Missing ReactOS Functionality

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This page contains a list of APIs, COM interfaces, drivers, application, extensions or other functionality that Windows has but ReactOS does not. There are other similar pages in this wiki that might help, e.g. Version Status and Roadmap. This page is intended as a list of general tasks that need to be done in ReactOS. If a certain component already exists, consider filing a bug report.

Statuses: planned, implementation started, implementation finished.

General

  • Boot from non-primary/logical/secondary partition; Boot from some primary partitions
  • Automatic Updates
  • Search [1]
  • User Login
  • WMI [2]
  • Diskpart [3] (command line partitioning tool)
  • Disk Defragmenter (ROSAPPS-332) [4]
  • Use Event Tracing [5] (turn debug channels into event channels??)
  • Hibernation support
  • LSASS [6]
  • Multi user support
  • Multi session support
  • Fast User Switching
  • LDAP/ActiveDirectory [7]
  • Task Scheduler
  • Printing
  • HTML Applications [8] – HTML files with a .hta extension that run as Windows Applications using the MSHTML (IE) Engine – see CORE-12813
  • Animated Mouse Cursors (CORE-14166)
  • Security Support Provider Interface (and the MS provided default packages) [9]
  • NTFS
  • WOWEXEC to run older Windows applications, based on 16 bit code. (A partial implementation of NTVDM exists. Aside: There are no "free" compilers for 16bit Windows NE style code as of 2018).

Win32 features

Introduced in Windows NT

  • NT-based CHKDSK [13]
  • Dr. Watson [i]

Introduced in Windows 98

  • System File Checker [14] (nice, but not absolutely needed)

Introduced in Windows ME

Introduced in Windows 2000

Introduced in Windows XP

  • Image Mastering API (needed for many cd writing applications)
  • Window ghosting(A window manager feature that lets the user minimize, move, or close the main window of an application that is not responding) – see CORE-11944
  • System Optional Components Manager (sysocmgr.exe)
  • Error Reporting [19] (Would be tremendously helpful to development) (CORE-8269)
  • MUI Support [20] (An alternative is worked on by Stefan Fulea- see CORE-10335)
  • Application Compatibility [21] [i]
  • Background Intelligent Transfer Service (BITS) [22] (optional, stuff that would be nice to have)
  • VirtualWiFi architecture [23]

Introduced in Windows Vista

  • User Interface Privilege Isolation (UIPI) see: ChangeWindowMessageFilter
  • User Account Control (UAC) [24]
  • Component-Based Servicing (CBS) [25] and [26]
  • Windows optional component setup tool (Ocsetup.exe) [27]
  • Package Manager (Pkgmgr.exe) [28]
  • Address Space Layout Randomization (ASLR). See Techwiki:KASLR. [29]
  • Condition Variables (CORE-7546) [30]
  • One Time Initialization [31]
  • ThreadPool API [32]
  • Wait Chain Traversal [33]
  • Desktop Window Manager [34]
  • Windows Search [35]

Introduced in Windows 7

  • New API Functions [i] [36]
  • Deployment Image Servicing and Management (DISM) [37]
  • Jump Lists [38]
  • Pin to Taskbar [39]
  • Window Snapping [40]
  • Wallpaper Rotation [41]
  • Multi-touch Support [42] (optional)
  • exFAT (Extended File Allocation Table) [43]
  • DPI settings are per-user [44]
  • Wireless Hosted Network [45]

Introduced in Windows 8

  • Supervisor Mode Execution Prevention [46]
  • Windows To Go [47] (ReactOS has LiveCDs instead)

Introduced in Windows 10

  • APPX packaging for desktop apps

Kernel features

NT 5.1

  • Keyed events
  • Push locks
  • The Prefetcher
  • The Driver Verifier

NT 5.2

  • Data Execution Prevention (NX) (Implemented for x64, requires PAE on x86, which isn't supported yet)
  • Kernel Patch Protection (PatchGuard)
  • Threaded DPCs

NT 6.0

  • ALPC
  • I/O prioritization
  • Integrity levels
  • Kernel Transaction Manager
  • Low-Fragmentation Heap
  • Memory priorities
  • NUMA-aware memory management
  • Private namespaces
  • Processor Power Manager
  • Protected Processes
  • ReadyBoost
  • ReadyBoot
  • SuperFetch
  • BCD (Boot Configuration Database)
  • Uses Time Stamp Counter to track CPU cycles during thread runtime (cycle-based scheduling)
  • Windows Diagnostics Infrastructure (WDI)
  • Windows Hardware Error Architecture (WHEA)

NT 6.1

  • Affinity enumeration
  • Processor Power Management
  • Dynamic Fair Share Scheduler
  • Interrupt affinity
  • Multiple system working sets
  • New enhanced kernel timer environment (high-resolution, finite, idle-resilient, no-wake)
  • Processor groups and group affinity
  • Removal of the global dispatcher lock
  • Removal of the global PFN lock
  • Timer coalescing
  • User‐Mode Scheduling

NT 6.2

  • Boot/Bugcheck Graphics
  • Cache-aware push locks
  • Direct quantum donations
  • Fast Startup
  • Group scheduling
  • Job hierarchies
  • Modern Boot
  • Memory combining
  • NX kernel memory pools
  • Object-less waiting by thread ID
  • Power management framework (PoFx)
  • Hybrid ready queues
  • Swap the entire process working set (new swap file)
  • Windows Notification Facility (WNF)

NT 6.3

  • Auto Boost (which in modern Windows is used in many synchronization primitives, e.g. push locks, guarded/fast mutexes, executive resources, many internal component locks etc.)
  • CFG
  • Connected (Modern) Standby
  • Interrupt steering
  • Kernel Shim Engine
  • Lightweight thread suspension (no APC)
  • Major handle table refactoring
  • Protected Process Light
  • Registry hives defragmentation (reorganization)

NT 10

  • Auto-expand push locks
  • Cache-aware scheduling
  • CET
  • CFG (Kernel)
  • Core isolation
  • CPU sets
  • DIF
  • DPC Delegates and DPCs runtime history
  • DPC wait events
  • DTrace
  • Dynamic timer tick
  • Processor enclaves
  • Fanned-out push locks
  • Heterogeneous processor power management
  • Heterogeneous scheduling
  • I/O QoS
  • I/O Ring
  • KASAN (Kernel Address Sanitizer)
  • Latency-aware scheduling
  • Memory partitions
  • MicroVM
  • Minimal and Pico Processes
  • Priority queue kernel object
  • Registry hives defragmentation (reorganization)
  • Section-backed registry
  • Segment heap
  • Special user-mode APCs
  • Store Manager (memory compression)
  • Time zone virtualization
  • Trustlets (Secure Processes)
  • Virtualization-Based Security, Secure Kernel, Isolated User Mode
  • VP threads scheduling
  • VReg (registry virtualization)
  • Windows containers

Multiprocessing

Multiple processors are not supported at this time. Even if the PC has multiple processors or multiple cores, ReactOS will use only one core.

However, ReactOS can perform multiprocessing to allow many processes (programs) to run concurrently.

In GSoC 2021 student Justin Miller planning to complete Symmetric Multiprocessing (SMP).

Drivers

Display

Networking

  • Internet Protocol Version 6 [52]
  • DHCP Server
  • SMB Filesystem Server/Client [53]
  • NFS Server/Client [54]
  • Tunnel (P-t-P) Network Communication

Low Priority Framework implementations

  • MFC and Visual C support runtimes...
  • Visual Basic Runtime
  • .NET alternative such as Mono
  • Windows Runtime
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