bool JdbcUtil::attachMemory(void)
{
setError(NULL);
// If we have not accessed the memory, get it
// only if it has already been created.
if ((sharedMemoryId==-1) &&
!getMemory(false)) return false;
if (sharedMemory && !sharedMemory->active)
{
// We are attached to an old memory segment.
// Detach it so we can attach the new one.
if (!detachMemory()) return false;
}
if (sharedMemory==NULL)
{
// At this point we have an id to the memory, now we
// can attach it.
void *shm;
if ((shm = shmat(sharedMemoryId, NULL, 0)) == (void *) -1)
{
setPerror("Cannot attach shared memory");
return false;
}
sharedMemory = (struct JdbcUtilMemoryStruct *) shm;
}
return true;
}
bool JdbcUtil::removeMemory(void)
{
setError(NULL);
if (!getMemory(false))
{
// If not found, it does not exist
if (errorCode == ENOENT) return true;
return false;
}
// deactivate the old memory in case some still has it attached
if (attachMemory())
{
sharedMemory->active = false;
detachMemory();
}
// Remove the memory
if (shmctl(sharedMemoryId,IPC_RMID,NULL)==-1)
{
setPerror("Cannot remove shared memory");
return false;
}
sharedMemoryId = -1;
return true;
}
JdbcUtil::~JdbcUtil(void)
{
detachMemory();
}
/**
* @brief
*/
MemoryIOV1::~MemoryIOV1()
{
if ( mMemPtr )
detachMemory();
}
