[fpc-pascal] QueueUserAPC Similar Cross platform Functionality

[Andrew Brunner]

Hi there,

I've got a unit I'm porting from Windows to Linux and I came across a
QueueUserAPC (Kernel32 Windows) I make to add a callback method that
gets executed by the thread I added this to.

function QueueUserAPC(Callback: Pointer; hThread: THandle;
dwData:DWORD): boolean; stdcall;

When the Thread gets around to it, it processes the callback function
I passed in during the queue call.

Judging by the performance of this method I would say that the Windows
Kernel maintains a queue of events to process for each thread.  And
this function allows me to attach a callback to that queue so I can
allocate memory within that stack rather than the stack of the calling
thread.  This feature is important as I want to keep memory allocation
to specific threads.

Does Threading under Linux have anything like this?  Have any of you
done anything like this under *nix?

Thanks for any feedback.