.NET Scheduling Threads?
Oct 25, 2010
I am having an issue where I need to implement a type of thread scheduling... I'm looking to implement a list of tasks, each with a set time that they need to execute, and after the time is up they will execute the respective code that goes with that task. I would use a timer based solution, however, I don't think that it would be very efficient. There will be a very large list of tasks, some of which need to be executed within seconds of being placed in the list.
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Oct 19, 2011
I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.
What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).
What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?
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Dec 30, 2009
I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
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Jan 27, 2010
Add a scheduling app in my project..were can i get the source code for this?or were do i start in making one.
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Jun 5, 2011
at - arrival time
bt - burst time
I - idle
for example the user input 3 process
process 1 - at = 5
bt - 5
process 2 - at - 2
[code].....
this is the logic : smallest time + burst time = sum1 if the next arrival time is less than the sum1 then add the next burst time but if the next arrival time is greater than the sum1 then subtract the sum1 to the arrival time so you will get the difference1. after that the difference1 must be added to the sum1 then add the burst time. that is the cycle.
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Mar 15, 2012
How to create a program of CPU Scheduling, particularly, Preemptive one, like SRT, Round Robin etc. How can I make them using VB.NET.
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Jun 18, 2009
I am trying to write a vb.net code which would run evry moth and perform the following task:
it would retrieve three existing excel files from a folder ,perform excel based reporing modification on them and send them as emails to alist of users ids of whom are available in a fourth excel sheet(another folder)
i am not looking for thhe full code. but i donot know the syntax for
how to access excel files from within a vb code and morover perform operations on them.
secondly is it possible to scedule such a email sending application ??
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Mar 6, 2010
What is the best way to schedule task on VB.Net application? I have searched this forum and google but I still need some more comments.There are two ways that I've found so far:
Command Prompt By using AT or SCHTASKS command. My Windows 7 seems to recogonise both Command. May I know is there any significant different between this two command?
Timer By using Timer function, but I'm not sure whether is this a good method as it might slow down my program by constantly checking. May I know by using the above method, can I retrieve the scheduled task and display back in my program with ease?
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May 23, 2012
I have a program that checks for the date and minute part of my job object. If these match then it triggers a particular job.
If jb.ScheduledStartTime.Value.ToString("MM/dd/yyyy mm") =
Now().ToString("MM/dd/yyyy mm") Then
'Do some work here.
End If
Issue:If I schedule different jobs during the day at different time interval then they just work fine. I mean they are triggered and in the above code they enter the loop when it matches the current format.
However, it doesn't work when the date changes at 12:00. Even though I have scheduled start time set to trigger at 9:00 AM in the morning it enters the loop exactly at 12:00 AM which is invalidating my logic leaving me confused.
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Sep 28, 2011
I have 5 separate class libraries where each one of thses are consuming separate web services (the web services connects to a server, runs stored procedures and return data tables to the .dll).
My task is to sequentually run these 5 jobs unattended through a job scheduler. I am not really sure how to do this and what my options are.I was planning on creating a driver (a console application) that would call each .dll. If this is a acceptable way then I am not sure how to reference and call each .dll, could I use import, add a reference to the .dlls and instantiate a new class, make a setup project with dependancies etc.
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Mar 18, 2009
I need references to how to schedule emails to notifiy users on a specific date in the month (each month).All the references I stumbled upon were in C#.I'm not that advanced to convert them properly to VB dot net.
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Mar 20, 2012
I'm wondering if there is any scheduler control in Vb.Net -MS VS 2005- and if not I hope I can find a one - free - that I could use on my application...
how to implement scheduling tasks requirement in my application..
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Nov 22, 2010
I have an application that I need to automate where at a certain time each day, say 6pm, it will run a certain method(which is to check a database for key terms and then access the api to search for these terms). But there is also another process which is running all the time accessing the stream api so when the search is complete, it interrupts the stream and hands over the new terms.
Now I thought of adding the .exe file to windows task scheduler but not sure if that would work. The stream method run indefinitely and at 6pm each day another process needs to run. I thought of using the system.threading.task TaskFactory but when I include it, it shows taskfactory as undefined. ( I do have .net framework 4.0)If it launches using the task scheduler as 6pm with my code logic as follows:
[Code]...
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May 5, 2010
I have a question for the well versed among you. I have done some research, but didn't seem to find the exact answer I was looking for. So without further adieu.Given an event which needs to occur at a very specific time, whats the best and most predictable way or making that happen.
A: Use a worker thread, and threading.thread.sleep(TIME).
or B: Use System.Timers.Timer or System.Threading.Timer to execute in (TIME).
NOTE- I am fully aware that any of these will work. My question is in regards to priority of execution. How will a timer, which I can't figure out how to set a priority on, compare to a thread with a priority of Highest or even Real Time. Microseconds DO count in this instance.
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Jun 2, 2008
I'm currently using SQL Server 2005 and I've created a business intelligence solution that has a "Package1" copying a table from a database to my local database. I tried executing this package/solution from my .Net IDE and it worked.
