f3527bedf2
The conhost v2 rewrite from a decade ago introduced a race condition: Previously, we would acquire and hold the global console lock while servicing a console API call. If the call cannot be completed a wait task is enqueued, while the lock is held. The v2 rewrite then split the project up into a "server" and "host" component (which remain to this day). The "host" would hold the console lock, while the "server" was responsible for enqueueing wait tasks _outside of the console lock_. Without any form of synchronization, any operations on the waiter list would then of course introduce a race condition. In conhost this primarily meant keyboard/mouse input, because that runs on the separate Win32 window thread. For Windows Terminal it primarily meant the VT input thread. I do not know why this issue is so extremely noticeable specifically when we respond to DSC CPR requests, but I'm also not surprised: I suspect that the overall performance issues that conhost had for a long time, meant that most things it did were slower than allocating the wait task. Now that both conhost and Windows Terminal became orders of magnitudes faster over the last few years, it probably just so happens that the DSC CPR request takes almost exactly as many cycles to complete as allocating the wait task does, hence perfectly reproducing the race condition. There's also a slight chance that this is actually a regression from my ConPTY rewrite #17510, but I fail to see what that would be. Regardless of that, I'm 100% certain though, that this is a bug that has existed in v0.1. Closes #18117 Closes #18800 ## Validation Steps Performed * See repro in #18800. In other words: * Continuously emit DSC CPR sequences * ...read the response from stdin * ...and print the response to stdout * Doesn't deadlock randomly anymore ✅ * Feature & Unit tests ✅ (cherry picked from commit 29924217615d58940d8309bec49476fa9dd2fb6b) Service-Card-Id: PVTI_lADOAF3p4s4AxadtzgZiUlo Service-Version: 1.23
Welcome to the Windows Terminal, Console and Command-Line repo
Table of Contents
This repository contains the source code for:
- Windows Terminal
- Windows Terminal Preview
- The Windows console host (
conhost.exe) - Components shared between the two projects
- ColorTool
- Sample projects that show how to consume the Windows Console APIs
Related repositories include:
- Windows Terminal Documentation (Repo: Contribute to the docs)
- Console API Documentation
- Cascadia Code Font
Installing and running Windows Terminal
Note
Windows Terminal requires Windows 10 2004 (build 19041) or later
Microsoft Store [Recommended]
Install the Windows Terminal from the Microsoft Store. This allows you to always be on the latest version when we release new builds with automatic upgrades.
This is our preferred method.
Other install methods
Via GitHub
For users who are unable to install Windows Terminal from the Microsoft Store, released builds can be manually downloaded from this repository's Releases page.
Download the Microsoft.WindowsTerminal_<versionNumber>.msixbundle file from
the Assets section. To install the app, you can simply double-click on the
.msixbundle file, and the app installer should automatically run. If that
fails for any reason, you can try the following command at a PowerShell prompt:
# NOTE: If you are using PowerShell 7+, please run
# Import-Module Appx -UseWindowsPowerShell
# before using Add-AppxPackage.
Add-AppxPackage Microsoft.WindowsTerminal_<versionNumber>.msixbundle
Note
If you install Terminal manually:
- You may need to install the VC++ v14 Desktop Framework Package. This should only be necessary on older builds of Windows 10 and only if you get an error about missing framework packages.
- Terminal will not auto-update when new builds are released so you will need to regularly install the latest Terminal release to receive all the latest fixes and improvements!
Via Windows Package Manager CLI (aka winget)
winget users can download and install
the latest Terminal release by installing the Microsoft.WindowsTerminal
package:
winget install --id Microsoft.WindowsTerminal -e
Note
Dependency support is available in WinGet version 1.6.2631 or later. To install the Terminal stable release 1.18 or later, please make sure you have the updated version of the WinGet client.
