116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
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/*------------------------------------------------------------------------*/
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/* Sample code of OS dependent synchronization object controls */
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/* for FatFs R0.07a (C)ChaN, 2009 */
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/*------------------------------------------------------------------------*/
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#include <windows.h> // Win32
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//#include <ucos_ii.h> // uC/OS-II
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#include "../ff.h"
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#if _FS_REENTRANT
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/*------------------------------------------------------------------------*/
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/* Create a Synchronization Object for a Volume
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount function to create a new
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/ synchronization object, such as semaphore and mutex. When a FALSE is
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/ returned, the f_mount function fails with FR_INT_ERR.
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*/
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BOOL ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */
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BYTE vol, /* Corresponding logical drive being processed */
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_SYNC_t *sobj /* Pointer to return the created sync object */
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)
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{
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BOOL ret;
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*sobj = CreateMutex(NULL, FALSE, NULL); // Win32
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ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE; //
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// *sobj = VolumeSemId[vol]; // uITRON (give a static created sync object)
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// ret = TRUE; // The initial value of the semaphore must be 1.
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// *sobj = OSMutexCreate(0, &err); // uC/OS-II
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// ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Delete a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount function to delete a synchronization
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/ object that created with ff_cre_syncobj function. When a FALSE is
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/ returned, the f_mount function fails with FR_INT_ERR.
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*/
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BOOL ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */
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_SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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)
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{
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BOOL ret;
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ret = CloseHandle(sobj); // Win32
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// ret = TRUE; // uITRON (nothing to do)
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// OSMutexDel(sobj, OS_DEL_ALWAYS, &err); // uC/OS-II
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// ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Request Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on entering file functions to lock the volume.
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/ When a FALSE is returned, the file function fails with FR_TIMEOUT.
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*/
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BOOL ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
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_SYNC_t sobj /* Sync object to wait */
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)
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{
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BOOL ret;
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ret = (WaitForSingleObject(sobj, _TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE; // Win32
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// ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE; // uITRON
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// OSMutexPend(sobj, _TIMEOUT, &err)); // uC/OS-II
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// ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Release Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on leaving file functions to unlock the volume.
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*/
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void ff_rel_grant (
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_SYNC_t sobj /* Sync object to be signaled */
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)
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{
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ReleaseMutex(sobj); // Win32
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// sig_sem(sobj); // uITRON
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// OSMutexPost(sobj); // uC/OS-II
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}
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#else
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#error This file is not needed in this configuration.
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#endif
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