Module: Libuv

Extended by:
Accessors
Defined in:
lib/libuv.rb,
lib/libuv/q.rb,
lib/libuv/dns.rb,
lib/libuv/tcp.rb,
lib/libuv/tty.rb,
lib/libuv/udp.rb,
lib/libuv/file.rb,
lib/libuv/idle.rb,
lib/libuv/pipe.rb,
lib/libuv/work.rb,
lib/libuv/async.rb,
lib/libuv/check.rb,
lib/libuv/error.rb,
lib/libuv/spawn.rb,
lib/libuv/timer.rb,
lib/libuv/handle.rb,
lib/libuv/signal.rb,
lib/libuv/ext/ext.rb,
lib/libuv/prepare.rb,
lib/libuv/reactor.rb,
lib/libuv/version.rb,
lib/libuv/fs_event.rb,
lib/libuv/ext/types.rb,
lib/libuv/coroutines.rb,
lib/libuv/fiber_pool.rb,
lib/libuv/filesystem.rb,
lib/libuv/mixins/net.rb,
lib/libuv/mixins/stream.rb,
lib/libuv/mixins/listener.rb,
lib/libuv/mixins/resource.rb,
lib/libuv/mixins/accessors.rb,
lib/libuv/mixins/fs_checks.rb,
lib/libuv/ext/platform/unix.rb,
lib/libuv/mixins/assertions.rb,
lib/libuv/ext/platform/windows.rb,
lib/libuv/ext/platform/darwin_x64.rb

Defined Under Namespace

Modules: Accessors, Assertions, Ext, FsChecks, Listener, Net, Q, Resource, Stream Classes: Async, Check, Dns, Error, FSEvent, FiberPool, File, Filesystem, Handle, Idle, Pipe, Prepare, Reactor, Signal, Spawn, TCP, TTY, Timer, UDP, Work

Constant Summary collapse

DefaultThread = 
Thread.current
VERSION = 
'4.0.9'

Constants included from Accessors

Accessors::Functions

Class Method Summary collapse

Methods included from Accessors

reactor

Class Method Details

.co(*yieldable) ⇒ Object

Takes a Promise response and turns it into a co-routine for code execution without using callbacks

Parameters:

  • *promises (::Libuv::Q::Promise) —

    a number of promises that will be combined into a single promise

Returns:

  • (Object) —

    Returns the result of a single promise or an array of results if provided multiple promises

Raises:

  • (Exception) —

    if the promise is rejected



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# File 'lib/libuv/coroutines.rb', line 16

def co(*yieldable)
    on_reactor = Libuv::Reactor.current
    raise 'must be running on a reactor thread to use coroutines' unless on_reactor

    f = Fiber.current
    wasError = false

    # Convert the input into a promise on the current reactor
    if yieldable.length == 1
        promise = yieldable[0]
        # Passed independently as this is often overwritten for performance
        promise.progress &Proc.new if block_given?
    else
        promise = on_reactor.all(*yieldable)
    end

    # Use the promise to resume the Fiber
    promise.then(proc { |res|
        if Libuv::Reactor.current == on_reactor
            f.resume res
        else
            on_reactor.schedule { f.resume(res) }
        end
    }, proc { |err|
        wasError = true
        if Libuv::Reactor.current == on_reactor
            f.resume err
        else
            on_reactor.schedule { f.resume(err) }
        end
    })

    # We want to prevent the reactor from stopping while we are waiting on a response
    on_reactor.ref
    result = Fiber.yield # Assign the result from the resume
    on_reactor.unref

    # Either return the result or raise an error
    if wasError
        if result.is_a?(Exception)
            backtrace = caller
            backtrace.shift
            if result.respond_to?(:backtrace) && result.backtrace
                backtrace << '---- continuation ----'
                backtrace.concat(result.backtrace)
            end
            result.set_backtrace(backtrace)
            raise result
        else
            e = case result
            when String, Symbol
                CoroutineRejection.new(result.to_s)
            else
                CoroutineRejection.new
            end
            e.value = result
            raise e
        end
    end
    result
end

.cpu_count ⇒ Integer?

Returns the number of CPU cores on the host platform

Returns:

  • (Integer, nil) —

    representing the number of CPU cores or nil if failed



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# File 'lib/libuv.rb', line 53

def self.cpu_count
    cpu_info = FFI::MemoryPointer.new(:pointer)
    cpu_count = FFI::MemoryPointer.new(:int)
    if ::Libuv::Ext.cpu_info(cpu_info, cpu_count) >= 0
        count = cpu_count.read_int
        ::Libuv::Ext.free_cpu_info(cpu_info.read_pointer, count)
        return count
    else
        return nil
    end
end