The Tcl Core

The Tcl core is the C implementation of Tcl. It is managed and maintained by the Tcl Core Team.

Resources (alternatively core and )
official fossil source code repository and bug tracker
Github mirror of Tcl/Tk and related code
previous project site for the development of Tcl. Although the old source code repository, mailing lists, and bug tracker remain there for historical purposes, they are no longer updated.


Previously, development code was hosted in a CVS repository at


An allocator that returns memory to the system and attempts to remain free of lock contention.

See Also

Getting Started With Working On The Tcl/Tk Core
Hacking on The Core
Tips, Tools, Techniques.
Quality of source code
Tcl Core - Is All
Tcl Core Architecture
tcl core subsystems
Category Internals
An automated index of pages categorized as related to the Tcl internals.
Tcl Functional Areas
An overview on the Tcl Core wiki of the functional areas of Tcl.
Tcl Core Wiki Contents
a list of pages on that wiki.

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