ruby - Blocking Call In Popen -

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pipe = io.popen('./myblockingprogram') while line = pipe.gets   puts "hello world" end

where myblockingprogram program blocks until receives data on network, , prints text stdout. tested running bash directly works great.

however, when run program above, never see "hello world" lines printed stdout (the console). wrong popen starts whole new process... , therefore though makes blocking call should not prevent main ruby program running due global interpreter lock?

is there better way structure program this, want read text lines output program , process results in way (there no terminating condition, may run forever)?

make sure myblockingprogram flushes output buffer when writes stdout.

a simple example myblockingprogram is:

#!/bin/ruby 100.times     sleep 10     $stdout.puts "hello world"     $stdout.flush end

without flush command don't see result pipe until subprocess finishes. flush command, see intermediate results subprocess.


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