CODEWITHSUNDEEP
file-ioconcurrency
silvercover
silvercover

Reputation: 161

Concurrency in reading and writing files

I have a website and part of my website needs to read/write a plain text file on server. most of the time we have between 50 to 100 concurrent online users and their actions on our site result to read/write certain file in which that is a temporary place holder for some other pages.

So I want to know about concurrent read/write conflicts and what's the best practice to avoid that if that happened. How does my server manage these requests?

Upvotes: 0

Views: 398

Answers (2)

ninjalj
ninjalj

Reputation: 43748

An option in *nix systems is creating a temporary file, writing to it, fsync()ing it, and then rename()ing to the target filename. Of course this only works for a single writer, or if you only want the latest writer.

Upvotes: 1

JoshHetland
JoshHetland

Reputation: 1273

Of more importance than the webserver is the underlying OS and filesystem.

You can (in supported circumstances) obtain an exclusive lock on a file handle in PHP using flock() causing all other attempts at an exclusive lock to block and stack behind it.

Upvotes: 1

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