Re: Re: Help with callbacks

Something to note:
Lisp code may never be called on a thread that the lisp system does not know about. If it is being called on a previously unknown thread it will definitely be a problem.  You could use BlessThread() to initialize a foreign-allocated thread for Lisp usage.

The callbacks have definitely been used with multiple arguments. Chris's suggestion about declarations matching up (:pascal vs. :c conventions) is a good one. Check that, because it may cause a problem to show up with differing numbers of arguments.

Roger

At 05:15 AM 6/11/2003 +0000, you wrote:
>--- In [email protected], "Chris Double" 
><chris.double@d...> wrote:
>> On Wed, 11 Jun 2003 02:09:43 -0000, "smallhairytroll"
>> <lcluke@h...> said:
>> > Good idea, unfortunately it still crashes. (I didn't bother 
>calling 
>> > SDL_PushEvent as it still crashes returning only interval.)
>> 
>> Two more things to try. What happens if you call SDL_AddTimer with 
>the
>> following:
>> 
>> (setf a-timer-1 (SDL_AddTimer 
>>         500 
>>         (ct:get-callback-procinst 'my-timer-func-1)
>>         (ct:int-to-foreign-ptr 0)))
>> 
>
>Hi Chris,
>
>Thanks for all your feedback, it is very much appreciated.
>
>The above code either locks up CCL completely, or abrubtly 
>terminates the environment. The previous crashes brought up the 
>Windows dialog that asks to send details of the crash to Microsoft. 
>Not so with this code.
>
>I have already tried using ct:defun-c-callback and ct:defun-callback 
>for C and Pascal calling convertions respectively. No difference.
>
>Multiple timers require multiple threads and each timer is added to 
>the Windows message queue using the Windows function: timeSetEvent
>
>"The timeSetEvent function starts a specified timer event. The 
>multimedia timer runs in its own thread. After the event is 
>activated, it calls the specified callback function or sets or 
>pulses the specified event object"
>
>The callback function is HandleAlarm, which in turn calls 
>SDL_ThreadedTimerCheck. This is the function that fires the Lisp 
>callback function.
>
>-Luke
>
>
>
>
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> 
>
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