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# Copyright, 2020, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require_relative 'clock'
module Async
class Scheduler
if Fiber.respond_to?(:set_scheduler)
def self.supported?
true
end
else
def self.supported?
false
end
end
def initialize(reactor)
@reactor = reactor
end
attr :wrappers
def set!
Fiber.set_scheduler(self)
end
def clear!
Fiber.set_scheduler(nil)
end
private def from_io(io)
Wrapper.new(io, @reactor)
end
def io_wait(io, events, timeout = nil)
wrapper = from_io(io)
if events == ::IO::READABLE
if wrapper.wait_readable(timeout)
return ::IO::READABLE
end
elsif events == ::IO::WRITABLE
if wrapper.wait_writable(timeout)
return ::IO::WRITABLE
end
else
if wrapper.wait_any(timeout)
return events
end
end
return false
rescue TimeoutError
return nil
ensure
wrapper&.reactor = nil
end
# Wait for the specified process ID to exit.
# @parameter pid [Integer] The process ID to wait for.
# @parameter flags [Integer] A bit-mask of flags suitable for `Process::Status.wait`.
# @returns [Process::Status] A process status instance.
def process_wait(pid, flags)
Thread.new do
::Process::Status.wait(pid, flags)
end.value
end
def kernel_sleep(duration)
self.block(nil, duration)
end
def block(blocker, timeout)
@reactor.block(blocker, timeout)
end
def unblock(blocker, fiber)
@reactor.unblock(blocker, fiber)
end
def close
end
def fiber(&block)
task = Task.new(@reactor, &block)
fiber = task.fiber
task.run
return fiber
end
end
end
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