I have read php's manual page on the 'file_get_contents' function which does not state anything about how 'file_get_contents` behaves with respect to php's file locking. However in the comment sect...

My use case is as follows: I have a program that enforces that only one instance of it can be running at any given time, so at startup it always tries to grab hold of a lock file in a standard loca...

I am having trouble figuring out why flock() is not behaving properly in the following scenario. The following code is placed into two different PHP scripts one "test1.php" and the other "test2.ph...

I have cron job to run node.js scripts. Want to use flock to lock a file to make sure my cron jobs are not overlapped. Any good module for doing file locking ? Or I should call that in child pro...

In C programming, is there a way to achieve timeout on flock()? Thanks. #include <sys/file.h> int flock(int fd, int operation);

Will flock or lockf work on a directory? I there another way to lock a directory in C on a linux machine?

I wrote a simple go application and added a flock system to prevent being running twice at the same time: import "github.com/nightlyone/lockfile" lock, err := lockfile.New(filepath.Join(os.TempDi...

In PHP, how can I test if a file has already been locked with flock? For example, if another running script has called the following: $fp = fopen('thefile.txt', 'w'); flock($fp, LOCK_EX);

Greetings all. I'm setting up a cron job to execute a bash script, and I'm worried that the next one may start before the previous one ends. A little googling reveals that a popular way to address ...

I am using bash and flock on centos. Normally I would run cd /to/my/dir && python3.6 runcommand.py But then we add it to cron and don't want output so add > /dev/null 2>&1 And...

Is there a flock command on Mac OS X that manages file lock? http://linux.die.net/man/1/flock

I am looking at the flock docs: http://www.tutorialspoint.com/unix_system_calls/flock.htm https://linux.die.net/man/1/flock I have this: #!/usr/bin/env bash temp_dir="$HOME/temperton/tmp...

PHP's documentation page for flock() indicates that it's not safe to use under IIS. If I can't rely on flock under all circumstances, is there another way I could safely achieve the same thing?

What ways are there available, for exclusively opening a device file (say, the display frame buffer)? [Info: I already know about flock() & friends, which have an effect only when the other app...

context I'm slowly writing a specialized web server application in C++ (using the C onion http server library and the JSONCPP library for JSON serialization, if that matters)., for a Linux system ...

I'm studing the flock mecanism in PHP and I'm having a hard time understanding the functionality of the LOCK_SH mode. I read on a site that it locks the file so that other scripts cannot WRITE in i...

I'm using flock() for inter-process named mutexes (i.e. some process can decide to hold a lock on "some_name", which is implemented by locking a file named "some_name" in a temp directory: lockfil...

Scenario: I have many processes running that need to fetch files over the net. If the file is already downloaded, I want it cached on disk. If another process is downloading the file, block until i...

I have a website where at the same moment, there can be multiple users writing to the same file at the same time. An example of my code is below. PHP 5.6.20 <?php $root=realpath($_SERVER["DOCU...

flock() is PHP's portable advisory file locking function. They explicitly promote that it even works under windows: flock() allows you to perform a simple reader/writer model which can be used o...

What is the simplest/best way to ensure only one instance of a given script is running - assuming it's Bash on Linux? At the moment I'm doing: ps -C script.name.sh > /dev/null 2>&...

I want to get output from two processes and merge them into one file, like: proc1 >> output & proc2 >> output & The problem is that output may be mixed up in the final file. Fo...

I have read enough posts on stackoverflow regarding the difference between flock/lockf/fcntl but I am unable to answer the below observation: >>> import fcntl >>> a = open('/tmp/l...

Flock is a reasonably new iOS app from the guys at Bump, which has an interesting feature. It somehow knows when photos have been taken by another app, notifies the user (in a notification center w...

I need to run a python script (job.py) every minute. This script must not be started if it is already running. Its execution time can be between 10 seconds and several hours. So I put into my cron...