SHM_Transporter.unix.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
源码类别:
MySQL数据库
开发平台:
Visual C++
- /* 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 "SHM_Transporter.hpp"
- #include "TransporterInternalDefinitions.hpp"
- #include <TransporterCallback.hpp>
- #include <NdbSleep.h>
- #include <NdbOut.hpp>
- #include <sys/ipc.h>
- #include <sys/shm.h>
- bool
- SHM_Transporter::ndb_shm_create()
- {
- shmId = shmget(shmKey, shmSize, IPC_CREAT | 960);
- if(shmId == -1) {
- perror("shmget: ");
- return false;
- }
- return true;
- }
- bool
- SHM_Transporter::ndb_shm_get()
- {
- shmId = shmget(shmKey, shmSize, 0);
- if(shmId == -1) {
- perror("shmget: ");
- return false;
- }
- return true;
- }
- bool
- SHM_Transporter::ndb_shm_attach()
- {
- shmBuf = (char *)shmat(shmId, 0, 0);
- if(shmBuf == 0) {
- perror("shmat: ");
- return false;
- }
- return true;
- }
- bool
- SHM_Transporter::checkConnected(){
- struct shmid_ds info;
- const int res = shmctl(shmId, IPC_STAT, &info);
- if(res == -1){
- report_error(TE_SHM_IPC_STAT);
- return false;
- }
- if(info.shm_nattch != 2){
- report_error(TE_SHM_DISCONNECT);
- return false;
- }
- return true;
- }
- void
- SHM_Transporter::disconnectImpl(){
- if(_attached){
- const int res = shmdt(shmBuf);
- if(res == -1){
- perror("shmdelete: ");
- return;
- }
- _attached = false;
- if(!isServer && _shmSegCreated)
- _shmSegCreated = false;
- }
- if(isServer && _shmSegCreated){
- const int res = shmctl(shmId, IPC_RMID, 0);
- if(res == -1){
- report_error(TE_SHM_UNABLE_TO_REMOVE_SEGMENT);
- return;
- }
- _shmSegCreated = false;
- }
- setupBuffersDone=false;
- }