| ??? 02/22/05 22:07 Read: times |
#88187 - Tasks and Functions Responding to: ???'s previous message |
Erik Malund said:
I have seen far too many applications using a so called RTOS that fail to realise the conditions for using a such and end up with the nightmare of the occasional random failure. I agree 100%. Using an RTOS on an 8051 is a waste of time. Fortunately not I have not seen many people try to do it. However, I believe there are techniques we can steal from the RTOS folks that will help us create better 8051 solutions. That is my only interest in them. You stated in an earlier poist that one of the fancy names for a "task processor" basically was the workloop. Correct. Almost any book on RTOS will say this. I have one in front of me as I write this includes the following example: void main(void)
{
while(TRUE) {
task1();
task2();
task3();
}
}
Each task must do its work quickly and return so that other tasks can run. This technique is referred to by various names including cyclical executive, foreground/background, polling loop, and super loop to name a few. How is calling them "tasks" instead of functions going to make a difference?? Tasks are functions with the special property that they need be able to run concurrently. It is therefore crucial to the success of a real time design that tasks (or concurrent functions - call them what you like) are identified. Ian |
| Topic | Author | Date |
| please expalin RTOS, UnRTOS, MTOS... | 01/01/70 00:00 | |
| Os's | 01/01/70 00:00 | |
| thanks ...and now for Erik... | 01/01/70 00:00 | |
| MicroC O/S II works fine | 01/01/70 00:00 | |
| Threads? | 01/01/70 00:00 | |
| Threads, Real Time and Multitasking | 01/01/70 00:00 | |
| Just for clarification | 01/01/70 00:00 | |
| Multiprocessing | 01/01/70 00:00 | |
| Multiprocessing | 01/01/70 00:00 | |
| Further clarification | 01/01/70 00:00 | |
| Threads | 01/01/70 00:00 | |
| Windoze | 01/01/70 00:00 | |
| More Windoze | 01/01/70 00:00 | |
| Ah... | 01/01/70 00:00 | |
| Basic Info | 01/01/70 00:00 | |
| extract from the above with translation | 01/01/70 00:00 | |
| Completed | 01/01/70 00:00 | |
| who are we | 01/01/70 00:00 | |
Tics | 01/01/70 00:00 | |
| the rest | 01/01/70 00:00 | |
| But wait..there's more! | 01/01/70 00:00 | |
| Real Time Info | 01/01/70 00:00 | |
| hard/soft | 01/01/70 00:00 | |
| Real Time Info | 01/01/70 00:00 | |
| m,y opinion | 01/01/70 00:00 | |
| why so late | 01/01/70 00:00 | |
| one more thing | 01/01/70 00:00 | |
| Architecture Independent | 01/01/70 00:00 | |
| just to clarify | 01/01/70 00:00 | |
| No. | 01/01/70 00:00 | |
| RTOS on a 51?? | 01/01/70 00:00 | |
| not the thing but the word | 01/01/70 00:00 | |
| A Distinction (with a difference) | 01/01/70 00:00 | |
| Tasks or Applications? | 01/01/70 00:00 | |
| Multi Tasking | 01/01/70 00:00 | |
| a dot matrix printer must be one task | 01/01/70 00:00 | |
| One task or three | 01/01/70 00:00 | |
| pray explain | 01/01/70 00:00 | |
| Tasks and Functions | 01/01/70 00:00 | |
| we are getting closer | 01/01/70 00:00 | |
| Not that far apart | 01/01/70 00:00 | |
| I doubt we are | 01/01/70 00:00 | |
| discussed | 01/01/70 00:00 | |
| TTCS | 01/01/70 00:00 |