X-Git-Url: http://www.lcore.org/git/lcore.git/blobdiff_plain/f04d9ac0ffbe96ead372b84dad0786daba7f5ed7..1066f857936e27fbf24d6b96b5be7703a2c0b0bf:/lmessages.pas?ds=sidebyside

diff --git a/lmessages.pas b/lmessages.pas
index db26b38..d6e3745 100755
--- a/lmessages.pas
+++ b/lmessages.pas
@@ -1,9 +1,24 @@
+{ Copyright (C) 2005 Bas Steendijk and Peter Green
+  For conditions of distribution and use, see copyright notice in zlib_license.txt
+  which is included in the package
+  ----------------------------------------------------------------------------- }
+
+//this unit provides a rough approximation of windows messages on linux
+//it is usefull for multithreaded applications on linux to communicate back to
+//the main lcore thread
+//This unit is *nix only, on windows you should use the real thing
+
 unit lmessages;
 //windows messages like system based on lcore tasks
 interface
 
 uses pgtypes,sysutils,bsearchtree,strings,syncobjs;
 
+
+{$if (fpc_version < 2) or ((fpc_version=2) and ((fpc_release < 2) or ((fpc_release = 2) and (fpc_patch < 2)) ))}
+  {$error this code is only supported under fpc 2.2.2 and above due to bugs in the eventobject code in older versions}
+{$endif}
+
 type
   lparam=taddrint;
   wparam=taddrint;
@@ -394,11 +409,15 @@ begin
       //we have to get the window procedure while the structurelock
       //is still held as the window could be destroyed from another thread
       //otherwise.
-      windowproc := window.windowproc;
+      if window <> nil then begin
+        windowproc := window.windowproc;
+      end else begin
+        windowproc := nil;
+      end;
     finally
       structurelock.release;
     end;
-    if window <> nil then begin
+    if windowproc <> nil then begin
       result := windowproc(lpmsg.hwnd,lpmsg.message,lpmsg.wparam,lpmsg.lparam);
     end else begin
       result := -1;