Re: Help with callbacks

--- In [email protected], Roger Corman <roger@c...> wrote:
> 
> >This is probably it then as both the timer and the thread 
callback 
> >fail (The thread callback is definitely called from a foreign 
> >thread). 
 
> Lisp code can only be executed by threads which are known by the
> lisp system. The reason is that garbage collection can be 
> triggered at any time, by any thread. If this happens, only 
> threads known to the garbage collector get scanned. If any lisp 
> code is running on a thread not known to the collector, it will 
> not be properly updated, which is usually fatal to that thread.

> If you have a native DLL (compiled in C or C++, for example) you 
> can put code in the DllMain function which calls BlessThread() 
> whenever a new thread is instantiated. 

:)

Can you tell how happy I am ? It works!!! Thanks Roger and Chris. 
Calling BlessThread() within DLL_THREAD_ATTACH did the trick.

HMODULE module = LoadLibrary("CormanLispServer.dll");
char* funcName;
FuncPtr func;

switch (ul_reason_for_call) {
...
	case DLL_THREAD_ATTACH:
		funcName = "BlessThread";
		func = (FuncPtr)GetProcAddress(module, funcName);
		func();
		break;
	case DLL_THREAD_DETACH:
		funcName = "UnblessThread";
		func = (FuncPtr)GetProcAddress(module, funcName);
		func();
		break;
...}

Thanks again for all your help/time guys :) 

(I sure hope someone else uses this library in addition to me.)

-Luke


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