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In computing, a channel is a model for interprocess communication and synchronization via message passing. A message may be sent over a channel, and another process or thread is able to receive messages sent over a channel it has a reference to, as a stream. Different implementations of channels may be buffered or not, and either synchronous or ...
In computer science, a channel system is a finite-state machine similar to communicating finite-state machine in which there is a single system communicating with itself instead of many systems communicating with each other. A channel system is similar to a pushdown automaton where a queue is used instead of a
In IBM mainframe operating systems, Execute Channel Program (EXCP) is a macro generating a system call, implemented as a Supervisor Call instruction, for low-level device access, where the programmer is responsible for providing a channel program—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices.
On system architectures that implement channel I/O, typically all devices are connected by channels, and so all I/O requires the use of CCWs. CCWs are organized into channel programs by the operating system, and I/O subroutine, a utility program, or by standalone software (such as test and diagnostic programs). A limited "branching" capability ...
Xsan file system uses several logical stores to distribute information. The two main classes of information appear on Xsan: the user data (such as files) and the file system metadata (such as folders, file names, file allocation information and so on). Most configurations use different stores for data and metadata.
OpenHarmony Distributed File System (HMDFS) used for Huawei's HarmonyOS with HarmonyOS NEXT base and OpenHarmony-based operating systems, alongside openEuler server OS that is a cross-device file access where devices can read and edit files on transparently when the two devices are connected to the same network with Access token manager ...
A channel program consists of a sequence of Channel Control Words (CCWs) chained together (see below.) Normally the channel fetches CCWs from consecutive doublewords, but a control unit can direct the channel to skip a CCW and a Transfer In Channel (TIC) CCW can direct the channel to start fetching CCWs from a new location.
The native file systems of Unix-like systems also support arbitrary directory hierarchies, as do, Apple's Hierarchical File System and its successor HFS+ in classic Mac OS, the FAT file system in MS-DOS 2.0 and later versions of MS-DOS and in Microsoft Windows, the NTFS file system in the Windows NT family of operating systems, and the ODS-2 ...