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Re: Simultaneously reading from a file and serving data

by grondilu (Friar)
on Feb 27, 2014 at 17:45 UTC ( #1076425=note: print w/replies, xml ) Need Help??

in reply to Simultaneously reading from a file and serving data

I'm no expert but: can't you just use a fork? I haven't used it for a while but IIRC it's actually not very hard to use and there are several nice examples in perlipc.

Something like:

if (my $pid = fork()) { # network stuff } else { # file stuff }

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Re^2: Simultaneously reading from a file and serving data
by wazoox (Prior) on Feb 27, 2014 at 19:50 UTC
    The problem with a fork is that the %data won't be shared between processes...

      WARNING: I'm afraid this message is actually irrelevant. See EDIT note at the end.

      Well, you can have your two processes communicate with yet another named pipe. I really think you should (re-)read perlipc. There are lots of examples for this kind of stuff. Check out the open() command for instance. You can use it to fork and create a named pipe in the same time. See the "Safe Pipe Opens" section.

      Maybe something like this:

      if (my $pid = open(JSON, '|-') { # database stuff print JSON $json; } else { # this is the child fork. # STDIN here is actually JSON in the other fork. # network stuff my $json = <>; # some more network stuff I guess }

      EDIT I've just realized this wont solve your issue since the child process would block waiting for data from the parent process. It can't do that *AND* act as a network server at the same time. It only moves the blocking problem from one place to an other. So I'm sorry, I don't know.

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