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Multitasking Vs. Multithreading | Embedded Systems
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Methods for multitasking among real‐time embedded compute tasks running on the GPU
Customers who bought this item also bought. Stock Image. Embedded Multitasking Paperback Keith E. New Paperback Quantity Available: Book Depository hard to find London, United Kingdom. Seller Rating:. Published by Newnes Chiron Media Wallingford, United Kingdom. So, instead of design and troubleshooting drivers and stacks, you can start from a perfectly working point without worrying with all those lower-level stuff. That results in a substantial decrease in development time. Along with that, another important aspect which is usually underestimated is code maintenance.
Top 10! Embedded Multitasking (Embedded Technology)
Embedded applications, as any other piece of software, are subject to improvement, new features and newer technologies. Whatever is the case, an RTOS-based application will be much easier to maintain and improve than a bare metal single task one. Once the project has been created, we should see a screen such as the one shown in figure 4. It yours in not like that, try double-clicking configuration. Also, it cannot be changed. The second thread Blinky thread is the user thread created by E 2 Studio.
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It has an example code we are going to change later. We are keeping all as it is for now. Now if we compile the application and debug it we will see LED1 green blinking at 0.
By default, ThreadX is configured to operate at ticks per second, that is, each tick takes 10ms. But what happens when the thread is suspended?
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Technically it is removed from the ready queue list and an internal counting is started within the kernel. As there is no other tasks to run, the RTOS will simply wait for the next tick and so on until the internal counter reaches When that counter expires, the thread is moved to the READY list again and will be scheduled as the next thread to run if no other higher priority thread is also ready to run the lower the priority level, the higher is its priority. In our case, as there is no other thread, it will run as soon as that counting expires!
This file stores code for our second thread, open it and insert the function code as shown below:. Program testing figure 6 shows that the threads start at the same time and so the LEDs but even having the same theorical delay, soon after started the LEDs are blinking without synchronism.
Can you tell why? The second thread, on the other hand, relies on a software delay to do the same thing. That means every time a tick happens that is times per second the thread is interrupted for a while and supposing thread 1 is suspended thread 2 is resumed again.
That makes the software delay to last for more time than expected and calculated , so the red LED ends up going out of synchronism because its blinking period is slightly higher! Note that if we had more tasks running, that time would be even higher! The result is shown in figure 7. Now both LEDs blink at the same frequency and in absolute synchrony! This is our first rule regarding the bare-metal to multi-threaded programming paradigm transition: software delays are not reliable within an RTOS and should be avoided at all cost!
Instead, prefer using kernel timing functions which are context-switch aware and also allow better CPU utilization.