GUIDEV_Usage.c
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上传日期:2017-08-10
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- /*
- *********************************************************************************************************
- * uC/GUI
- * Universal graphic software for embedded applications
- *
- * (c) Copyright 2002, Micrium Inc., Weston, FL
- * (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
- *
- * 礐/GUI is protected by international copyright laws. Knowledge of the
- * source code may not be used to write a similar product. This file may
- * only be used in accordance with a license and should not be redistributed
- * in any way. We appreciate your understanding and fairness.
- *
- ----------------------------------------------------------------------
- File : GUIDev.C
- Purpose : Implementation of memory devices
- ---------------------------END-OF-HEADER------------------------------
- */
- #include <string.h>
- #include "GUI_Protected.h"
- #include "GUIDebug.h"
- /* Memory device capabilities are compiled only if support for them is enabled.*/
- #if GUI_SUPPORT_MEMDEV
- /*
- *****************************************************************
- *
- * GUI_USAGE_Select
- *
- *****************************************************************
- Purpose:
- Selects a usage object into the active memory device.
- */
- void GUI_USAGE_Select(GUI_USAGE_Handle hUsage) {
- GUI_MEMDEV * pDev;
- GUI_LOCK();
- pDev = GUI_MEMDEV_h2p(GUI_Context.hDevData);
- pDev->hUsage = hUsage;
- GUI_UNLOCK();
- }
- /************************************************
- *
- * DecUseCnt
- *
- *************************************************
- Purpose: Decrements the usage count and deletes the usage object if
- the counter reaches 0.
- */
- void GUI_USAGE_DecUseCnt(GUI_USAGE_Handle hUsage) {
- GUI_USAGE* pThis;
- GUI_LOCK();
- pThis = GUI_USAGE_h2p(hUsage);
- if (--pThis->UseCnt == 0) {
- GUI_ALLOC_FREE(hUsage);
- }
- GUI_UNLOCK();
- }
- #else
- void GUIDEV_Usage(void) {} /* avoid empty object files */
- #endif /* GUI_SUPPORT_MEMDEV */