPPD), allocated for each RTSS process.
 *
 * Author:
 *
 *	Lev Zaltsman    3/1/2000
 *
 * Environment:
 *
 *	 RTX application (RTSS). 
 *
 * Revision History:
 * 
 *     Revision1: Initial(LDZ)
 *     Revision2: added PPPD macros(LDZ)
 *     Revision3: added initial counters for every process (LT)
 *
--*/

#include "windows.h"
#include "rtapi.h"
#include "pppd.h"

static int thread_counter; // number ofh threads, which use this DLL

//
// Define the per-process private data variable(s).
// This definition would be moved to a header file.
//
PPPD_DATA_BEGIN

long	item1;		// current count
long	proc_num;   // initial count

PPPD_DATA_END

// Only one module must allocate the per-process private data variable(s).
// All other modules will use PPPD_EXTERN
PPPD_ALLOCATE

//
// The exported Rtdll functions
//
__declspec ( dllexport )
void _stdcall
SetCount(
	int count
	)
{
	PPPD_FUNC_ENTRY;
	PPPD(item1) = count+100*PPPD(proc_num);
}

__declspec ( dllexport )
int _stdcall
GetCount(void)
{ 

	PPPD_FUNC_ENTRY;

	return PPPD(item1);
}

__declspec ( dllexport )
void _stdcall
IncrementCount(void)
{
	PPPD_FUNC_ENTRY;

	PPPD(item1) += 1;
}


//
// DllMain must Explicitly return True
//
BOOL WINAPI _stdcall DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
  PPPD_FUNC_ENTRY;

  switch (fdwReason)
  {
    case DLL_THREAD_ATTACH:
      PPPD(proc_num) = ++thread_counter;
	  break;

	case DLL_THREAD_DETACH:
      thread_counter--;
	  break;
  }

   return TRUE;
}