Scheduling and Interrupting

Denis Beydin

Other Parts Discussed in Thread: SYSBIOS

1. Can i use in HWI interrupt-handler synchronisation module like semaphore or event?

2. Can i change scheduling strategy in Task manager settings such as policy of ousting threads(tasks)? Does Task Manager has such settings?

over 12 years ago

0 HRi over 12 years ago

Guru 10750 points

Hi Denis,

Please check the bios6.chm file under the SYS/BIOS version you are using (like - \bios_6_35_01_29\docs) than in search look for semaphore than for each module you have a table stating when you can use it, for example regarding the semaphore you will see the below,

Thanks,

0 Raja over 12 years ago in reply to HRi

TI__Guru* 81335 points

Hi Denis,

Please go through SYS/BIOS on-line training on Interrupts, Tasks & Semaphores from below link.

http://processors.wiki.ti.com/index.php/SYS/BIOS_Training:_Introduction_to_SYS/BIOS

http://processors.wiki.ti.com/index.php/SYS/BIOS_Online_Training

This is a Multi-core device forum, please post us the device related issues & queries to support better.

For SYS/BIOS related queries contact - http://e2e.ti.com/support/embedded/tirtos/f/355.aspx

For CCS related queries contact - http://e2e.ti.com/support/development_tools/code_composer_studio/f/81.aspx

I hope above information helps.

Thanks.

0 Denis Beydin over 12 years ago in reply to HRi

Prodigy 120 points

Thanks for answer on first question!

0 Denis Beydin over 12 years ago in reply to Denis Beydin

Prodigy 120 points

About second question:

I'm looked sysbios task tutorial. As i'm understand, where is no another way to control Task Manager besides enable/disable?

0 HRi over 12 years ago in reply to Denis Beydin

Guru 10750 points

Hi Denis,

What exactly do you want to do with the task (You can change the priority)? or with the scheduler? please note that the SYS/BIOS is an event driven RTOS,

Thanks,

0 Denis Beydin over 12 years ago in reply to HRi

Prodigy 120 points

I'm talking about Task Manager/Scheduler.

In my program to switch between threads I use Task_yield() or Semaphore mechanism. But I want to Task Manager automatically switched threads without my intervention. So if the task is in a loop waiting for response from the interface, then after a fixed time period Task Manager should switch it to other runnable task (task with state "ready"). Multitasking in Windows for example. In Windows Task Manager switch tasks after equal periods of time (quantum). In other words i'm want setup Task Manager settings to automatically switch threads on the end time slice (time interval, time quantum).

Sorry my bad English. :(

0 HRi over 12 years ago in reply to Denis Beydin

Guru 10750 points

Hi Denis,

The Sys/Bios is an event driven and not time driven so you can't do switching base on time slice,

Thanks,

0 David Friedland over 12 years ago in reply to Denis Beydin

TI__Mastermind 18320 points

Well, *something* needs to provide the energy to the kernel to initiate a change in context from one thread to another. A SYS/BIOS application can implement time-slicing in a way that does not require any code within the tasks themselves. In this case, all tasks would be operating at the same priority and a timer would be used to post a semaphore on a regular and constant interval.

An example of this implementation is given in the SYS/BIOS User's Guide.

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Scheduling and Interrupting