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Using thread-local storage via the Ruby API allows us to not worry
about memory management.
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Extra pointers waste space in the DSO. Normally I wouldn't
care, but the string lengths are identical and this code
already made it into another project in this form.
size(1) output:
text data bss dec hex filename
before: 42881 2040 336 45257 b0c9 unicorn_http.so
after: 42499 1888 336 44723 aeb3 unicorn_http.so
ref: http://www.akkadia.org/drepper/dsohowto.pdf
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This can return a static string and be significantly
faster as it reduces object allocations and Ruby method
calls for the fastest websites that serve thousands of
requests a second.
It assumes the Ruby runtime is single-threaded, but that
is the case of Ruby 1.8 and 1.9 and also what Unicorn
is all about. This change is safe for Rainbows! under 1.8
and 1.9.
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