Flock( resource $handle, int $operation, int &$wouldblock ): boolflock allows you to perform a simple reader/writermodel which can be used on virtually every platform (including most Unixderivatives and even Windows).On versions of PHP before 5.3.2, the lock is released also by(which is also called automatically when scriptfinished).PHP supports a portable way of locking complete files in an advisory way(which means all accessing programs have to use the same way of lockingor it will not work). By default, this function will block until therequested lock is acquired; this may be controlled with the LOCKNB option documented below. NotesNote:flock uses mandatory locking instead of advisorylocking on Windows. Mandatory locking is also supported on Linux andSystem V based operating systems via the usual mechanism supported by thefcntl system call: that is, if the file in question has the setgidpermission bit set and the group execution bit cleared. On Linux, the filesystem will also need to be mounted with the mand option for this to work.Note:Because flock requires a file pointer, you may haveto use a special lock file to protect access to a file that you intendto truncate by opening it in write mode (with a 'w' or 'w+' argument to).Note:May only be used on file pointers returned byfor local files, or file pointers pointing to userspace streams thatimplement the method.
The supplied documentation is vague, ambiguous and lacking, and the user comments contain erroneous information! The flock function follows the semantics of the Unix system call bearing the same name. Flock utilizes ADVISORY locking only; that is, other processes may ignore the lock completely; it only affects those that call the flock call.LOCKSH means SHARED LOCK. Any number of processes MAY HAVE A SHARED LOCK simultaneously. It is commonly called a reader lock.LOCKEX means EXCLUSIVE LOCK. Only a single process may possess an exclusive lock to a given file at a time.If the file has been LOCKED with LOCKSH in another process, flock with LOCKSH will SUCCEED. Flock with LOCKEX will BLOCK UNTIL ALL READER LOCKS HAVE BEEN RELEASED.If the file has been locked with LOCKEX in another process, the CALL WILL BLOCK UNTIL ALL OTHER LOCKS have been released.If however, you call flock on a file on which you possess the lock, it will try to change it.
So: flock(LOCKEX) followed by flock(LOCKSH) will get you a SHARED lock, not 'read-write' lock. When a file is closed the lock will be released by the system anyway, even if PHP doesn't do it explicitly anymore since 5.3.2 (the documentation is very confusing about this).However, I had a situation on an apache/PHP server where an out-of-memory error in PHP caused file handles to not be closed and therefore the locks where kept even thought PHP execution had ended and the process had returned to apache to serve other requests. The lock was kept alive until apache recycled those processes.This lack of proper clean up basically makes flock completely unreliable. I've been having trouble getting Flock to work when I read a file, delete it, and then output slightly changed information back to the same location.
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When deleting with Unlink, there's a very brief period of time where no file exists. But, if you do an fopen using the 'w' mode, it keeps the file in existence, but deletes all of its data when you go to write to it. That way, the file never actually disappears, and another script accessing the same file with flock won't get a 'file doesn't exist' error. Indeed, flock will not work reliably when the underlying filesystem is NFS.
![File File](https://www.isunshare.com/images/article/rar-password/how-to-lock-and-unlock-password-protected-rar-files/recover-locked-rar-file-password-successfully.png)
The proper way to perform file locking, in this case, would be to use PHP's link function. From the Linux man page of open:OEXCL When used with OCREAT, if the file already exists it is anerror and the open will fail.
How To Unlock Locked Files
In this context, a symbolic linkexists, regardless of where its points to. OEXCL is broken onNFS file systems, programs which rely on it for performing lock-ing tasks will contain a race condition.
The solution for per-forming atomic file locking using a lockfile is to create aunique file on the same fs (e.g., incorporating hostname andpid), use link(2) to make a link to the lockfile. If linkreturns 0, the lock is successful. Otherwise, use stat(2) onthe unique file to check if its link count has increased to 2,in which case the lock is also successful. Regarding the change in PHP 5.3.2 with locked files:Without having studied the PHP source code in detail, the situation appears to be as follows when the PHP function fclose is called:Before 5.3.2 PHP would check if the file was locked, then release the lock, and then close the file.From 5.3.2 PHP just closes the file.But note, that the operating system releases the lock automatically when the file is closed. Therefore a call to fclose STILL releases the lock (this is tested with PHP 5.3.2, Linux, x64). Besides from what the manual says about locking a file opendend in w or w+ and using a special lock file for these cases, you should simply truncate the file yourself with ftruncate after writing:now the file will have the size of $data without opening the file in w mode but with a lock on the file.to the previous writers jpriebe and mallory:of course the lock is lost in this case, but thats simply because the file is closed by PHP.
