rt-thread/filesystem/dfs/filesystems/elmfat/option/syncobj.c

/*------------------------------------------------------------------------*/
/* Sample code of OS dependent synchronization object controls            */
/* for FatFs R0.07a  (C)ChaN, 2009                                        */
/*------------------------------------------------------------------------*/

#include <windows.h>	// Win32
//#include <ucos_ii.h>	// uC/OS-II

#include "../ff.h"

#if _FS_REENTRANT

/*------------------------------------------------------------------------*/
/* Create a Synchronization Object for a Volume
/*------------------------------------------------------------------------*/
/* This function is called in f_mount function to create a new
/  synchronization object, such as semaphore and mutex. When a FALSE is
/  returned, the f_mount function fails with FR_INT_ERR.
*/

BOOL ff_cre_syncobj (	/* TRUE:Function succeeded, FALSE:Could not create due to any error */
	BYTE vol,			/* Corresponding logical drive being processed */
	_SYNC_t *sobj		/* Pointer to return the created sync object */
)
{
	BOOL ret;

	*sobj = CreateMutex(NULL, FALSE, NULL);					// Win32
	ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE;	//

//	*sobj = VolumeSemId[vol];	// uITRON (give a static created sync object)
//	ret = TRUE;					// The initial value of the semaphore must be 1.

//	*sobj = OSMutexCreate(0, &err);				// uC/OS-II
//	ret = (err == OS_NO_ERR) ? TRUE : FALSE;	//

	return ret;
}



/*------------------------------------------------------------------------*/
/* Delete a Synchronization Object                                        */
/*------------------------------------------------------------------------*/
/* This function is called in f_mount function to delete a synchronization
/  object that created with ff_cre_syncobj function. When a FALSE is
/  returned, the f_mount function fails with FR_INT_ERR.
*/

BOOL ff_del_syncobj (	/* TRUE:Function succeeded, FALSE:Could not delete due to any error */
	_SYNC_t sobj		/* Sync object tied to the logical drive to be deleted */
)
{
	BOOL ret;

	ret = CloseHandle(sobj);	// Win32

//	ret = TRUE;					// uITRON (nothing to do)

//	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);		// uC/OS-II
//	ret = (err == OS_NO_ERR) ? TRUE : FALSE;	//

	return ret;
}



/*------------------------------------------------------------------------*/
/* Request Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on entering file functions to lock the volume.
/  When a FALSE is returned, the file function fails with FR_TIMEOUT.
*/

BOOL ff_req_grant (	/* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
	_SYNC_t sobj	/* Sync object to wait */
)
{
	BOOL ret;

	ret = (WaitForSingleObject(sobj, _TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE;	// Win32

//	ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE;	// uITRON

//	OSMutexPend(sobj, _TIMEOUT, &err));				// uC/OS-II
//	ret = (err == OS_NO_ERR) ? TRUE : FALSE;		//

	return ret;
}



/*------------------------------------------------------------------------*/
/* Release Grant to Access the Volume                                     */
/*------------------------------------------------------------------------*/
/* This function is called on leaving file functions to unlock the volume.
*/

void ff_rel_grant (
	_SYNC_t sobj	/* Sync object to be signaled */
)
{
	ReleaseMutex(sobj);	// Win32

//	sig_sem(sobj);		// uITRON

//	OSMutexPost(sobj);	// uC/OS-II
}


#else

#error This file is not needed in this configuration.

#endif