Re^2: threads: spawn early to avoid the crush.

If the main program needed another process it would ask the original parent to do it for it.

Could you explain that in a bit more detail for me? I've never done much with fork, especially in Perl.

How does the main code inform it's parent when it is time to create another process?
If there can be multiple other processes that might need to be run, how does the main code tell teh parent which one to create?
How does the new process get it's parameters?
How does the main code retrieve the results from the new process?

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Comment on Re^2: threads: spawn early to avoid the crush.

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Re^3: threads: spawn early to avoid the crush. by Anonymous Monk on Mar 02, 2006 at 16:46 UTC
Here's a simple answer to interprocess communication: use pipes. `#!/usr/bin/perl -w #use forking open to start 3 more processes unless (open X, "-\|") { print 1+5; exit }; # X=1+5 unless (open Y, "-\|") { print 23; exit }; # Y=23 unless (open Z, "-\|") { print <X>+<Y>; exit }; # Z=X+Y print "Z = "; print <Z>."\n";` [download]	[reply] [d/l]

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Re^3: threads: spawn early to avoid the crush.
by Anonymous Monk on Mar 02, 2006 at 16:46 UTC

pipes

#!/usr/bin/perl -w
#use forking open to start 3 more processes

unless (open X, "-|") { print 1+5;     exit }; # X=1+5
unless (open Y, "-|") { print 2*3;     exit }; # Y=2*3
unless (open Z, "-|") { print <X>+<Y>; exit }; # Z=X+Y

print "Z = "; print <Z>."\n";
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