Via Chocolatey (unofficial)
Chocolatey users can download and install the latest
Terminal release by installing the microsoft-windows-terminal package:
choco install microsoft-windows-terminal
To upgrade Windows Terminal using Chocolatey, run the following:
choco upgrade microsoft-windows-terminal
If you have any issues when installing/upgrading the package please go to the Windows Terminal package page and follow the Chocolatey triage process
Via Scoop (unofficial)
Scoop users can download and install the latest Terminal
release by installing the windows-terminal package:
scoop bucket add extras
scoop install windows-terminal
To update Windows Terminal using Scoop, run the following:
scoop update windows-terminal
If you have any issues when installing/updating the package, please search for or report the same on the issues page of Scoop Extras bucket repository.
Installing Windows Terminal Canary
Windows Terminal Canary is a nightly build of Windows Terminal. This build has the latest code from our main branch, giving you an opportunity to try features before they make it to Windows Terminal Preview.
Windows Terminal Canary is our least stable offering, so you may discover bugs before we have had a chance to find them.
Windows Terminal Canary is available as an App Installer distribution and a Portable ZIP distribution.
The App Installer distribution supports automatic updates. Due to platform limitations, this installer only works on Windows 11.
The Portable ZIP distribution is a portable application. It will not automatically update and will not automatically check for updates. This portable ZIP distribution works on Windows 10 (19041+) and Windows 11.
| Distribution | Architecture | Link |
|---|---|---|
| App Installer | x64, arm64, x86 | download |
| Portable ZIP | x64 | download |
| Portable ZIP | ARM64 | download |
| Portable ZIP | x86 | download |
Learn more about the types of Windows Terminal distributions.
Windows Terminal Roadmap
The plan for the Windows Terminal is described here and will be updated as the project proceeds.
Terminal & Console Overview
Please take a few minutes to review the overview below before diving into the code:
Windows Terminal
Windows Terminal is a new, modern, feature-rich, productive terminal application for command-line users. It includes many of the features most frequently requested by the Windows command-line community including support for tabs, rich text, globalization, configurability, theming & styling, and more.
The Terminal will also need to meet our goals and measures to ensure it remains fast and efficient, and doesn't consume vast amounts of memory or power.
The Windows Console Host
The Windows Console host, conhost.exe, is Windows' original command-line user
experience. It also hosts Windows' command-line infrastructure and the Windows
Console API server, input engine, rendering engine, user preferences, etc. The
console host code in this repository is the actual source from which the
conhost.exe in Windows itself is built.
Since taking ownership of the Windows command-line in 2014, the team added several new features to the Console, including background transparency, line-based selection, support for ANSI / Virtual Terminal sequences, 24-bit color, a Pseudoconsole ("ConPTY"), and more.
However, because Windows Console's primary goal is to maintain backward compatibility, we have been unable to add many of the features the community (and the team) have been wanting for the last several years including tabs, unicode text, and emoji.
These limitations led us to create the new Windows Terminal.
You can read more about the evolution of the command-line in general, and the Windows command-line specifically in this accompanying series of blog posts on the Command-Line team's blog.
Shared Components
While overhauling Windows Console, we modernized its codebase considerably, cleanly separating logical entities into modules and classes, introduced some key extensibility points, replaced several old, home-grown collections and containers with safer, more efficient STL containers, and made the code simpler and safer by using Microsoft's Windows Implementation Libraries - WIL.
This overhaul resulted in several of Console's key components being available for re-use in any terminal implementation on Windows. These components include a new DirectWrite-based text layout and rendering engine, a text buffer capable of storing both UTF-16 and UTF-8, a VT parser/emitter, and more.
Creating the new Windows Terminal
When we started planning the new Windows Terminal application, we explored and evaluated several approaches and technology stacks. We ultimately decided that our goals would be best met by continuing our investment in our C++ codebase, which would allow us to reuse several of the aforementioned modernized components in both the existing Console and the new Terminal. Further, we realized that this would allow us to build much of the Terminal's core itself as a reusable UI control that others can incorporate into their own applications.
The result of this work is contained within this repo and delivered as the Windows Terminal application you can download from the Microsoft Store, or directly from this repo's releases.
