 |
 |
 |
 |
 |
 |
 |
 |
 |
|
 |
RTOS :Real Time programming is not the only way to arrive at an Embedded solution.Real Time programming & RTOS do come into picture only when there is a need for the controller to react in a combinational way to events that occur simultaneously. Where tasks are prioritized based on the urgency associated with the event that triggered the task. Consider a process which is completely sequential ( a single event triggering a complete sequence of operations occurring at regular intervals ). Then what is the point in using a RTOS with high scheduling capabilities. In such cases using a RTOS could even dangerously bring down the processing ability of the controller. So any system developer should completely analyse the requisites for the project and then should decide upon using an appropriate Kernel. Example Process :Consider a simple process having two tasks that are mutually exclusive.
From the above diagram we can infer that by using a multitasking kernel we can achieve concurrent execution of tasks. If concurrent execution is required then decision has to be made in favor of RTOS. But in cases where concurrent execution is no needed, then by using a RTOS, you can very well see from the diagram that you gain nothing and loose a lot of time spent by the OS. In such cases it is wise not to use any RTOS. Kernels :
|