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socket: allow explicit buffer for recv and recv_nonblock

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This reduces GC overhead and makes the API more consistent
with IO#read and IO#read_nonblock.

* ext/socket/basicsocket.c (bsock_recv): document outbuf
* ext/socket/unixsocket.c (unix_recvfrom): ditto
* ext/socket/init.c (rsock_strbuf, recvfrom_locktmp): new functions
  (rsock_s_recvfrom): support destination buffer as 3rd arg
  (rsock_s_recvfrom_nonblock): ditto
* string.c (rb_str_locktmp_ensure): export for internal ext
* test/socket/test_nonblock.rb: test recv_nonblock
* test/socket/test_unix.rb: test recv
  [ruby-core:69543] [Feature #11242]

Benchmark results:

             user     system      total        real
alloc    0.130000   0.280000   0.410000 (  0.420656)
extbuf   0.100000   0.220000   0.320000 (  0.318708)

-------------------8<--------------------
require 'socket'
require 'benchmark'
nr = 100000
msg = ' ' * 16384
size = msg.bytesize
buf = ' ' * size
UNIXSocket.pair(:DGRAM) do |a, b|
  Benchmark.bmbm do |x|
    x.report('alloc') do
      nr.times do
        b.send(msg, 0)
        a.recv(size, 0)
      end
    end

    x.report('extbuf') do
      nr.times do
        b.send(msg, 0)
        a.recv(size, 0, buf)
      end
    end
  end
end

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50912 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2015-06-15 20:02:43 +00:00
parent 56368a06a6
commit a02a3f4649
7 changed files with 74 additions and 20 deletions
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6
ext/socket/basicsocket.c
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@ -615,8 +615,7 @@ bsock_do_not_reverse_lookup_set(VALUE sock, VALUE state)
/*
* call-seq:
* basicsocket.recv(maxlen) => mesg
* basicsocket.recv(maxlen, flags) => mesg
* basicsocket.recv(maxlen[, flags[, outbuf]]) => mesg
*
* Receives a message.
*
@ -624,6 +623,9 @@ bsock_do_not_reverse_lookup_set(VALUE sock, VALUE state)
*
* _flags_ should be a bitwise OR of Socket::MSG_* constants.
*
* _outbuf_ will contain only the received data after the method call
* even if it is not empty at the beginning.
*
* UNIXSocket.pair {|s1, s2|
* s1.puts "Hello World"
* p s2.recv(4) #=> "Hell"