Define IO#read/write_nonblock with builtins.

IO#read/write_nonblock methods are defined in prelude.rb with
special private method __read/write_nonblock to reduce keyword
parameters overhead. We can move them into io.rb with builtin
functions.

1 files changed, 0 insertions, 123 deletions

diff --git a/prelude.rb b/prelude.rb
index 7cc2d260b6..be249af751 100644
--- a/prelude.rb
+++ b/prelude.rb
@@ -13,129 +13,6 @@ class << Thread
   end
 end
 
-class IO
-
-  # call-seq:
-  #    ios.read_nonblock(maxlen [, options])              -> string
-  #    ios.read_nonblock(maxlen, outbuf [, options])      -> outbuf
-  #
-  # Reads at most <i>maxlen</i> bytes from <em>ios</em> using
-  # the read(2) system call after O_NONBLOCK is set for
-  # the underlying file descriptor.
-  #
-  # If the optional <i>outbuf</i> argument is present,
-  # it must reference a String, which will receive the data.
-  # The <i>outbuf</i> will contain only the received data after the method call
-  # even if it is not empty at the beginning.
-  #
-  # read_nonblock just calls the read(2) system call.
-  # It causes all errors the read(2) system call causes: Errno::EWOULDBLOCK, Errno::EINTR, etc.
-  # The caller should care such errors.
-  #
-  # If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN,
-  # it is extended by IO::WaitReadable.
-  # So IO::WaitReadable can be used to rescue the exceptions for retrying
-  # read_nonblock.
-  #
-  # read_nonblock causes EOFError on EOF.
-  #
-  # On some platforms, such as Windows, non-blocking mode is not supported
-  # on IO objects other than sockets. In such cases, Errno::EBADF will
-  # be raised.
-  #
-  # If the read byte buffer is not empty,
-  # read_nonblock reads from the buffer like readpartial.
-  # In this case, the read(2) system call is not called.
-  #
-  # When read_nonblock raises an exception kind of IO::WaitReadable,
-  # read_nonblock should not be called
-  # until io is readable for avoiding busy loop.
-  # This can be done as follows.
-  #
-  #   # emulates blocking read (readpartial).
-  #   begin
-  #     result = io.read_nonblock(maxlen)
-  #   rescue IO::WaitReadable
-  #     IO.select([io])
-  #     retry
-  #   end
-  #
-  # Although IO#read_nonblock doesn't raise IO::WaitWritable.
-  # OpenSSL::Buffering#read_nonblock can raise IO::WaitWritable.
-  # If IO and SSL should be used polymorphically,
-  # IO::WaitWritable should be rescued too.
-  # See the document of OpenSSL::Buffering#read_nonblock for sample code.
-  #
-  # Note that this method is identical to readpartial
-  # except the non-blocking flag is set.
-  #
-  # By specifying a keyword argument _exception_ to +false+, you can indicate
-  # that read_nonblock should not raise an IO::WaitReadable exception, but
-  # return the symbol +:wait_readable+ instead. At EOF, it will return nil
-  # instead of raising EOFError.
-  def read_nonblock(len, buf = nil, exception: true)
-    __read_nonblock(len, buf, exception)
-  end
-
-  # call-seq:
-  #    ios.write_nonblock(string)   -> integer
-  #    ios.write_nonblock(string [, options])   -> integer
-  #
-  # Writes the given string to <em>ios</em> using
-  # the write(2) system call after O_NONBLOCK is set for
-  # the underlying file descriptor.
-  #
-  # It returns the number of bytes written.
-  #
-  # write_nonblock just calls the write(2) system call.
-  # It causes all errors the write(2) system call causes: Errno::EWOULDBLOCK, Errno::EINTR, etc.
-  # The result may also be smaller than string.length (partial write).
-  # The caller should care such errors and partial write.
-  #
-  # If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN,
-  # it is extended by IO::WaitWritable.
-  # So IO::WaitWritable can be used to rescue the exceptions for retrying write_nonblock.
-  #
-  #   # Creates a pipe.
-  #   r, w = IO.pipe
-  #
-  #   # write_nonblock writes only 65536 bytes and return 65536.
-  #   # (The pipe size is 65536 bytes on this environment.)
-  #   s = "a" * 100000
-  #   p w.write_nonblock(s)     #=> 65536
-  #
-  #   # write_nonblock cannot write a byte and raise EWOULDBLOCK (EAGAIN).
-  #   p w.write_nonblock("b")   # Resource temporarily unavailable (Errno::EAGAIN)
-  #
-  # If the write buffer is not empty, it is flushed at first.
-  #
-  # When write_nonblock raises an exception kind of IO::WaitWritable,
-  # write_nonblock should not be called
-  # until io is writable for avoiding busy loop.
-  # This can be done as follows.
-  #
-  #   begin
-  #     result = io.write_nonblock(string)
-  #   rescue IO::WaitWritable, Errno::EINTR
-  #     IO.select(nil, [io])
-  #     retry
-  #   end
-  #
-  # Note that this doesn't guarantee to write all data in string.
-  # The length written is reported as result and it should be checked later.
-  #
-  # On some platforms such as Windows, write_nonblock is not supported
-  # according to the kind of the IO object.
-  # In such cases, write_nonblock raises <code>Errno::EBADF</code>.
-  #
-  # By specifying a keyword argument _exception_ to +false+, you can indicate
-  # that write_nonblock should not raise an IO::WaitWritable exception, but
-  # return the symbol +:wait_writable+ instead.
-  def write_nonblock(buf, exception: true)
-    __write_nonblock(buf, exception)
-  end
-end
-
 class Binding
   # :nodoc:
   def irb