Show examples of C code that explicitly do a read-modify-write operation on SAMD21 I/O pin PA02 to set this bit in a PORT register, clear it in a PORT register, and toggle it in a PORT register. You may assume it has already been initialized as an output. If possible, show an example of code that implicitly does a read-modify-write operation on this pin.

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Race Condition

A race condition occurs within a critical section when two or more tasks try to access and alter a shared resource simultaneously. As a consequence, the process changes to a state of inconsistency.