fs_x_win32.c

ucfs文件系统pc版的demo演示

/*
**********************************************************************
*                          Micrium, Inc.
*                      949 Crestview Circle
*                     Weston,  FL 33327-1848
*
*                            uC/FS
*
*             (c) Copyright 2001 - 2006, Micrium, Inc.
*                      All rights reserved.
*
***********************************************************************

----------------------------------------------------------------------
----------------------------------------------------------------------
File        : FS_X_Win32.c
Purpose     : Win32 API OS Layer for the file system
----------------------------------------------------------------------
Known problems or limitations with current version
----------------------------------------------------------------------
None.
---------------------------END-OF-HEADER------------------------------
*/

/*********************************************************************
*
*             #include Section
*
**********************************************************************
*/

#include "FS_Int.h"
#include "FS_OS.h"
#include "FS_Conf.h"

#include <time.h>
#include <windows.h>
#include <stdio.h>

/*********************************************************************
*
*       Local types
*
**********************************************************************
*/
typedef struct {
  HANDLE hSema;
  char   acName[60];
  int    OpenCnt;
}  LOCK_INST;
/*********************************************************************
*
*       Static data
*
**********************************************************************
*/
static LOCK_INST * _paInst;
static char _IsInited;


/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _CheckInit
*
*/
static void  _CheckInit(void) {
  if (_IsInited == 0) {
    timeBeginPeriod(1);
    _IsInited = 1;
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/

/*********************************************************************
*
*       FS_X_OS_Lock
*
*/
void FS_X_OS_Lock(unsigned LockIndex) {
  HANDLE hSema;
  LOCK_INST * pInst;

  pInst = (_paInst + LockIndex);
  hSema = pInst->hSema;
  if (hSema == NULL) {
    return;
  }
  pInst->OpenCnt++;
//  FS_X_Logf("Locking:   Index: 0x%.8x, Name: %s\n", LockIndex, pInst->acName);
  WaitForSingleObject(hSema, INFINITE);
}

/*********************************************************************
*
*       FS_X_OS_Unlock
*
*/
void FS_X_OS_Unlock(unsigned LockIndex) {
  HANDLE hSema;
  LOCK_INST * pInst;

  pInst = (_paInst + LockIndex);
  hSema = pInst->hSema;
  if (hSema == NULL) {
    return;
  }
//  FS_X_Logf("Unlocking: Index: 0x%.8x, Name: %s\n", LockIndex, pInst->acName);
  ReleaseSemaphore(hSema, 1, NULL);
  pInst->OpenCnt--;
}

/*********************************************************************
*
*       FS_X_OS_Init
*
*  Description:
*    Initializes the OS resources. Specifically, you will need to
*    create FS_NUM_LOCKS binary semaphores/mutexs. This function is
*    called by FS_Init(). You should create all resources required
*    by the OS to support multithreading of the file system.
*
*  Parameters:
*    None.
*
*  Return value:
*    0    - on success
*    -1   - on failure.
*/
void FS_X_OS_Init(unsigned NumLocks) {
  unsigned i;
  LOCK_INST * pInst;

  _paInst = FS_AllocZeroed(NumLocks * sizeof(LOCK_INST));
  pInst    = &_paInst[0];
  for (i = 0; i < NumLocks; i++) {
    sprintf(pInst->acName, "Filesystem Semaphore %.3d", i);
    pInst->hSema = CreateSemaphore(NULL, 1, 1, pInst->acName);
    if (pInst->hSema == NULL) {
      FS_DEBUG_ERROROUT("FS_X_OS_Init: Could not create semaphore.");
      return;
    }
    pInst++;

  }
}

/*********************************************************************
*
*       FS_X_OS_Delay
*
*/
void FS_X_OS_Delay  (int ms) {
  _CheckInit();
  Sleep(ms);
}

/*********************************************************************
*
*       FS_X_OS_GetTime
*
*/
U32  FS_X_OS_GetTime(void) {
  _CheckInit();
  return timeGetTime();
}


/*************************** End of file ****************************/