From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/ext/tk/README.fork | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 jni/ruby/ext/tk/README.fork

(limited to 'jni/ruby/ext/tk/README.fork')

diff --git a/jni/ruby/ext/tk/README.fork b/jni/ruby/ext/tk/README.fork
new file mode 100644
index 0000000..c58d758
--- /dev/null
+++ b/jni/ruby/ext/tk/README.fork
@@ -0,0 +1,34 @@
+Ruby/Tk does NOT support forking the process on which Tk interpreter
+is running (unless NEVER control Tk interpreter under the forked child
+process). In the library 'tk.rb', a Tk interpreter is initialized.
+Therefore, if you want running Tk under a child process, please call
+"require 'tk'" in the child process.
+
+# If do fork and exec(<new Ruby/Tk>) on the child process, you can
+# control Ruby/Tk interpreter on the child process by 'send' command
+# of Tcl/Tk. About this, please see Tk.appsend and Tk.rb_appsend, or
+# 'remote-tk.rb' and the sample 'sample/remote-ip_sample.rb'.
+
+For example, the following sample1 will NOT work, and sample2 will
+work properly.
+
+---<sample1: NOT work>---------------------------------------
+require 'tk'  ## init Tk interpreter under parent process
+
+exit! if fork ## exit parent process
+
+## child process
+TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
+Tk.mainloop
+-------------------------------------------------------------
+
+---<sample2: will work>--------------------------------------
+exit! if fork ## exit main process
+
+## child process
+require 'tk'  ## init Tk interpreter under child process
+TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
+Tk.mainloop
+-------------------------------------------------------------
+
+                                         2004/05/22  Hidetoshi NAGAI
-- 
cgit v1.2.3