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/*
* 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);
}
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