Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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AdvancedSearchThreadWorker.Execute signaled _stopEvent before clearing _pause and before reading the exit condition. Sleep() unblocks the instant that signal fires, so the owning thread can start the next cycle while the worker is still finishing the previous one. Two ways that goes wrong: - Reuse hang. The next cycle's Wake/Push/Sleep writes _pause = true, then the worker's stale `_pause = false` lands on top of it. The inner loop never observes pauseRequested, the queue is already empty, and it spins on Thread.Yield() forever -- so the owning thread's next Sleep() waits on a _stopEvent that is never set again. A single search wakes each worker once, so this only surfaces once the shared pool is reused. - Orphaned Exit. Exit() sets _exit, Wake()s, then Sleep()s, the moment the drain's Sleep() returns. Reading _exit after the signal, the worker can observe that fresh _exit, return without ever consuming the Wake, and leave Exit()'s Sleep() waiting on a signal nobody will send. The IsAlive guard does not close this: the thread passes the check and returns immediately after. Both go away by ordering the handshake the way SerializationThreadWorker already does -- sample the exit condition, clear _pause, then signal. That worker is the reference for this pattern and is protected by its comment alone, which is the precedent followed here. Verified before merge with two throwaway timing tests (25k reuse cycles and 2k drain-then-Exit cycles): both failed against the previous ordering and passed with this one. They are not part of the change. Their reproduction threshold is a property of one machine's scheduler -- at 2k and 200 cycles the buggy build passed -- so as permanent tests they would have cost ~560ms and 2000 thread creations per suite run for a guarantee that may not hold on a CI runner. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> |
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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