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[tlaplus] how to improve concurrency of process

each Label is an atomic action.

but in general programming language, each _expression_/statement concurrency with other thread.

so, how to express fine-grain atomic action unit in PlusCal ?

for example in a CAS style while loop. each statement/_expression_ is concurrency with other thread:

while(!lock.get() && lock.compareAndSet(false, true)) {
// do action 1
// do action 2
// ...

I want each one is atomic (concurrency unit). 

add a label to each statement/_expression_ will be very tedious.

can any cleaner manner ?

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