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tcl::randomseed(3tcl) Reflected/virtual channel support tcl::randomseed(3tcl)


tcl::randomseed - Utilities for random channels


package require Tcl 8.5

package require TclOO

package require tcl::randomseed ?1?


::tcl::combine seed1 seed2


The tcl::randomseed package provides a a few utility commands to help with the seeding of tcl::chan::random channels.


This command creates returns a list of seed integers suitable as seed argument for random channels. The numbers are derived from the process id, current time, and Tcl random number generator.
::tcl::combine seed1 seed2
This command takes to seed lists and combines them into a single list by XORing them elementwise, modulo 256. If the lists are not of equial length the shorter of the two is padded with 0s before merging.


This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category virtchannel of the Tcllib Trackers []. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.


/dev/random, merge, random, reflected channel, seed, tip 219, virtual channel




Copyright (c) 2009 Andreas Kupries <>
1 tcllib