[ruby-core:55891] [ruby-trunk - Feature #5138] Add nonblocking IO that does not use exceptions for EOF and EWOULDBLOCK

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Issue #5138 has been updated by tenderlovemaking (Aaron Patterson). =begin Just another data point. I ran the benchmarks that Charles showed on my implementation in MRI. We also see a good speed improvement on MRI: $ ruby -rbenchmark -rsocket -e "sock = TCPSocket.new('google.com', 80); 10.times { puts Benchmark.measure { 100_000.times { begin; sock.read_nonblock(1000); rescue; end } } }" 0.650000 0.110000 0.760000 ( 0.769794) 0.620000 0.110000 0.730000 ( 0.721198) 0.600000 0.090000 0.690000 ( 0.701172) 0.640000 0.110000 0.750000 ( 0.738934) 0.600000 0.100000 0.700000 ( 0.702289) 0.600000 0.090000 0.690000 ( 0.694982) 0.630000 0.110000 0.740000 ( 0.737876) 0.630000 0.100000 0.730000 ( 0.729356) 0.640000 0.110000 0.750000 ( 0.743386) 0.600000 0.100000 0.700000 ( 0.705391) $ ruby -rbenchmark -rsocket -e "sock = TCPSocket.new('google.com', 80); 10.times { puts Benchmark.measure { 100_000.times { begin; sock.try_read_nonblock(1000); rescue; end } } }" 0.160000 0.070000 0.230000 ( 0.230004) 0.150000 0.080000 0.230000 ( 0.224267) 0.170000 0.080000 0.250000 ( 0.253598) 0.150000 0.070000 0.220000 ( 0.221024) 0.150000 0.070000 0.220000 ( 0.225998) 0.160000 0.070000 0.230000 ( 0.223979) 0.150000 0.080000 0.230000 ( 0.231132) 0.160000 0.070000 0.230000 ( 0.233416) 0.160000 0.080000 0.240000 ( 0.238810) 0.150000 0.070000 0.220000 ( 0.222216) =end ---------------------------------------- Feature #5138: Add nonblocking IO that does not use exceptions for EOF and EWOULDBLOCK https://bugs.ruby-lang.org/issues/5138#change-40391 Author: wycats (Yehuda Katz) Status: Assigned Priority: Normal Assignee: matz (Yukihiro Matsumoto) Category: core Target version: next minor The current Ruby I/O classes have non-blocking methods (read_nonblock and write_nonblock). These methods will never block, and if they would block, they raise an exception instead (IO::WaitReadable or IO::WaitWritable). In addition, if the IO is at EOF, they raise an EOFError. These exceptions are raised repeatedly in virtually every use of the non-blocking methods. This patch adds a pair of methods (try_read_nonblock and try_write_nonblock) that have the same semantics as the existing methods, but they return Symbols instead of raising exceptions for these routine cases: * :read_would_block * :write_would_block * :eof The patch contains updates for IO, StringIO, and OpenSSL. The updates are fully documented and tested. -- http://bugs.ruby-lang.org/