Helper class for locking a file. More...

#include <FileSystem.h>

Public Member Functions
	Lock (const std::string &fileName, bool readonly=false)
	Construct a Lock object for the given file. More...

	~Lock ()
	Destructor. More...

bool	lock (int timeout=300, bool ignoreErrors=false)
	Try to lock the file. More...

Private Attributes
int	m_file
	File descriptor of file to be locked.

bool	m_readOnly
	if this is a read-only lock (multiple processes can hold one).

Detailed Description

Helper class for locking a file.

Definition at line 97 of file FileSystem.h.

Constructor & Destructor Documentation

explicit

Construct a Lock object for the given file.

Parameters

fileName	Name of the file to be locked (if it does not exist, it will be created)
readonly	create a read-only lock (multiple processes can hold one)

Definition at line 174 of file FileSystem.cc.

~Lock ( )

Destructor.

Releases the lock

Definition at line 181 of file FileSystem.cc.

Try to lock the file.

Note: Locks are not exclusive inside the same process, i.e. lock() will succeed even if a lock is already held by the current process.

Parameters

timeout	Time in seconds to wait for a lock (default is rather high to deal with slow FS at KEKCC)
ignoreErrors	if true just return if locking was unsuccessful but don't print an error

Returns: True if the lock could be obtained, false if file could not be opened or timeout is reached

Definition at line 186 of file FileSystem.cc.

The documentation for this class was generated from the following files: