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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 ( #1076440=note: print w/ replies, xml ) Need Help??


in reply to Re: Simultaneously reading from a file and serving data
in thread Simultaneously reading from a file and serving data

The problem with a fork is that the %data won't be shared between processes...


Comment on Re^2: Simultaneously reading from a file and serving data
Re^3: Simultaneously reading from a file and serving data
by grondilu (Pilgrim) on Feb 28, 2014 at 19:31 UTC

    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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