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MySQL 5.1: mysql/src/5.1-dbg/storage/ndb/src/common/portlib/NdbMutex.c Source File
mysql/src/5.1-dbg/storage/ndb/src/common/portlib/NdbMutex.c

00001 /* Copyright (C) 2003 MySQL AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; either version 2 of the License, or
00006    (at your option) any later version.
00007 
00008    This program is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011    GNU General Public License for more details.
00012 
00013    You should have received a copy of the GNU General Public License
00014    along with this program; if not, write to the Free Software
00015    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
00016 
00017 
00018 #include <ndb_global.h>
00019 
00020 #include <NdbThread.h>
00021 #include <NdbMutex.h>
00022 #include <NdbMem.h>
00023 
00024 NdbMutex* NdbMutex_Create(void)
00025 {
00026   NdbMutex* pNdbMutex;
00027   int result;
00028   DBUG_ENTER("NdbMutex_Create");
00029   
00030   pNdbMutex = (NdbMutex*)NdbMem_Allocate(sizeof(NdbMutex));
00031   DBUG_PRINT("info",("NdbMem_Allocate 0x%lx",pNdbMutex));
00032   
00033   if (pNdbMutex == NULL)
00034     DBUG_RETURN(NULL);
00035   
00036   result = pthread_mutex_init(pNdbMutex, NULL);
00037   assert(result == 0);
00038                              
00039   DBUG_RETURN(pNdbMutex);                    
00040 }
00041 
00042 
00043 int NdbMutex_Destroy(NdbMutex* p_mutex)
00044 {
00045   int result;
00046   DBUG_ENTER("NdbMutex_Destroy");
00047 
00048   if (p_mutex == NULL)
00049     DBUG_RETURN(-1);
00050 
00051   result = pthread_mutex_destroy(p_mutex);
00052 
00053   DBUG_PRINT("info",("NdbMem_Free 0x%lx",p_mutex));
00054   NdbMem_Free(p_mutex);
00055                              
00056   DBUG_RETURN(result);
00057 
00058 }
00059 
00060 
00061 int NdbMutex_Lock(NdbMutex* p_mutex)
00062 {
00063   int result;
00064 
00065   if (p_mutex == NULL)
00066     return -1;
00067 
00068   result = pthread_mutex_lock(p_mutex);
00069   
00070   return result;
00071 }
00072 
00073 
00074 int NdbMutex_Unlock(NdbMutex* p_mutex)
00075 {
00076   int result;
00077 
00078   if (p_mutex == NULL)
00079     return -1;
00080 
00081   result = pthread_mutex_unlock(p_mutex);
00082                              
00083   return result;
00084 }
00085 
00086 
00087 int NdbMutex_Trylock(NdbMutex* p_mutex)
00088 {
00089   int result = -1;
00090 
00091   if (p_mutex != NULL) {
00092     result = pthread_mutex_trylock(p_mutex);
00093   }
00094 
00095   return result;
00096 }
00097
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