Re^6: [threads] Open a file in one thread and allow others to write to it

[gulden]

«That's why I used a shared variable to coordinate »

Your lock variable coordinates the concurrency between Perl Threads, it won't sync the OS File->writes, cos each Thread is using a cloned FileHandled and you are trusting OS Synchronization.

Now I make you a question? Why are you using a lock variable, since you are using a cloned FileHandle that is not shared between threads? You are trusting the OS sync, so the use of that shared LOCK variable is useless.It only minimizes OS->File->Writes thread concurrency

[BrowserUk]

Why are you using a lock variable,

Because in the past I have (frequently) seen the situation where separate threads writing to the same file concurrently through buffered IO, would flush buffer-fulls, not lines, and so result in fragmentary interleaving.

And in the absence of anyone with demonstrably authoratative knowledge prepared to answer such questions, I go by the empirical eveidence of what actually happens when I do things.