ndbmutex.c

来自「MySQL数据库开发源码 值得一看哦」· C语言 代码 · 共 74 行

/* Copyright (C) 2003 MySQL AB

   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 */


#include <ndb_global.h>
#include "NdbMutex.h"

NdbMutex* NdbMutex_Create(void)
{
    NdbMutex* pNdbMutex = (NdbMutex*)malloc(sizeof(NdbMutex));
    if(!pNdbMutex)
        return 0;
    
    InitializeCriticalSection(pNdbMutex);
    return pNdbMutex;
}


int NdbMutex_Destroy(NdbMutex* p_mutex)
{
    if(!p_mutex)
        return -1;
    
    DeleteCriticalSection(p_mutex);
    free(p_mutex);
    return 0;
}


int NdbMutex_Lock(NdbMutex* p_mutex)
{
    if(!p_mutex)
        return -1;
    
    EnterCriticalSection (p_mutex);
    return 0;
}


int NdbMutex_Unlock(NdbMutex* p_mutex)
{
    if(!p_mutex)
        return -1;
    
    LeaveCriticalSection(p_mutex);
    return 0;
}


int NdbMutex_Trylock(NdbMutex* p_mutex)
{
    int result = -1;
    if(p_mutex) 
    {
        result = NdbMutex_Lock(p_mutex);
	//(TryEnterCriticalSection(p_mutex) ? 0 : -1);
    }
    return result;
}