Is the "else" part of orElse
called when a transaction is retried due to another transaction writing to a TVar
it had read, or only when retry
is explicitly called?
Haskell: TVar: orElse
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If you have
then
b
is only run ifretry
is called explicitly ina
. OtherwiseorElse
would essentially become nondeterministic. (The rerunning of transactions that is done by the STM runtime is transparent and should not effect the outcome of any computation.)