This is not necessarily the current version of this TIP.This is not necessarily the current version of this TIP.
| TIP: | 178 |
| Title: | [info pid] and [info tid] Subcommands |
| Version: | $Revision: 1.5 $ |
| Author: | Joe Mistachkin <joe at mistachkin dot com> |
| State: | Draft |
| Type: | Project |
| Tcl-Version: | 8.5 |
| Vote: | Pending |
| Created: | Sunday, 21 March 2004 |
This TIP proposes two new info subcommands which are used to obtain the current process and thread identifiers.
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.
It is the opinion of the author that informational commands, such as pid should really be subcommands of info as we start to move forward with the development of Tcl.
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.
A complete implementation of this TIP is available [1].
This document has been placed in the public domain.
This is not necessarily the current version of this TIP.