Wind River Glossary


Wind River Technical Glossary

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S

static library

 

An archive of object files. The linker can use libraries, and the objects they contain, during linkage to resolve unresolved references. Static libraries are compiled and linked directly into an application.

Because they are linked in their entirety, static libraries provide all of their functionality to the application and, unlike shared libraries, do not need to be distributed separately from an executable. However, the entire executable must be replaced when a static library is upgraded; also, using static libraries may waste space if the executable is including unneeded routines or data.

See also shared library.

status

 

See "state".

stf interface

 

An stf interface is a 6to4 tunnel interface that can tunnel IPv6 traffic over IPv4, as specified in RFC3056. For ordinary nodes in 6to4 site, you do not need stf interface. The stf interface is necessary for site border router (called "6to4 router" in the specification). See also gif interface.

subscribe

 

To subscribe to an event means to indicate that you want to be informed when an event is raised.

subscription

 

The mechanism to acquire source data item's data from a Source Server. This depends on the type of the Source Server COM or XML, and on the DA specification is supports. Subscribing to the data is supported by callbacks in COM DA, and by the Subscribe services in SML DA. Wind River OPC DX servers support subscribing to DA servers that implement the OPC Foundation's DA 2.04 and2.05a specifications.

Supplicant

 

An entity that requests access to the LAN.

suspend

 

To suspend a device is to put it into an inactive state to conserve power. For example, the host may suspend a device for a specific period when it observes that there is no traffic on the bus. While suspended, the USB device maintains its internal status, including its address and configuration.

SVGA

 

Super Video Graphics Adapter

symbol, symbol reference

 

An identifier in an object file (often in a symbol table) that refers to a data structure in a source file, such as a function or a variable. Every access to a variable or function becomes a so-called symbol reference. If the symbol and the reference are defined in the same compilation unit (e.g., a C file), the reference is said to be resolved. If the symbol is defined in another compilation unit, the reference is unresolved (because the compiler always only sees a single unit at a time) and the linker will have to resolve it. See also object file.

synchronous

 

When a process sends a message and then waits for a reply before continuing, or calls a function and waits for the function to complete its processing and return before continuing, these are said to besynchronous messages or synchronous function calls.


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