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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