And closing the file means unlocking it (same as when you use fclose yourself). Just wanted to say that you will most likely fail if you use a separate lock file together with registershutdownfunction.my script did some different actions. Resizing pictures, rotating them and this stuff. It needed a 'database' file to get the correct file locations. This database file also stored some flags.
And of course the script had to save that file when it was done.because of my script exited on many different points depending on the action i used registershutdownfunction to save the file. It wanted to use a locking system to be sure the script doesn't overwrite the data another process had written into it some microseconds before. I was running on windows 2000 and apache2 on my developing machine, and flock always returned true for some reason.
So i used a separate lock file. The script looked for it at the beginning and exited if it was found. Otherwise it created it. But this file had to be deleted at the end. I put the unlink command into the registered shutdown-function but it never deleted the file. I tried clearstatcache and some other stuff but it didn't help.maybe this helps someone.
I'm thinking that a good way to ensure that no data is lost would be to create a buffer directory that could store the instructions for what is to be written to a file, then whenever the file is decidedly unlocked, a single execution could loop through every file in that directory and apply the indicated changes to the file.I'm working on writing this for a flat-file based database. The way it works is, whenever a command is issued (addline, removeline, editline), the command is stored in a flat file stored in a folder named a shortened version of the filename to be edited and named by the time and a random number. In that file is a standardized set of commands that define what is to be done to what file (the likes of 'file: SecuraLog/indexuid' new line 'editline: 14').Each execution will check every folder in that directory for files and a certain amount of time (I don't know how long, maybe 1-2 seconds) is spent making pending changes to unlocked files. This way no changes will be lost (i.e. Person 1 makes a change at the same time as person 2, and person 1 loses the race by just enough to have their changed version of the file overwritten by person 2's version) and there will be no problems with opening an empty open file.
Excel for iPad Word for iPad PowerPoint for iPad Excel for iPhone Word for iPhone PowerPoint for iPhone Word for Android tablets Excel for Android tablets PowerPoint for Android tablets Excel for Android phones Excel Mobile PowerPoint for Android phones PowerPoint Mobile Word for Android phones Word MobileWhen you try to open a Excel workbook, PowerPoint presentation, or Word document on your mobile device, you might receive a message stating that the file is locked for editing by another user. Typically, you will be able to open the file as read-only, but you won’t be able to edit it.The file might be locked because:.The file is shared and another user is currently editing it.An instance of the Office app is running in the background with the file already opened.The file has been marked as Final and can no longer be updated.In some situations, you can use your mobile device to unlock the file and continue editing it. Note: If the Office file is password-protected, you won’t be able to open it without supplying the password. There is no way to circumvent password protection. Another user is editing the fileIf someone is currently working on the file, you can either wait for that person to close it, or you can create a copy of the file and enter your changes in the copy.
(Alternatively, you could switch to an app that allows multiple authors to work on a file simultaneously.)Use the following procedures to create a copy on your mobile device. If you choose to enter your changes in a copy, it’s a good idea to use tracked changes so that you can easily move your changes to the shared file when it becomes available. You can turn on tracked changes on the Review tab. Tip: If you're trying to edit an Excel file at the same time as someone else, make sure that everyone uses a version of Excel that. The Office app is running in the backgroundIf the file is not shared on a network or if you are certain that no one is currently editing it, then an instance of the Office app with the file open might be running in the background. The file is marked as FinalOffice includes a file protection feature that allows authors to mark a file as Final. This locks the file, preventing any further editing.
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You can easily turn off this feature in the Office applications; however, you can’t turn it off from your mobile device. If an Office file is marked Final, you will need to make a copy to enter your changes from your mobile device.
Double-tap the Home button, touch the app, and then swipe up. This will close the app and any running processes associated with it.If for some reason the app is unresponsive and can’t be closed, you can force it to close.Hold down the power button.When the slide to power off screen appears, release the power button.Press the Home button until the app quits. (It will quit after a few seconds.).Double-tap the Home button. If the app still appears to be open, touch the app icon, and then swipe up. Open the multitasking screen, touch the Office app, and then swipe to the left or right.
This will close the app and any running processes associated with it.If for some reason the app is unresponsive and can’t be closed, you can close it from the Settings app.Tap the Settings app to open it.Tap Apps.In the upper-right corner, tap Running.Tap the app.Scroll down and tap Force Stop or Stop.You will see a confirmation message. Tap OK.Open the multitasking screen.
