Hello, Could someone help!?.. I always thought that it was technically possible under mod_perl to share memory between Child processes..
Having spent the w/e getting to grips with startup.pl's and the such I'm beginning to discover that it's only possible to share read-only memory and as soon as you write to memory it splits off.. .. What I really want to do is to write a module that can be accessed from any of the child apache processes such that some work can be done at one stage, and if the second request comes through to another child, that child can pick up on the work of the first.. .. Is there _absolutely_ no way that two children could ever have write access to the same object? Can the parent process not look after a single object and allow children to make requests to functions within the parent process that might alter the values of that object without breaking the object into individual copies for each child?? Lastly, coming from a RiscOS background, it was always possible to issue module interrupts such that one program can call the functions of another completely separate program.. If this is possible in Perl, is it therefore possible that one could set up a daemon of sorts that would allow the Apache children to communicate with it. If we were to take a simple counter as an example, the parent-process/daemon would hold a variable $count; and allow child processes to call a sort of "my $current = get_count();" .. get_count would simply add one to $count and return the total value.. .. but all children would be able to call the get_count sub.. the actual value of $count would be held by some parent/daemon process independent of Apache.. . . It seems to me I'm missing some pretty basic inter-program communication stuff.. but then all my experience of calling one linux prog from another has usually worked by piping something from one to another..? - Am I asking the impossible? Is it not the sort of thing Linux is capable of or have I just missed the obvious solution? TIA & ATB, Jimbo _____________________________ Jim Morrison Technology & Development Partner Isotope Communications 9 Green Park Station Bath, BA1 1JB, UK +44 (0) 1225 444 674
