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docs/reference/isr_rules.rst: Fix inconsistent variable name in example. 

Fixed to be conistent with the code example above it.
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Luiz Brandao 2022-01-24 10:16:35 -05:00 committed by Damien George
parent 5943a2ec79
commit ddda959e57
1 changed files with 2 additions and 2 deletions
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docs/reference/isr_rules.rst
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@ -339,8 +339,8 @@ A critical section can comprise a single line of code and a single variable. Con
This example illustrates a subtle source of bugs. The line ``count += 1`` in the main loop carries a specific race This example illustrates a subtle source of bugs. The line ``count += 1`` in the main loop carries a specific race
condition hazard known as a read-modify-write. This is a classic cause of bugs in real time systems. In the main loop condition hazard known as a read-modify-write. This is a classic cause of bugs in real time systems. In the main loop
MicroPython reads the value of ``t.counter``, adds 1 to it, and writes it back. On rare occasions the interrupt occurs MicroPython reads the value of ``count``, adds 1 to it, and writes it back. On rare occasions the interrupt occurs
after the read and before the write. The interrupt modifies ``t.counter`` but its change is overwritten by the main after the read and before the write. The interrupt modifies ``count`` but its change is overwritten by the main
loop when the ISR returns. In a real system this could lead to rare, unpredictable failures. loop when the ISR returns. In a real system this could lead to rare, unpredictable failures.
As mentioned above, care should be taken if an instance of a Python built in type is modified in the main code and As mentioned above, care should be taken if an instance of a Python built in type is modified in the main code and