let's say i can a task called my_task. If i add a stop action and the beginning of the task:
stop my_task
my_task will stop inmediatly. What i want is, when my_task executes, it should check if it was already executing before, then stop that other instance of itself, and then continue with the rest of the task... Is it possible?
That's what Tasker offers by default: if a task is already running, either the new instance stops immediately (default IIRC) or the already running one gets stopped. Should be in the advanced setting of the task:
Tap the settings button (bottom right in the screenshot) to open this screen, then chose in the drop-down box for "Collision Handling":
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