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124 lines
2.9 KiB
124 lines
2.9 KiB
/*
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This file is part of the KDE libraries
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Copyright (c) 2004 Waldo Bastian <bastian@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef _KLOCTDEFILE_H_
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#define _KLOCTDEFILE_H_
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#include <tqstring.h>
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#include <tqdatetime.h>
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#include <ksharedptr.h>
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/**
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* The TDELockFile class provides NFS safe lockfiles.
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*
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* @author Waldo Bastian <bastian@kde.org>
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* @since 3.3
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*/
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class TDECORE_EXPORT TDELockFile : public TDEShared
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{
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public:
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typedef TDESharedPtr<TDELockFile> Ptr;
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TDELockFile(const TQString &file);
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/**
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* Destroys the object, releasing the lock if held
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**/
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~TDELockFile();
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/**
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* Possible return values of the lock function.
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*/
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enum LockResult {
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/**
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* Lock was acquired successfully
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*/
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LockOK = 0,
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/**
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* The lock could not be acquired because it is held by another process
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*/
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LockFail,
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/**
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* The lock could not be acquired due to an error
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*/
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LockError,
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/**
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* A stale lock has been detected
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*/
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LockStale
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};
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enum LockOptions {
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/**
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* Return immediately, do not wait for the lock to become available
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*/
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LockNoBlock = 1,
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/**
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* Automatically remove a lock when a lock is detected that is stale
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* for more than staleTime() seconds.
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*/
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LockForce = 2
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};
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/**
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* Attempt to acquire the lock
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*
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* @param options A set of @ref LockOptions OR'ed together.
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*/
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LockResult lock(int options=0);
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/**
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* Returns whether the lock is held or not
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*/
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bool isLocked() const;
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/**
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* Release the lock
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*/
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void unlock();
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/**
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* Return the time in seconds after which a lock is considered stale
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* The default is 30.
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*/
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int staleTime() const;
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/**
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* Set the time in seconds after which a lock is considered stale
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*/
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void setStaleTime(int _staleTime);
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/**
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* Returns the pid, hostname and appname of the process holding
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* the lock after the lock functon has returned with LockStale.
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* @returns false if the pid and hostname could not be determined
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*/
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bool getLockInfo(int &pid, TQString &hostname, TQString &appname);
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private:
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class TDELockFilePrivate;
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TDELockFilePrivate *d;
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};
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#endif
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