I don’t see anything suboptimal about the first one.
Defer is a function-scope magic thing.
Go designers chose not to have lexical scope magic, so you would either
force function scope (prior answer) or be happy with the normal code.
On Fri, Feb 8, 2019 at 10:31 AM Burak Serdar <bser...@ieee.org> wrote:
> On Fri, Feb 8, 2019 at 11:28 AM vincent163 <hwy1415...@gmail.com> wrote:
> >
> > I am thinking about how to write programs like this:
> > lock1.Lock()
> > err = performOperation1()
> > if err != nil {
> > lock1.Unlock()
> > return err
> > }
> > lock1.Unlock()
> > performExpensiveOperation2()
>
> How about this:
>
> lock1.Lock()
> err = performOperation1()
> lock1.Unlock()
> if err != nil {
> return err
> }
> 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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--
*Michael T. jonesmichael.jo...@gmail.com <michael.jo...@gmail.com>*
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