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How to check for file lock?


By : Abhi
Date : July 27 2020, 08:00 AM
To fix the issue you can do No, unfortunately, and if you think about it, that information would be worthless anyway since the file could become locked the very next second (read: short timespan).
Why specifically do you need to know if the file is locked anyway? Knowing that might give us some other way of giving you good advice.
code :
if not locked then
    open and update file


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Check For File Lock Without A Try Catch


By : SimonZ
Date : March 29 2020, 07:55 AM
around this issue Just how often are you going to be doing this? To put it in context, suppose you check once every 50 milliseconds - which is pretty frequently. My laptop (last time I checked) was able to throw over 100 exceptions per millisecond... so the cost of throwing the exception would be less than 0.02% of the overall time - and that's assuming it's always busy!
Now, it would certainly be nice to have an API to avoid this - a sort of TryOpenFile - but in its absence, I'd just tuck it away in another function and not worry.

Is there an easy way to check who has a reader lock or a writer lock in Visual Studio 2010?


By : one fish
Date : March 29 2020, 07:55 AM
I wish this help you No, not easily at least.
You can use something like JetBrains dotTrace which will allow you to go into the bowels of the call stack to figure out where things are getting held up.

Check Scroll Lock, Num Lock & Caps Lock in JavaScript on Page Load


By : dafulq mafuq
Date : March 29 2020, 07:55 AM
Hope that helps No, you can't get system state from javascript. You will need them to type something and then analyze the input. Probably not what you wanted to hear =/

PHPStorm 7 & Subversion Check File lock before opening file


By : R Harris
Date : March 29 2020, 07:55 AM
I hope this helps you . No, doesn't work currently:( Please watch IDEA-49011 to be notified on any progress

flock(): is it possible to merely check if the file is already locked, without actually acquiring the lock if not?


By : user3330518
Date : March 29 2020, 07:55 AM
I wish this helpful for you You cannot do this reliably. Processes are asynchronous: when you fail to acquire the lock, there is no guarantee that the file will still be locked by the time you print the locked status. Similarly, if you manage to acquire the lock, You then immediately release it, so by the time you print the unlocked status, the file my have been locked by another process. If there are a lot of contenders trying to lock this file, the likelihood of the status message being out of sync is high. Attackers can take advantage of this kind of approximation to penetrate systems.
If you were to rely on this check in a script to perform any kind of concurrent work, all bets are off. If it is just producing an informative status, you should use the past tense in the status messages:
code :
if (flock(fileno(lockFile), LOCK_EX|LOCK_NB) == -1) {
    if (errno == EWOULDBLOCK) {
        printf("lock file was locked\n");
    } else {
        // error
    }
} else {
    flock(fileno(lockFile), LOCK_UN);
    printf("lock file was unlocked\n");
}
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