NdbMutex.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:1k
- /* 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 "NdbMutex.h"
- #include <pthread.h>
- #include <stdlib.h>
- NdbMutex* NdbMutex_Create(void)
- {
- NdbMutex* pNdbMutex;
- pNdbMutex = create_sem(1);
-
- return pNdbMutex;
- }
- int NdbMutex_Destroy(NdbMutex* p_mutex)
- {
- if (p_mutex == NULL)
- return -1;
-
- kill_sem(p_mutex);
-
- return 0;
- }
- int NdbMutex_Lock(NdbMutex* p_mutex)
- {
- if (p_mutex == NULL)
- return -1;
- wait_sem(p_mutex);
- return 0;
- }
- int NdbMutex_Unlock(NdbMutex* p_mutex)
- {
- if (p_mutex == NULL)
- return -1;
- signal_sem(p_mutex);
-
- return 0;
- }
- int NdbMutex_Trylock(NdbMutex* p_mutex)
- {
- int result = -1;
- if (p_mutex != NULL) {
- OSSEMVAL semvalue = get_sem(p_mutex);
- if (semvalue > 0) {
- wait_sem(p_mutex);
- result = 0;
- }
- }
- return result;
- }