the release of version ReactOS 0.4.11. This version has seen substantial work done to the kernel, helping improve overall system stability.
While the term kernel is used as a sort of catch-all term, in truth the range of functionality that it encapsulates is quite wide. One case in point is the kernel’s responsibility for managing file I/O. A mistake here can cause subtle data corruption to more obvious hard crashes. Pierre Schweitzer’s fixes to the cache controller’s management of its data structures has removed at least one source of blue screens that occurred when attempting to backup a disk’s partition using the ODIN backup software.
Storage improvements were something of a theme in kernel improvements this time around, as work was also done on the filesystems ReactOS supports. While the fastfat driver is an inhouse filesystem driver, ReactOS has always relied on a third party driver for BTRFS support. This reliance however feeds back, as problems ReactOS discover in our usage of the driver can be sent back upstream to help improve it further. Such was the case with a major memory leak problem that Thomas Faber was able to track down.
And speaking of storage, the very interfaces that allows operating systems to talk with storage devices has undergone considerable change since the good old days of IDE and parallel connectors. These days most computers make use of SATA connections and the corresponding AHCI interface, support for which ReactOS relies upon the UniATA driver for. When the 6th generation of Intel’s Core processors (Skylake) was released, it was accompanied by a chipset platform whose AHCI SATA controllers proved incompatible with UniATA. This incompatibility has now been resolved by Alexander Telyatnikov, allowing users wishing to test ReactOS on more modern platforms to better make use of those platforms’ capabilities.
When an application is run, it often depends upon other libraries in the form of DLLs. The loader (LDR) is responsible for finding and loading the respective dependent DLLs, and correctly iterating over these dependencies is fundamental to getting anything to run. One manner of specifying these dependencies is with the use of something called manifests, which was not properly supported in ReactOS. Considering that many modern applications make use of manifests, this was a very glaring hole. Mark Jansen’s work in the runup to 0.4.11 has however added sufficient support for manifests that the range of applications now able to start in ReactOS has significantly widened. Some examples of the newly enabled applications include Blender 2.57b, shown in the screenshot below, Bumptop, Evernote 5.8.3, Quicktime Player 7.7.9, and many others that users have the opportunity to discover for themselves.
Blender 2.57b running within ReactOS
Stopping an application correctly is often just as important from a system stability perspective, as it is when a program is stopped that its previously allocated resources are freed up. For a long time ReactOS had particular difficulty when it came to dealing with the shutdown sequence for .NET 2.0. applications, often times not waiting long enough for these applications to properly exit. Work by Giannis Adamopoulos has however resolved this particular problem, adding further to ReactOS’ usefulness as a platform to run Windows compatible applications.
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