I am thinking about how to write programs like this:
lock1.Lock()
err = performOperation1()
if err != nil {
lock1.Unlock()
return err
}
lock1.Unlock()
performExpensiveOperation2()
The lock1 must be locked while performing operation1, and I need to use its
result to perform operation2. Since operation2 is expensive, I don't want
to hold the lock while performing it, and lock1.Unlock() needs to be called
before calling operation2.
Go's defer mechanism doesn't seem to handle this case well since the
resource is used only within a block and not throughout the function. Is
there a recommended way to write programs in this case?
I know I could wrap the lock block in a closure, but that creates a
completely new scope, so I can't return directly or break out of a loop
within the closure, etc.
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