* adjust TThread.Synchronize so that it also works correctly if the passed in thread instance is not the instance of the current thread

+ added test

git-svn-id: trunk@38124 -

.gitattributes

@@ -11486,6 +11486,7 @@ tests/tbs/tb0632.pp svneol=native#text/pascal
 tests/tbs/tb0633.pp svneol=native#text/pascal
 tests/tbs/tb0634.pp svneol=native#text/pascal
 tests/tbs/tb0635.pp svneol=native#text/pascal
+tests/tbs/tb0636.pp svneol=native#text/pascal
 tests/tbs/tb205.pp svneol=native#text/plain
 tests/tbs/tb610.pp svneol=native#text/pascal
 tests/tbs/tb613.pp svneol=native#text/plain

rtl/objpas/classes/classes.inc

@@ -362,8 +362,18 @@ procedure TThread.DoneSynchronizeEvent;
 class procedure TThread.Synchronize(AThread: TThread; AMethod: TThreadMethod);
   var
     syncentry: PThreadQueueEntry;
+    thread: TThread;
   begin
-    if not Assigned(AThread) then begin
+{$ifdef FPC_HAS_FEATURE_THREADING}
+    if Assigned(AThread) and (AThread.ThreadID = GetCurrentThreadID) then
+{$else}
+    if Assigned(AThread) then
+{$endif}
+      thread := AThread
+    else if Assigned(CurrentThreadVar) then
+      thread := CurrentThreadVar
+    else begin
+      thread := Nil;
       { use a local synchronize event }
       New(syncentry);
       FillChar(syncentry^, SizeOf(TThreadQueueEntry), 0);
@@ -374,11 +384,13 @@ class procedure TThread.Synchronize(AThread: TThread; AMethod: TThreadMethod);
       syncentry^.ThreadID := 0{GetCurrentThreadID};
       syncentry^.SyncEvent := nil{RtlEventCreate};
 {$endif}
-    end else begin
+    end;
-      { the Synchronize event is instantiated on demand }
-      AThread.InitSynchronizeEvent;
 
-      syncentry := AThread.FSynchronizeEntry;
+    if Assigned(thread) then begin
+      { the Synchronize event is instantiated on demand }
+      thread.InitSynchronizeEvent;
+
+      syncentry := thread.FSynchronizeEntry;
     end;
 
     syncentry^.Exception := Nil;
@@ -388,7 +400,7 @@ class procedure TThread.Synchronize(AThread: TThread; AMethod: TThreadMethod);
     syncentry^.Method := Nil;
     syncentry^.Next := Nil;
 
-    if not Assigned(AThread) then begin
+    if not Assigned(thread) then begin
       { clean up again }
 {$ifdef FPC_HAS_FEATURE_THREADING}
       RtlEventDestroy(syncentry^.SyncEvent);

tests/tbs/tb0636.pp

@@ -0,0 +1,129 @@
+program tb0636;
+
+{$mode objfpc}
+
+uses
+{$ifdef unix}
+  cthreads,
+{$endif}
+  Classes, syncobjs;
+
+type
+  TTestThread1 = class(TThread)
+  private
+    fOnNotify: TNotifyEvent;
+  protected
+    procedure Execute; override;
+  public
+    property OnNotify: TNotifyEvent read fOnNotify write fOnNotify;
+  end;
+
+  TTestThread2 = class(TThread)
+  private
+    procedure DoSync;
+    procedure DoSync2;
+  private
+    procedure HandleNotify(aSender: TObject);
+  protected
+    procedure Execute; override;
+  end;
+
+var
+  ev1, ev2: TEvent;
+  sync1, sync2: LongInt;
+
+{ TTestThread2 }
+
+procedure TTestThread2.DoSync;
+begin
+  Inc(sync1);
+  Writeln('main in t2: DoSync');
+end;
+
+procedure TTestThread2.DoSync2;
+begin
+  Inc(sync2);
+  Writeln('main in t2: DoSync2');
+end;
+
+procedure TTestThread2.HandleNotify(aSender: TObject);
+begin
+  Writeln('t1 in t2: Signalling ev1');
+  ev1.SetEvent;
+  Writeln('t1 in t2: Synchronizing DoSync');
+  Synchronize(@DoSync);
+end;
+
+procedure TTestThread2.Execute;
+begin
+  Writeln('t2: Waiting for ev1');
+  ev1.WaitFor(INFINITE);
+  Sleep(100);
+  Writeln('t2: Signalling ev2');
+  ev2.SetEvent;
+  Writeln('t2: Synchronizing DoSync2');
+  Synchronize(@DoSync2);
+  Writeln('t2: Waiting for ev1');
+  ev1.WaitFor(INFINITE);
+  Writeln('t2: Done');
+end;
+
+{ TTestThread1 }
+
+procedure TTestThread1.Execute;
+begin
+  Writeln('t1: Calling fOnNotify');
+  fOnNotify(Self);
+  Writeln('t1: Done');
+end;
+
+var
+  t1: TTestThread1;
+  t2: TTestThread2;
+begin
+  sync1 := 0;
+  sync2 := 0;
+
+  ev1 := Nil;
+  ev2 := Nil;
+  t1 := Nil;
+  t2 := Nil;
+
+  try
+    ev1 := TEvent.Create(Nil, False, False, '');
+    ev2 := TEvent.Create(Nil, False, False, '');
+    t1 := TTestThread1.Create(True);
+    t2 := TTestThread2.Create(True);
+
+    Writeln('main: Starting t2');
+    t2.Start;
+
+    t1.OnNotify := @t2.HandleNotify;
+    Writeln('main: Starting t1');
+    t1.Start;
+
+    Writeln('main: Waiting for ev2');
+    ev2.WaitFor(INFINITE);
+
+    Writeln('main: Calling CheckSynchronize');
+    CheckSynchronize();
+
+    Writeln('main: Signalling ev1');
+    ev1.SetEvent;
+
+    Writeln('main: Waiting for threads');
+    t1.WaitFor;
+    t2.WaitFor;
+
+    Writeln('main: Cleaning up');
+  finally
+    t1.Free;
+    t2.Free;
+    ev1.Free;
+    ev2.Free;
+  end;
+
+  if (sync1 <> 1) or (sync2 <> 1) then
+    Halt(1);
+  Writeln('main: ok');
+end.