On 2012-11-02, at 18:42, Sebastian Nozzi <[email protected]> wrote:
> Hello Dear Squeakers,
>
> threads and co. are giving me headaches :-) I wanted to ask for advice...
>
> What do I use in Squeak to prevent more than one thread entering a region,
> but "releasing" the exclusivity in another block/callback? For example, let's
> suppose there is an hypothetical class "Lock" that does that.
>
> lock acquire.
> longOperation performWhenFinished: [ callback code ... lock release ].
> ...
> rest of the program
> ...
>
> Is there something like that? Or do I have to simulate it with something
> else? (Semaphore?)
You could use a Semaphore directly:
semaphore := Semaphore forMutualExclusion.
and then
semaphore wait "acquire lock"
...
semaphore signal "release lock"
> I am aware or Monitor/Mutex critical:, but I am not sure I can use it in my
> case.
Semaphore>>critical: simply does a wait and signal like above. But it ensures
that if something goes wrong the semaphore is still signaled, so it's more easy
to use.
- Bert -
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