bool FSLock::obtain()
{
if ( !Misc::dir_Exists(lockDir) ){
if ( _mkdir(lockDir) == -1 ){
char* err = _CL_NEWARRAY(char,34+strlen(lockDir)+1); //34: len of "Couldn't create lock directory: "
strcpy(err,"Couldn't create lock directory: ");
strcat(err,lockDir);
_CLTHROWA_DEL(CL_ERR_IO, err );
}
}
MMapIndexInput::MMapIndexInput(const char* path):
_internal(_CLNEW Internal)
{
//Func - Constructor.
// Opens the file named path
//Pre - path != NULL
//Post - if the file could not be opened an exception is thrown.
CND_PRECONDITION(path != NULL, "path is NULL");
#if defined(_CL_HAVE_FUNCTION_MAPVIEWOFFILE)
_internal->mmaphandle = NULL;
_internal->fhandle = CreateFileA(path,GENERIC_READ,FILE_SHARE_READ, 0,OPEN_EXISTING,0,0);
//Check if a valid fhandle was retrieved
if (_internal->fhandle < 0){
_cl_dword_t err = GetLastError();
if ( err == ERROR_FILE_NOT_FOUND )
_CLTHROWA(CL_ERR_IO, "File does not exist");
else if ( err == ERROR_ACCESS_DENIED )
_CLTHROWA(ERROR_ACCESS_DENIED, "File Access denied");
else if ( err == ERROR_TOO_MANY_OPEN_FILES )
_CLTHROWA(CL_ERR_IO, "Too many open files");
else
_CLTHROWA(CL_ERR_IO, "File IO Error");
}
_cl_dword_t dummy=0;
_internal->_length = GetFileSize(_internal->fhandle, &dummy);
if ( _internal->_length > 0 ){
_internal->mmaphandle = CreateFileMappingA(_internal->fhandle,NULL,PAGE_READONLY,0,0,NULL);
if ( _internal->mmaphandle != NULL ){
void* address = MapViewOfFile(_internal->mmaphandle,FILE_MAP_READ,0,0,0);
if ( address != NULL ){
_internal->data = (uint8_t*)address;
return; //SUCCESS!
}
}
//failure:
int errnum = GetLastError();
CloseHandle(_internal->mmaphandle);
char* lpMsgBuf=strerror(errnum);
size_t len = strlen(lpMsgBuf)+80;
char* errstr = _CL_NEWARRAY(char, len);
cl_sprintf(errstr, "MMapIndexInput::MMapIndexInput failed with error %d: %s", len, errnum, lpMsgBuf);
_CLTHROWA_DEL(CL_ERR_IO,errstr);
}
