multithreading - Is Session variable thread-safe within a Parallel.For loop in ASP.Net page -

-

Would it be safe to change a session variable (i.e., the session ["progress"]) in the code below?

This code is part of the code-behind of the ASP.Net page.

On running a loop in parallel, two iterations run simultaneously and the same session variable has been replaced by both iterations. 

  public zero-long operation () {parallel. (0, Total Member, (i, LoopState) => {Thread. Sleep (2000); Wait for some time ++; session ["Progress"] = Progress to simulate processing progress; // Is this thread-safe?}); }

This thread is not secure , but Is safe to change sessions in separate open pages .

So if you call in certain circumstances, then it is safe.

This is because the only one time from your page , then it is safe in different pages, because the session is fully loaded from the beginning of the page load to the session Locks up

To prove some similar answers.



If you call it different threads from from the same page , You need synchronization

notes

  • If this loop takes a long time to complete then all users will calculate that calculation And will not only lock the session user all users will be locked by session lock if many users make calls then all users will be together Sector will wait longer. So you may need to calculate this on a scheduler task.
  • If the time to process the data inside the loop the time of the loop decreases and synchronize threads from that time, then the parallel loop It takes more time to complete with a simple loop. So you need to calculate the speed for a simple loop and parallel loop.

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