scheduling

I'm wondering if there's a way to block a userspace task from kernel space? Is there a function already in the kernel for this? I have tried to look but found nothing obvious so far. In UP, this is quite simple: set the state of the task to TASK_INTERRUPTIBLE and call schedule() . You can "resume" it later by setting its state to TASK_RUNNING . In SMP, you have to make sure that the task is not running on another CPU. See this: http://lxr.linux.no/linux+v3.0.4/include/linux/sched.h#L242 250/* 251 * This serializes "schedule()" and also protects 252 * the run-queue from deletions/modifications

In a spring application I want do some background computing. The task is that I save an entity( lets say a GPS coordinate) and then I want to query a web service to get distance between all the coordinates and store them in the db for later use. There is a possibility that after storing the entity, connection cannot be made to the web service which will be used for calculation of the distances. I think that this can be accomplished with introducing a job in the system (some thing like a cron job). Once we want some thing to happen in the background we put it in a job queue. The queue will try

Can anyone recommend a free asp.net control that I can use for the following: Weekdays Monday-Saturday along the top row Time of day along left hand side Template fields for the actual data Databindable Cells span the rows based on the start time and end time Here is a control that I found that is pretty good, but I am trying to find alternatives: Databound Schedule controls DayPilot is a pretty good general purpose calendaring/schedule control. The full version is not free, but there is a "lite" version available which is not only free but open source! 来源： https://stackoverflow.com/questions

I have a 2 processes to perform in my swing application, one to fill a list, and one to do operations on each element on the list. I've just moved the 2 processes into Swingworker threads to stop the GUI locking up while the tasks are performed, and because I will need to do this set of operations to several lists, so concurrency wouldn't be a bad idea in the first place. However, when I just ran fillList.execute(); doStuffToList.execute(); the doStuffToList thread to ran on the empty list (duh...). How do I tell the second process to wait until the first one is done? I suppose I could just

Just to head off any comments to the effect of "why do you need to know this??": This is just a puzzle I was curious about, not something I need to do for any practical reason. Given a typical POSIX system[1], how would you design an experiment to determine the scheduling quantum[2] of a CPU-bound process? [1]: but NOT one that lets you query for this information through a syscall or /proc interface [2]: "Scheduling quantum" is defined as the amount of time a process will run on the CPU without blocking or yielding before its scheduled time is over and the OS lets a different process run. I'm

I understand that the scheduling is done by the kernel. Let us suppose a process (P1) in Linux is currently executing on the processor. Since the current process doesn't know anything about the time slice and the kernel is currently not executing on the processor, how does the kernel schedule the next process to execute? Is there some kind of interrupt to tell the processor to switch to execute the kernel or any other mechanism for the purpose? Arun In brief, it is an interrupt which gives control back to the kernel. The interrupt may appear due to any reason. Most of the times the kernel gets