inline void remove_if_can_lock_file(const char *file_path)
{
file_handle_t fhnd = open_existing_file(file_path, read_write);
if(fhnd != invalid_file()){
bool acquired;
if(try_acquire_file_lock(fhnd, acquired) && acquired){
delete_file(file_path);
}
close_file(fhnd);
}
}
inline int try_open_and_lock_file(const char *name)
{
int fd = open_existing_file(name, read_write);
if(fd < 0){
return fd;
}
if(!try_lock_locking_file(fd)){
close(fd);
return -1;
}
return fd;
}
inline int try_open_and_lock_file(const char *name)
{
file_handle_t handle = open_existing_file(name, read_write);
int fd = _open_osfhandle((intptr_t)handle, _O_TEXT);
if(fd < 0){
close_file(handle);
return fd;
}
if(!try_lock_locking_file(fd)){
_close(fd);
return -1;
}
return fd;
}
inline bool file_wrapper::priv_open_or_create
(detail::create_enum_t type,
const char *filename,
mode_t mode)
{
m_filename = filename;
if(mode != read_only && mode != read_write){
error_info err(mode_error);
throw interprocess_exception(err);
}
//Open file existing native API to obtain the handle
switch(type){
case detail::DoOpen:
m_handle = open_existing_file(filename, mode);
break;
case detail::DoCreate:
m_handle = create_new_file(filename, mode);
break;
case detail::DoOpenOrCreate:
m_handle = create_or_open_file(filename, mode);
break;
default:
{
error_info err = other_error;
throw interprocess_exception(err);
}
}
//Check for error
if(m_handle == invalid_file()){
throw interprocess_exception(error_info(system_error_code()));
}
m_mode = mode;
return true;
}
inline bool robust_spin_mutex<Mutex>::is_owner_dead(boost::uint32_t own)
{
//If owner is an invalid id, then it's clear it's dead
if(own == (boost::uint32_t)get_invalid_process_id()){
return true;
}
//Obtain the lock filename of the owner field
std::string file;
this->owner_to_filename(own, file);
//Now the logic is to open and lock it
file_handle_t fhnd = open_existing_file(file.c_str(), read_write);
if(fhnd != invalid_file()){
//If we can open the file, lock it.
bool acquired;
if(try_acquire_file_lock(fhnd, acquired) && acquired){
//If locked, just delete the file
delete_file(file.c_str());
close_file(fhnd);
return true;
}
//If not locked, the owner is suppossed to be still alive
close_file(fhnd);
}
else{
//If the lock file does not exist then the owner is dead (a previous cleanup)
//function has deleted the file. If there is another reason, then this is
//an unrecoverable error
if(error_info(system_error_code()).get_error_code() == not_found_error){
return true;
}
}
return false;
}
