In C, can we read from pipes without busywaiting, may be using callbacks or other ways?

In C, can we read from pipes without busywaiting, may be using callbacks or other ways?

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In C, can we read from pipes without busywaiting, may be using callbacks or other ways?
Tag : c , By : ezzze
Date : November 28 2020, 11:01 PM

Hope that helps In your code, you haven't set your pipe to non-blocking mode (at least, I assume you haven't, since you don't actually show how you're opening it), and so read() is doing a blocking read. That is, if there is no data available, but some process still has the pipe open for writing, then it will automatically pause your process until more data is available (and will then read that data into the buffer).
Thus, your code works just fine as it is, and there's no need to change it.

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Pipes and callbacks in Haskell

Tag : haskell , By : Tom
Date : March 29 2020, 07:55 AM
Does that help The simplest solution is to use MVars to communicate between the callback and Producer. Here's how:
import Control.Proxy
import Control.Concurrent.MVar

fromMVar :: (Proxy p) => MVar (Maybe a) -> () -> Producer p a IO ()
fromMVar mvar () = runIdentityP loop where
    loop = do
        ma <- lift $ takeMVar mvar
        case ma of
            Nothing -> return ()
            Just a  -> do
                respond a
>>> mvar <- newEmptyMVar :: IO (MVar (Maybe Int))
>>> forkIO $ runProxy $ fromMVar mvar >-> printD
>>> putMVar mvar (Just 1)
>>> putMVar mvar (Just 2)
>>> putMVar mvar Nothing
>>> putMVar mvar (Just 3)

Differences between 2 ways of Rails module included callbacks?

Tag : ruby-on-rails , By : tommy
Date : March 29 2020, 07:55 AM
will help you I'm new to Rails. I have a model called AdvItem, basically what I want to do is to move all its validation statements to a module named AdvItemValidation. After some searches here's what I get: , The form below
def self.included(base)

Two callbacks separated by double pipes?

Tag : javascript , By : Trevor Cortez
Date : March 29 2020, 07:55 AM
This might help you The || operand means "OR", that is, use the success callback if it exists, OR if it does not exist, use onSuccess.

Difference between 2 ways working with pipes using ARGF?

Tag : ruby , By : jedameron
Date : March 29 2020, 07:55 AM
may help you . As Stefan mentioned, you did a little mistake in second case. Proper way of using "ARGF.gets" approach in your case will look like:
while input = ARGF.gets
  # input here represents a line
print while gets

Is there a difference between this two ways of doing callbacks (jQuery)?

Tag : jquery , By : PaulPlum
Date : March 29 2020, 07:55 AM
This might help you I'm just starting to learn jQuery and I've seen this. I don't know if there is any difference or which one would be better. , The callback to .fadeOut call fires when fade out finishes. So this
myDiv.fadeOut('fast', function() {
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