[Haskell-cafe] ANN: io-memoize 1.1

Dan Burton danburton.email at gmail.com
Fri Jun 13 17:43:04 UTC 2014

Sorry I wasn't clear about that. The lock is not global, it is per cache.
newCache creates a newMVar which serves as the thread safe lock for that

Concurrently fetching from different caches can indeed run their separate
fallbacks concurrently.

On Fri, Jun 13, 2014, 10:16 AM, Peter Simons <simons at cryp.to> wrote:

> Hi Dan,
>  > 1. Create an empty cache with newCache
>  > 2. fetch repeatedly from the cache, each time providing a fallback in
>  >    case it is empty.
>  >
>  > Fetching from a Cache is thread safe: only one "fallback" will execute
>  > at a time, and after the first successful fallback, the cached value
>  > will be set and no other fallbacks will be called.
> I'm not sure whether I get this correctly. If multiple threads fetch
> values from one cache, will only one of those threads run at a time? Or
> will those that fetch pairwise different values still run concurrently?
> In other words, does the cache have a global lock or is there a lock per
> value?
> Best regards,
> Peter
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