Asynchronous functions

[gamehack]

Hello all,

I've been wondering lately how would I go about writing async
functions. What I thought of is basically using a queue and when the
function is called, it justs enqueues the call. Then the actual
function which does the work checks the queue every now and then and
processes the elements. But how am I going to schedule the functions
to check the queue? Is this going to be dependent on the underlying
platform? I've tried to google around to find any pointers on
strategies how to implement async functions and didn't find any. Any
pointers are greatly appreciated.

Regards

[Ico]

Re: Asynchronous functions

gamehack <gamehack@gmail .com> wrote:
[color=blue]
> I've been wondering lately how would I go about writing async
> functions. What I thought of is basically using a queue and when the
> function is called, it justs enqueues the call. Then the actual
> function which does the work checks the queue every now and then and
> processes the elements. But how am I going to schedule the functions
> to check the queue? Is this going to be dependent on the underlying
> platform? I've tried to google around to find any pointers on
> strategies how to implement async functions and didn't find any. Any
> pointers are greatly appreciated.[/color]

If you want to stick to standard C, I'm afraid you will have to poll the
queue every now and then.

If your platform supports threads and basic synchronisation mechanisms,
using a separate thread for handling the queue would be the way to go.
Using platform-specific interfaces makes this subject off-topic in this
newsgroup, unfortunately.

--
:wq
^X^Cy^K^X^C^C^C ^C

[gamehack]

Re: Asynchronous functions

As I want to stick to standard C, is there a way to "you will have to
poll the queue every now and then." ?

Thanks


Ico wrote:[color=blue]
> gamehack <gamehack@gmail .com> wrote:
>[color=green]
> > I've been wondering lately how would I go about writing async
> > functions. What I thought of is basically using a queue and when the
> > function is called, it justs enqueues the call. Then the actual
> > function which does the work checks the queue every now and then and
> > processes the elements. But how am I going to schedule the functions
> > to check the queue? Is this going to be dependent on the underlying
> > platform? I've tried to google around to find any pointers on
> > strategies how to implement async functions and didn't find any. Any
> > pointers are greatly appreciated.[/color]
>
> If you want to stick to standard C, I'm afraid you will have to poll the
> queue every now and then.
>
> If your platform supports threads and basic synchronisation mechanisms,
> using a separate thread for handling the queue would be the way to go.
> Using platform-specific interfaces makes this subject off-topic in this
> newsgroup, unfortunately.
>
> --
> :wq
> ^X^Cy^K^X^C^C^C ^C[/color]

[Ico]

Re: Asynchronous functions

gamehack <gamehack@gmail .com> wrote:
[color=blue]
> Ico wrote:[color=green]
>> gamehack <gamehack@gmail .com> wrote:
>>[color=darkred]
>> > I've been wondering lately how would I go about writing async
>> > functions. What I thought of is basically using a queue and when the
>> > function is called, it justs enqueues the call. Then the actual
>> > function which does the work checks the queue every now and then and
>> > processes the elements. But how am I going to schedule the functions
>> > to check the queue? Is this going to be dependent on the underlying
>> > platform? I've tried to google around to find any pointers on
>> > strategies how to implement async functions and didn't find any. Any
>> > pointers are greatly appreciated.[/color]
>>
>> If you want to stick to standard C, I'm afraid you will have to poll the
>> queue every now and then.
>>
>> If your platform supports threads and basic synchronisation mechanisms,
>> using a separate thread for handling the queue would be the way to go.
>> Using platform-specific interfaces makes this subject off-topic in this
>> newsgroup, unfortunately.
>>[/color]
> As I want to stick to standard C, is there a way to "you will have to
> poll the queue every now and then." ?[/color]

Supposing you have a function that checks if there are requests waiting
in the the queue and calls one or more of the functions, you will just
have to call this function at regular intervals. If your program has
some kind of main event loop, somewhere withing this loop would be a
good place. The best choice depends on your program flow, and is
something only you can decide.



--
:wq
^X^Cy^K^X^C^C^C ^C

[Nils O. Selåsdal]

Re: Asynchronous functions

gamehack wrote:[color=blue]
> As I want to stick to standard C, is there a way to "you will have to
> poll the queue every now and then." ?[/color]
You have to insert calls such as
run_my_queue();
At different points in your code, where run_my_queue()
goes through the queue, executes the operations, and returns
when all is done..