* lazy thread initialization support

git-svn-id: trunk@47308 -
(cherry picked from commit c64429cdd0)

rtl/beos/bethreads.pp

@@ -168,6 +168,8 @@ Uses
            pthread_key_create(@TLSKey,nil);
            InitThreadVars(@CRelocateThreadvar);
 {$endif HASTHREADVAR}
+          { lazy initialize thread support }
+           LazyInitThreading;
            IsMultiThread:=true;
          end;
         { the only way to pass data to the newly created thread

rtl/inc/thread.inc

@@ -342,6 +342,34 @@ begin
   currenttm.RTLEventWaitForTimeout(state,timeout);
 end;
 
+{ ---------------------------------------------------------------------
+    lazy thread initialization support
+  ---------------------------------------------------------------------}
+
+var
+  LazyInitThreadingProcs : array of TProcedure = nil;
+procedure RegisterLazyInitThreadingProc(const proc: TProcedure);
+begin
+  if IsMultiThread then
+    begin
+    { multithreading is already enabled - execute directly }
+    proc();
+    end
+  else
+    begin
+    SetLength(LazyInitThreadingProcs,Length(LazyInitThreadingProcs)+1);
+    LazyInitThreadingProcs[high(LazyInitThreadingProcs)]:=proc;
+    end;
+end;
+
+procedure LazyInitThreading;
+var
+  i: Integer;
+begin
+  for i:=0 to high(LazyInitThreadingProcs) do
+    LazyInitThreadingProcs[i]();
+end;
+
 { ---------------------------------------------------------------------
     ThreadManager which gives run-time error. Use if no thread support.
   ---------------------------------------------------------------------}

rtl/inc/threadh.inc

@@ -182,3 +182,7 @@ procedure RTLEventResetEvent(state:pRTLEvent);
 procedure RTLEventWaitFor(state:pRTLEvent);
 procedure RTLEventWaitFor(state:pRTLEvent;timeout : longint);
 
+{ lazy thread initialization support }
+procedure RegisterLazyInitThreadingProc(const proc: TProcedure);
+{ do not call LazyInitThreading directly}
+procedure LazyInitThreading;

rtl/netware/systhrd.inc

@@ -156,6 +156,8 @@ function SysBeginThread(sa : Pointer;stacksize : SizeUInt;
      if not IsMultiThread then
      begin
        InitThreadVars(@SysRelocateThreadvar);
+      { lazy initialize thread support }
+       LazyInitThreading;
        IsMultithread:=true;
      end;
      { the only way to pass data to the newly created thread }

rtl/netwlibc/systhrd.inc

@@ -133,6 +133,8 @@
           { We're still running in single thread mode, setup the TLS }
            pthread_key_create(@TLSKey,nil);
            InitThreadVars(@SysRelocateThreadvar);
+          { lazy initialize thread support }
+           LazyInitThreading;
            IsMultiThread:=true;
          end;
         { the only way to pass data to the newly created thread

rtl/unix/cthreads.pp

@@ -351,7 +351,12 @@ Type  PINTRTLEvent = ^TINTRTLEvent;
       { Initialize multithreading if not done }
       if not TLSInitialized then
         InitCTLS;
-      IsMultiThread:=true;
+      if not IsMultiThread then
+        begin
+          { We're still running in single thread mode, lazy initialize thread support }
+           LazyInitThreading;
+           IsMultiThread:=true;
+        end;
 
       { the only way to pass data to the newly created thread
         in a MT safe way, is to use the heap }

rtl/win/systhrd.inc

@@ -256,7 +256,12 @@ var
 {$endif DEBUG_MT}
         { Initialize multithreading if not done }
         SysInitTLS;
-        IsMultiThread:=true;
+        if not IsMultiThread then
+          begin
+           { lazy initialize thread support }
+            LazyInitThreading;
+            IsMultiThread:=true;
+          end;
 
         { the only way to pass data to the newly created thread
           in a MT safe way, is to use the heap }