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%a{annotate:rdoc:skip}
class IO
# <!--
# rdoc-file=ext/io/wait/wait.c
# - io.nread -> int
# -->
# Returns number of bytes that can be read without blocking. Returns zero if no
# information available.
#
def nread: () -> Integer
# <!--
# rdoc-file=ext/io/wait/wait.c
# - io.ready? -> true or false
# -->
# Returns `true` if input available without blocking, or `false`.
#
def ready?: () -> boolish
# <!--
# rdoc-file=ext/io/wait/wait.c
# - io.wait(events, timeout) -> event mask or false.
# - io.wait(timeout = nil, mode = :read) -> event mask or false.
# -->
# Waits until the IO becomes ready for the specified events and returns the
# subset of events that become ready, or `false` when times out.
#
# The events can be a bit mask of `IO::READABLE`, `IO::WRITABLE` or
# `IO::PRIORITY`.
#
# Returns `true` immediately when buffered data is available.
#
# Optional parameter `mode` is one of `:read`, `:write`, or `:read_write`.
#
def wait: (Integer events, ?Numeric timeout) -> (self | bool | nil)
| (?Numeric? timeout, *wait_mode mode) -> (self | bool | nil)
type wait_mode = :read | :r | :readable | :write | :w | :writable | :read_write | :rw | :readable_writable
# <!--
# rdoc-file=ext/io/wait/wait.c
# - io.wait_readable -> true or false
# - io.wait_readable(timeout) -> true or false
# -->
# Waits until IO is readable and returns `true`, or `false` when times out.
# Returns `true` immediately when buffered data is available.
#
def wait_readable: (?Numeric? timeout) -> (self | bool | nil)?
# <!--
# rdoc-file=ext/io/wait/wait.c
# - io.wait_writable -> true or false
# - io.wait_writable(timeout) -> true or false
# -->
# Waits until IO is writable and returns `true` or `false` when times out.
#
def wait_writable: (?Numeric? timeout) -> boolish
end
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