server: Fix the status code for get/set_thread_context on a terminated thread.

dlls/kernel32/tests/thread.c

@@ -955,6 +955,22 @@ static void test_SetThreadContext(void)
 
     WaitForSingleObject( thread, INFINITE );
     ok( test_value == 20, "test_value %d instead of 20\n", test_value );
+
+    ctx.ContextFlags = CONTEXT_FULL;
+    SetLastError(0xdeadbeef);
+    ret = GetThreadContext( thread, &ctx );
+    ok( !ret, "GetThreadContext succeeded\n" );
+    ok( GetLastError() == ERROR_GEN_FAILURE || broken(GetLastError() == ERROR_INVALID_HANDLE), /* win2k */
+        "wrong error %u\n", GetLastError() );
+
+    SetLastError(0xdeadbeef);
+    ret = SetThreadContext( thread, &ctx );
+    ok( !ret, "SetThreadContext succeeded\n" );
+    ok( GetLastError() == ERROR_GEN_FAILURE || GetLastError() == ERROR_ACCESS_DENIED ||
+        broken(GetLastError() == ERROR_INVALID_HANDLE), /* win2k */
+        "wrong error %u\n", GetLastError() );
+
+    CloseHandle( thread );
 }
 
 #endif  /* __i386__ */

server/thread.c

@@ -1493,7 +1493,7 @@ DECL_HANDLER(get_thread_context)
                 suspend_thread( thread );
             }
         }
-        else set_error( STATUS_ACCESS_DENIED );
+        else set_error( STATUS_UNSUCCESSFUL );
     }
     else if ((context = set_reply_data_size( sizeof(context_t) )))
     {
@@ -1535,7 +1535,7 @@ DECL_HANDLER(set_thread_context)
                 suspend_thread( thread );
             }
         }
-        else set_error( STATUS_ACCESS_DENIED );
+        else set_error( STATUS_UNSUCCESSFUL );
     }
     else if (context->cpu == thread->process->cpu)
     {