Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
6f74532280
Two defects in CrowdSecReporter shutdown, both reachable only on a shard that actually has CrowdSec configured with items still queued. 1. FlushRemainingOnStop blocked with GetAwaiter().GetResult() on a ValueTask. Beyond being unsupported in general -- an IValueTaskSource-backed ValueTask does not wait there, it throws -- it hung. Stop() runs on the main thread, where Main installs EventLoopContext as SynchronizationContext.Current, and nothing in CrowdSecAlertClient used ConfigureAwait(false), so the send's continuation was posted to a queue only LoopContext.ExecuteTasks() drains -- and by HandleClosed() the loop has stopped ticking. The thread waited on a continuation only that thread could run. The 3s budget did not help: it completes the HTTP call, not the resumption. Run the flush through Task.Run so the whole chain lives on the pool with no context to capture, block once on a real Task, and bound it with Wait so a wedged send costs a few seconds of shutdown rather than the process. Add ConfigureAwait(false) across the client and drain loop per rule #10 so the pool hop is defense in depth rather than the only thing holding it up. 2. Start() did Task.Run(() => DrainLoop(...)) where DrainLoop returned ValueTask. There is no Task.Run(Func<ValueTask>) overload, so it bound to Task.Run<TResult>(Func<TResult>) and produced a Task<ValueTask> that completes at the first suspending await, not when the loop exits -- silently upcast by the Task _drainTask field. Stop()'s drain-exited handshake was therefore a no-op (Wait returned true in ~0ms), letting the flush read a SingleReader channel concurrently with a live drain loop, which is precisely the hazard that handshake documents itself as preventing. It also made the loop fire-and-forget and swallowed any fault escaping it. Return Task so it binds to Task.Run(Func<Task>) and unwraps. A loop awaited once has nothing to gain from ValueTask. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> |
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| LICENSE | ||
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ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team