Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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Execute() signaled _stopEvent before clearing _pause and before checking the exit flag. Wake/Sleep/Exit all run on the owning thread, so the moment _stopEvent is set the owner can start another pause cycle - Exit() does exactly that. Two interleavings in that window are fatal: - The worker's late "_pause = false" clobbers the new cycle's pause request, so the worker consumes the wake and spins forever waiting for a pause that never reads true while the owner blocks in Sleep(). - The worker's late exit check observes the _exit flag written by an Exit() whose Sleep() is still pending, and returns without ever signaling it. Either way the run hangs silently. The ordering predates this branch, but production callers never sat inside the window (one Wake/Sleep pair per save, minutes apart; Exit only long after the last handshake). The tests added on this branch are the first callers that run pause cycles back-to-back, and a saturated CI runner hit the window: this is what stalled the CentOS job for 2h41m. The race is not rare under that pattern - a churn test reproduces the deadlock in 4 out of 4 runs locally. Fix: sample the exit condition and clear _pause (volatile) BEFORE signaling _stopEvent. A post-signal Exit() is then always serviced by one more wake/drain/signal round, and its pause request can no longer be clobbered. Drain-before-exit semantics on Core.Closing are unchanged. Adds a watchdog churn regression test (2000 wake/sleep/exit lifecycles) that fails instead of hanging if the race is reintroduced: red 4/4 deadlocks without the fix, green 4/4 at ~550ms with it. Server.Tests 789/789 and UOContent.Tests 509/509 pass. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
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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