Full Specifications What's new in version 6.1This version is the first release on CNET Download.com.GeneralPublisherPublisher web siteRelease DateAugust 25, 2007Date AddedAugust 25, 2007Version6.1CategoryCategorySubcategoryOperating SystemsOperating SystemsWindows XP/VistaAdditional RequirementsWindows XP/2003 Server/VistaDownload InformationFile Size1.14GBFile NameExternal FilePopularityTotal Downloads9,792Downloads Last Week4PricingLicense ModelFreeLimitationsNot availablePriceFree. Install windows sdk 6.0a.
If the Office app still appears, touch the app icon, and then swipe to the left or right to close it.
They have taken that functionality away!You can set the item linked to the file back to WIP which will unlock the file or if you have admin rights you can change the file properties to allow a specified person group to open the file, The 'locking' is actually denying you write permissions.select the file, choose Properties in the file drop down menu, select the 'security' tab, then tick the override security. You can then select people or groups from the drop down list, add them to the list, then you can choose to allow or deny the read / write / delete permissions.
Easy!!!!!!!Of course you may then need to reverse the above.Of course having made a change to the file it will no longer be in synch with the item master - so putting the item back to WIP is usually safer. I tried the security route. I wanted to lock down a project file, so as the administrator I went to propertiessecurity and overrode the security allowing only administrators the ability to modify or delete the file. All others could only read.So I tested it. The first thing I did as a normal, non-admin user was to try to change the state of the file (btw.the file showed a lock icon as if it were locked). Yep, I could change the state. What happend to the security override???
Unlock Files Windows
I changed the state back and then the file became unlocked. So I went back into the client as an administrator and saw that the security was no longer overridden. So, thinking maybe I messed up.I tried it again, with the same result.WHHHHHHYYYYYY! Why did Autodesk remove a feature that was so convenient before????
Unlock A File Folder
Off to create a separate lifecycle just to handle locked files. The Change State command always has to be available for both locked and unlocked files. Otherwise you could lock a file by putting it in released state and never get it out of that released state.After some planning, the security can be configured appropriately so that only the right people can make those modifications to the file. For example, you can configure the lifecycle definition to only allow certain people the right to make certain state changes or to have access to files in certain states.
![File File](https://img.raymond.cc/blog/wp-content/uploads/2012/12/lockhunter.png)
I suggest looking at the transition security on your system.The system is very configurable and can be a very powerful tool.As for document and item lifecycles being used together, it certainly can be done, but many users choose to drive the security through one system. For example, you can drive lifecycle states and security through the document lifecycles but still use Items for BOM data, ERP integrations, etc.Regards,Adam. Adam, I appreciate your response.Locked should mean locked, regardless of state changes. No change is allowed.not even a state change. The administrator can apply the lock and remove the lock. If the administrator applys the lock, then the ramifications of such lock would be realized when it comes to state changes.Security has been properly configured through transisitions.
I only want an administrator to be able to modify a locked file. Some users (the advanced group) are allowed to change state (example: from Released to WIP). But even these need to be prevented from changing some files like the ONE project file that everyone's projects hinge on. I can't risk this being modified (even by myself).I filed a support ticket with Autodesk Subscription. This was the technical question, 'You've removed lock file capabilities from vault (that existed previous to 2010), now what?'
The support representative was very friendly, but pointed me to the forums because 'this is not a technical issue'. There is NO formal documentation from Autodesk anywhere on this!While talking with him, I had an idea. Instead of creating a separate lifecycle altogether and having to worry about recategorizing or reassigning files to a different lifecycle, Why don't I just create a separate state in the lifecycle called 'Locked' and only allow Administrators to transition in and out of that state. Sounds easy.I'm going to try it.Why couldn't this have been documented as an 'alternative way' of locking files? Locking files by transitioning to a 'Locked' state works great!
I've assigned the Administrator group as the only ones allowed to transition in and out.I'm considering creating another stated call 'Locked and Released' as an extra tool for administrators who want to lock a released file but keep it in a released state so other parent files can be released. (the locked state would be a 'released state') This will be necessary if you mandate that children be released before their parents. I haven't tried it yet, but it seems like it should work.Honestly though, it's nice to have these tools available to the administrator, but right now I can see a time we would use them. The whole driving factor for all of this was so I could do one thing.lock the project file. That's all.I hope someone finds this useful.