| Joe Mistachkin 2004-03-27, 12:27 am |
|
TIP #178: [INFO PID] AND [INFO TID] SUBCOMMANDS
========================================
=========
Version: $Revision: 1.1 $
Author: Joe Mistachkin <joe_at_mistachkin.com>
State: Draft
Type: Project
Tcl-Version: 8.5
Vote: Pending
Created: Sunday, 21 March 2004
URL: http://purl.org/tcl/tip/178.html
WebEdit: http://purl.org/tcl/tip/edit/178
Post-History:
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ABSTRACT
==========
This TIP proposes two new [info] subcommands which are used to obtain
the current process and thread identifiers.
RATIONALE
===========
In certain types of applications, it is important to know what thread
is currently executing. This is especially true for multithreaded
applications or for scripts running in a threaded build of Tcl.
While the author realizes that there is already a [pid] command, the
addition of the [info pid] subcommand still makes sense for the
following reasons:
* The [pid] command can also provide information totally unrelated
to the /current/ process identifier. At one point ([TIP #88]) it
was even suggested that the [pid] command be overloaded to
provide process control related functionality.
* To allow scripts that dynamically build other scripts
(potentially for use with safe interpreters) using the [info]
command and caller provided arguments. Using the [info] command
instead of the [pid] command limits the amount of information
that can be obtained by the safe interpreter.
PROPOSED CHANGE
=================
Two new subcommands, [info pid] and [info tid], would be added to the
[info] command with the following syntax:
*info pid*
This subcommand would return the process identifier for the current
process.
*info tid*
This subcommand would return the thread identifier for the current
thread.
DRAFT IMPLMENTATION
=====================
A complete implementation of this TIP is availble at:
<URL:http://sf.net/tracker/?func=detail&...894&atid=310894>
COPYRIGHT
===========
This document has been placed in the public domain.
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