Later, I tried creating a job that will execute the package at the intervals of 1 hour per day using SQL Server Agent but when I get to the part where I select the type of job (under the "Job step property", I can't find the job type of "SQL Server Integration Services Package". I've been following this: http://www.mssqltips.com/tip.asp?tip=1180 tutorial but I can't execute my job probably because I'm using an incorrect job type.
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Sep 2, 2011
I'm building an application that will need to run a specific functions at user defined times I need help with setting up the schedule part of the app. What I would ideally like to do is be able to set up an "event" which will occur at a specific time and date or at a specific time on specific days such as 9:00 Monday's Tuesday's Wednesday's and Saturday's.
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Feb 27, 2010
I have a problem in detecting the 30 minutes interval in time scheduling like for example i have a combobox(starting_time) and combobox2(endtime) and I select there 9:30-10:00 it has 30 minutes I want to show a message box that I should be 1 hour.
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Dec 10, 2010
I once saw in an app a control that allowed the user to choose when they wanted the Timer running. It looked something like this: And when the squares are green, for example Tuesday 3:15 AM - 4:15 AM, the timer would run during that time period. I'm curious as to what control will allow me to do something similar?
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Jan 15, 2012
am doing my thesis entitled Automatic Exam Scheduling System. this works when button "GENERATE" is click. that would initialize the automatic assigning of proctors and rooms to classid.....plz help...i can't filter the conflicts of proctors and rooms since it is automated.
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Apr 16, 2011
I am trying to make a random shift scheduling application for a rotating workforce that must satisfy the following basic requirements: 3 shifts (8 hours each) per day (Morning, Afternoon, Night), 2 workers per shift work a maximum of 7 consecutive days and rest a minimum 1 day. 9 Total workers separate in 5 supervisors and 4 operators, and 2 part time workers (1 supervisor and 1 operator) for covering the possible absences of 9 standard workers. Total days off are 8 days per month (normal sequence 2,2,4) and the vacation days are 22 per year. A basic rule is that the shift must cover from 2 supervisors, or 1 supervisor and 1 operator. 2 operators are forbidden.
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Sep 14, 2011
I need to run TWO Threads in a web application, .NET. 3.5 Both methods MakeRedCars and MakeBlueCars need to run at the same time as both take 5 seconds. I have tried many example codes with very bad results. I dont need anymore than 2 threads. The main issue I am having is knowing how to wait till they are finished and also how to store the results from each.Each of the Methods do different things, one is a web request, one is a sql call.
Both methods return a list of(cars) for example do:
carList.addrange(MakeRedCars())
carList.addrange(MakeBlueCars())
for each car in carlist<br>
response.write(car.colour + "<r>")
next
I have implemented the answered below and with empty objects all works well, as soon as you hook in a database call that returns the data/objects studio does a JIT and crashes.
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Jan 28, 2011
I can only run "so many" threads concurretnly, a notion which I have seen elsewhere.As a threading novoice, how can I determine the maximum number of threads to use? Or is this a "how long is a piece of string" question? What does it depends on? Hardware config or what?
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Apr 18, 2010
it would be best if I just copy and pasted the code (it's very trivial).
Private Sub Main() Handles MyBase.Shown
timer.Interval = 10
timer.Enabled = True
End Sub
[code]....
An exception, "The object is currently in use elsewhere", is raised during the tick event.
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Jun 10, 2010
I have 2 thread.One that put some data inside a list?the second that take out these data from the same list.what is the best "list" that allows one thread to put something inside and another one that take stuff out>
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Nov 7, 2010
My application generates some background threads to perform some slow jobs (a cycle of ask for a long process to a server - wait - download the result).
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Feb 25, 2009
I'm having a bit of an issue killing threads off and resetting my form. After starting the threads, everything runs fine. When I want to cancel the threads, the threads are all killed off "properly" using the Abortable Thread Pool, but how do I know that all the threads are dead? I've tried using both GetAvailableThreads and GetMinThreads compared against the thread count that should be running if they're all killed off, but I can't seem to get it to work. The only time I can get the GetAvailableThreads to return the "correct" number is if I freeze one thread and kill off the rest.
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May 28, 2010
I have a GUI that is running for a form, let's call it Class xWindow. It has finished processing data and is simply waiting for the user to press a button, i.e. the main thread has nothing to do. Just before it finished processing, it kicked started something that has a callback function which occurs in a new thread (e.g. a system timer or a Bonjour callback to say that a service has been found on a port). This callback occurs within the xWindow class.
[Code]....
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Dec 22, 2010
Suppose I have created 70 "rule-finder" objects, and I want to run each one on data.This is a time-consuming process.The new computers with the I7 chip can run 7 processes in parallel, and so I was thinking of running 7 threads at a time. Asone thread ends, I would add another, until all 70 objects are used. When the last rule-finder has completed, I would resume the main course of the program.
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Jun 1, 2009
how can I let two threads communicate with each other by using VB.net?
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Jan 25, 2010
I currently have a program that runs several "intense" queries. I added a textbox and presented status updates when a query was starting, eding and how many were left. This would suite my need, but the textbox doesn't actually display anything until all the queries are finished. It then displays all the updates at once. I'm assuming updating the textbox in another thread would solve this issue, and that is where I am lost. How can I use a thread that receives a message from the main form running the query and have it display it in the textbox?
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