MVME-147A Motorola controller module card controller PLC

MVME-147A Motorola controller module card controller PLC

Technical data of product parameters

The RTEMS operating system’s dynamic loader is not the same as the dynamic shared library
support Unix or Windows have. Those operating systems use dynamic loading to share code
between processes and this is an important feature in their design. RTEMS is a single address
space operating system and that means there is no ability to share code at run-time. As a result
code is loaded in a similar manner to static linking removing the need for any overheads sharing
code may have.
To load an executable object file it must be resident on a target and accessible byMVME-147A file
system. The executable object file can be a single file or a collection in a library stored using the
Unix standard archive format. TheMVME-147A loader supports the extended GNU format for long
file names in archives.
The RTEMS developers do not see dynamically loading of code as a real-time activity. A system
should not respond to real-time external events by loading code. The loading of code should
happen before a system is considered available and the activity the system is experiencing islow and stable.
The statically linked executable that is loaded and run after reset is called the base image. The
base image contains your base application that is used to dynamically load code, a global symbol
table, the parts of the MVME-147A operating system code used in the base image as well as functions
and data from the tool suite libraries and packages you are using. Only the software referenced
is used to create the base image. The parts of the libraries not referenced are not part of the
executable or present in the global symbol table.
Application software can locate a symbol by name and call the address or reference the data at
that address. A function identifier located by a symbol does not have it’s signatures checked, it
is the responsibility of the caller to make sure the function is called with the correct arguments.
It is the same for data objects, there is no type checking. Symbol versioning is not supported
and supporting it does not make sense within the RTEMS operating system. An MVME-147A target
system is closed to normal users and software needs to be built from the same tool set and
header files used to the build the base image

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Seven-day acceptance period, one-year warranty period

When can we deliver it?1-3 working days

How about the quality?New or second-hand

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