multithreading - What are some good use cases for calling 'yield' in a thread? -

-

Many languages ​​that support multi-threading provide an action to present a thread to the reference switch in other threads allows for. Haskell for example.

However, the documentation does not tell what the real use cases are. Is it worthwhile to use these yield tasks, and when not?

Recently I have seen such an experiment where it has been found that when a network server sends a message, before trying to get the data yield is worth calling, because the customer takes some time to answer and issue another request.

Yield when you call, like other examples or guides.

I am mainly interested in Haskell, but I have no problem learning about other languages ​​or concepts in general.

Note: It is not used with generator or cortinin, such as yield in Python or Ruby.

The use of GHC's IO Manager to improve the performance yield < / Code> does. Can be found on use but I will paste it here as well. 

  step :: EventManager - & gt; IO State Stage @ Event Manager {..} = WaiterForio State & lt; - readIORef emState state `seq` return status where wait = n1 & lt; - I.poll embackend Nothing (onFdEvent MGR) when generated (N1 = 1 = $) = $ N2 and Lieutenant; - I.poll emBackend Nothing (onFdEvent MGR) when (n2 = 0 = $) $ & lt; - I.poll emBackend (bus forever) (onFdEvent mgr) return < The use of the [first non-blocking] voting fails to find the events, we give yields the election loop thread at the end of the Haskel run queue when it comes back, we have another non-blocking If we get lucky and ready, if he does not even give an event, then we do a blocking poll.   
 Then  yield  is used to reduce the number of blocking elections,  EventManager  will be done.

Comments

Post a Comment

Popular posts from this blog

java - org.apache.http.ProtocolException: Target host is not specified -

-
I have written a simple httprequest / response code and I am getting this error below: I used to type in my classpath httpclient, httpcore, common -Codecs and general logging. I am very new to Java and I do not know what's going on here. Please help me. code: import org.apache.http.client.HttpClient; Import org.apache.http.client.methods.HttpGet; Import org.apache.http.HttpResponse; Import org.apache.http.impl.client.HttpClientBuilder; Import org.apache.http.Header; Import org.apache.http.HttpHeaders; Public class UnshorteningUrl {public static zero main (string [] args throws exception {HttpGet request = zero; HTTP Client Client = HTTP ClientBuilder.credit (). Build (); Try {Request = New HTTP Gate ("trib.me/1lBFzSi"); HttpResponse httpResponse = client.execute (request); Header [] header = httpResponse.getHeaders (HttpHeaders.LOCATION); // Preconditions.checkState (headers.length == 1); String new url = header [0] .getValue (); System.out.println ("new url...
Read more

java - Gradle dependencies: compile project by relative path -

-
Is it possible to specify a dependency on another gradeal project in the granular (in android studios) outside the current project limits? For example, with a relative path like this: dependence {collection project ('../../ stdlib / dagger'}} MyApp (path / user / foo / workspace / mypad) The app (Path / User / Foo / Workspace / MyPass / App) And I have an Android Library Project with 3 subdomules: stdlib (path is / user / foo / Utilities (Path / User / Foo / Workspace / Stadlib / Utilis) http (Path / User / Foo / Workspace / Stadlib / HT) / Li> What I have to do is compile the Dagger, Util, http module in the MyApp project. The Stidelib Library module under heavy development And MyApp will grow in the form of Growth, so I do not want to push them into a Mewen repository. I am a little change. is likely to add another Gredle projects in some way? I will push the study library into the Maven repository after the source is in search of a temp...
Read more

ruby on rails - Object doesn't support #inspect when used with .include -

-
So I have participated in a glitch error that I do not even know how to debug. I am very new to the railing, so it has kicked my ass well when I use the .includes (school) seen by the student, it gives a blue box error, But when I look at any other model and .includes (school) , the school works just fine. class student & lt; ActiveRecord :: Base has has_many: relationships, foreign_key: "liker_id", dependent :: has_many: matches, foreign_key: "student_1_id", dependent :: deleted belong_to: school belong_to: conference belong_to: would_you_rather belong_to: home city belong_to: year is_to: Major and class school & lt; on the console activatecord :: Affiliate for the base: conference includes: respondent, class: "school", foreign_key: "rival_id" (e.g. For: School) Select SQL generated Select "School". * "School" from "school" "ID" IN (1) error message back NoMethodError: u...
Read more