Resources
For more information about Windows Terminal, you may find some of these resources useful and interesting:
- Command-Line Blog
- Command-Line Backgrounder Blog Series
- Windows Terminal Launch: Terminal "Sizzle Video"
- Windows Terminal Launch: Build 2019 Session
- Run As Radio: Show 645 - Windows Terminal with Richard Turner
- Azure Devops Podcast: Episode 54 - Kayla Cinnamon and Rich Turner on DevOps on the Windows Terminal
- Microsoft Ignite 2019 Session: The Modern Windows Command Line: Windows Terminal - BRK3321
FAQ
I built and ran the new Terminal, but it looks just like the old console
Cause: You're launching the incorrect solution in Visual Studio.
Solution: Make sure you're building & deploying the CascadiaPackage project in
Visual Studio.
Note
OpenConsole.exeis just a locally-builtconhost.exe, the classic Windows Console that hosts Windows' command-line infrastructure. OpenConsole is used by Windows Terminal to connect to and communicate with command-line applications (via ConPty).
Documentation
All project documentation is located at aka.ms/terminal-docs. If you would like to contribute to the documentation, please submit a pull request on the Windows Terminal Documentation repo.
Contributing
We are excited to work alongside you, our amazing community, to build and enhance Windows Terminal!
BEFORE you start work on a feature/fix, please read & follow our Contributor's Guide to help avoid any wasted or duplicate effort.
Communicating with the Team
The easiest way to communicate with the team is via GitHub issues.
Please file new issues, feature requests and suggestions, but DO search for similar open/closed preexisting issues before creating a new issue.
If you would like to ask a question that you feel doesn't warrant an issue (yet), please reach out to us via Twitter:
- Christopher Nguyen, Product Manager: @nguyen_dows
- Dustin Howett, Engineering Lead: @dhowett
- Mike Griese, Senior Developer: @zadjii@mastodon.social
- Carlos Zamora, Developer: @cazamor_msft
- Pankaj Bhojwani, Developer
- Leonard Hecker, Developer: @LeonardHecker
Developer Guidance
Prerequisites
- You must be running Windows 10 2004 (build >= 10.0.19041.0) or later to run Windows Terminal
- You must enable Developer Mode in the Windows Settings app to locally install and run Windows Terminal
- You must have PowerShell 7 or later installed
- You must have the Windows 11 (10.0.22621.0) SDK installed
- You must have at least VS 2022 installed
- You must install the following Workloads via the VS Installer. Note: Opening
the solution in VS 2022 will prompt you to install missing components
automatically:
- Desktop Development with C++
- Universal Windows Platform Development
- The following Individual Components
- C++ (v143) Universal Windows Platform Tools
- You must install the .NET Framework Targeting Pack to build test projects
Building the Code
OpenConsole.sln may be built from within Visual Studio or from the command-line using a set of convenience scripts & tools in the /tools directory:
Building in PowerShell
Import-Module .\tools\OpenConsole.psm1
Set-MsBuildDevEnvironment
Invoke-OpenConsoleBuild
Building in Cmd
.\tools\razzle.cmd
bcz
Running & Debugging
To debug the Windows Terminal in VS, right click on CascadiaPackage (in the
Solution Explorer) and go to properties. In the Debug menu, change "Application
process" and "Background task process" to "Native Only".
You should then be able to build & debug the Terminal project by hitting F5. Make sure to select either the "x64" or the "x86" platform - the Terminal doesn't build for "Any Cpu" (because the Terminal is a C++ application, not a C# one).
👉 You will not be able to launch the Terminal directly by running the WindowsTerminal.exe. For more details on why, see #926, #4043
Coding Guidance
Please review these brief docs below about our coding practices.
👉 If you find something missing from these docs, feel free to contribute to any of our documentation files anywhere in the repository (or write some new ones!)
This is a work in progress as we learn what we'll need to provide people in order to be effective contributors to our project.
- Coding Style
- Code Organization
- Exceptions in our legacy codebase
- Helpful smart pointers and macros for interfacing with Windows in WIL
Code of Conduct
This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.