ShBlocks.cpp
上传用户:woshihumen
上传日期:2013-07-18
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文件大小:2k
- /*
- * XMail by Davide Libenzi ( Intranet and Internet mail server )
- * Copyright (C) 1999,..,2004 Davide Libenzi
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Davide Libenzi <davidel@xmailserver.org>
- *
- */
- #include "SysInclude.h"
- #include "SysDep.h"
- #include "SvrDefines.h"
- #include "ShBlocks.h"
- struct SharedBlock {
- unsigned int uSize;
- SYS_MUTEX hMutex;
- void *pData;
- };
- SHB_HANDLE ShbCreateBlock(unsigned int uSize)
- {
- SharedBlock *pSHB = (SharedBlock *) SysAlloc(sizeof(SharedBlock));
- if (pSHB == NULL)
- return (SHB_INVALID_HANDLE);
- ZeroData(*pSHB);
- pSHB->uSize = uSize;
- if ((pSHB->hMutex = SysCreateMutex()) == SYS_INVALID_MUTEX) {
- SysFree(pSHB);
- return (SHB_INVALID_HANDLE);
- }
- if ((pSHB->pData = SysAlloc(uSize)) == NULL) {
- SysCloseMutex(pSHB->hMutex);
- SysFree(pSHB);
- return (SHB_INVALID_HANDLE);
- }
- memset(pSHB->pData, 0, uSize);
- return ((SHB_HANDLE) pSHB);
- }
- int ShbCloseBlock(SHB_HANDLE hBlock)
- {
- SharedBlock *pSHB = (SharedBlock *) hBlock;
- SysCloseMutex(pSHB->hMutex);
- SysFree(pSHB->pData);
- SysFree(pSHB);
- return (0);
- }
- void *ShbLock(SHB_HANDLE hBlock)
- {
- SharedBlock *pSHB = (SharedBlock *) hBlock;
- if (SysLockMutex(pSHB->hMutex, SYS_INFINITE_TIMEOUT) < 0)
- return (NULL);
- return (pSHB->pData);
- }
- int ShbUnlock(SHB_HANDLE hBlock)
- {
- SharedBlock *pSHB = (SharedBlock *) hBlock;
- SysUnlockMutex(pSHB->hMutex);
- return (0);
- }