473,215 Members | 1,306 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,215 software developers and data experts.

What is "shared library" in C, is there any small example I can see?

Confusing th eword with "library", "shared library" and how to use
these things in real C project, is there any small example I can take a
look. Thanks.

Nov 15 '05 #1
2 1991
In article <11**********************@o13g2000cwo.googlegroups .com>,
<sa***********@yahoo.com> wrote:
Confusing th eword with "library", "shared library" and how to use
these things in real C project, is there any small example I can take a
look. Thanks.

The C language itself does not have "library" or "shared library"
or "project". The C standard requires that the implementation provide
a standard set of routines which it calls "the standard library",
but the C standard puts no restriction on how the implementation
does that.

It is -common- for implementations to provide ways of bundling
groups of half-compiled programs, and that those bundles can
be referenced by the linking phase in order to provide access
to the routines and data, but there is a fair variability in
how that is done.

A "shared library" (in common parlance) is just another
library (with system-dependant semantics and invocation
mechanisms). Again the C standard has nothing to say on
the matter.

When a system bothers to distinguish between a "library"
and a "shared library", it might commonly be saying that
only one copy of the "shared library" will be placed in memory
for access by all users and all processes, whereas a library
on such a system that was -not- "shared" would have a copy of
some or all of it placed into each process's address space.

Details of what a "library" or "shared libary" mean on your
system, and how to use them, should be asked about in a newsgroup
appropriate for your system. As I mentioned before, they are not
C concepts as such, and there are important differences between
different systems.
Chocolate is "more than a food but less than a drug" -- RJ Huxtable
Nov 15 '05 #2

<sa***********@yahoo.com> wrote
Confusing th eword with "library", "shared library" and how to use
these things in real C project, is there any small example I can take a
look. Thanks.

Most C implentations allow you to build "libraries" - compiled function
which can be called from user code. The standard library and extensions will
probably come with the compiler as "library" files.

On a big system, exactly what some of these libraries do can be complex. For
instance a sophisticated operating system won't want printf() writing pixels
directly to the screen, it will want facilities for capturing and
redirecting output, changing fonts, providing braile access for blind users,
and so. Also it doesn't make any sense to load a huge system for one "hello
world" program - better have all the code resident in memory.

Exactly what "shared library" menas can differ, however, as Walter pointed
out. It could mean a libary which more than one application links to, it
could mean a library of which only one copy is in memory at any one time, it
could mean a library like the braile printf example which several programs
access simulataneously in a cooperative manner.
Nov 15 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Berthold Hoellmann | last post by:
Hello, When I use ./configure --with-thread --with-fpectl --with-signal-module \ --with-pymalloc --enable-shared --with-cxx=g++ make test on 2.3.3 I get
by: apple | last post by:
UDBV8 fp 6a - AIX 5.1 We have scheduled cron jobs to do backups. Periodically and starting to occur more frequently, a backup fails with this error: SQL2072N Unable to bind the shared library...
by: Jenna Schmidt | last post by:
I know that one of the benefits of using "Shared" methods is you do not explicitly have to Dim as New object to access the method. Are there some other implications with memory and concurrency...
by: David Sanschagrin | last post by:
(I previously posted this problem on vb.general.discussion but I've been told that this question is more related to VB.NET than VB6 and so that I should post that here.) I'm trying to call a...
by: Carsten H. Pedersen | last post by:
Hello I want to create a kind of shared object. I have created a class, Counter, which you can then import. Through the Counter class, i would like to have access to a shared object. Lets say...
by: HmFireBall | last post by:
Hi, This is a question about a shared property in ASP.NET Imagine there's an assembly called my.dll that is in the /bin directory of several websites. This assembly contains a class with a...
by: Kenneth Kahl | last post by:
Hello, I would like to call a C++ programm out of Java with help of JNI. By the followed command I created a "shared library": g++ -shared -o libcalculate.so rechner.cpp When I create an...
by: jbeteta | last post by:
Hello, I have a problem declaring variables. I need to create an object oRpte as ReportClass on WebForm1.aspx and be able to use its value on WebForm2.aspx. For declaring the property oRpte()...
by: amit2781 | last post by:
I am trying to build the my project on HPUX (HP-UX oscar B.11.11 U 9000/800 741028561 unlimited-user license) which access the Mysql library. But it is giving error as : Error :...
by: isladogs | last post by:
The next online meeting of the Access Europe User Group will be on Wednesday 6 Dec 2023 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, Mike...
by: veera ravala | last post by:
ServiceNow is a powerful cloud-based platform that offers a wide range of services to help organizations manage their workflows, operations, and IT services more efficiently. At its core, ServiceNow...
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 3 Jan 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). For other local times, please check World Time Buddy In...
by: jianzs | last post by:
Introduction Cloud-native applications are conventionally identified as those designed and nurtured on cloud infrastructure. Such applications, rooted in cloud technologies, skillfully benefit from...
by: abbasky | last post by:
### Vandf component communication method one: data sharing ​ Vandf components can achieve data exchange through data sharing, state sharing, events, and other methods. Vandf's data exchange method...
by: fareedcanada | last post by:
Hello I am trying to split number on their count. suppose i have 121314151617 (12cnt) then number should be split like 12,13,14,15,16,17 and if 11314151617 (11cnt) then should be split like...
by: stefan129 | last post by:
Hey forum members, I'm exploring options for SSL certificates for multiple domains. Has anyone had experience with multi-domain SSL certificates? Any recommendations on reliable providers or specific...
by: egorbl4 | last post by:
Скачал я git, хотел начать настройку, а там вылезло вот это Что это? Что мне с этим делать? ...
by: MeoLessi9 | last post by:
I have VirtualBox installed on Windows 11 and now I would like to install Kali on a virtual machine. However, on the official website, I see two options: "Installer images" and "Virtual machines"....

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.