Static objects in libraries


 
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Old 11-16-2004
Static objects in libraries

Hi!

I have the following problem with C++ programs on Unix:

There is a binary executable program called, e.g. Main. It is dynamically linked with two shared libraries: Shared1 and Shared2. Both of these libraries, in turn, are statically linked with a static library called Static. This static library has a static object called StaticObj declared and defined as:

Code:
class MyClass
{
    public:
        static MyClass StaticObj;
};

MyClass MyClass::StaticObj;

Now, when I run the execucable Main, I get into the problem that StaticObj is initialized twice. This means that MyClass constructor is called twice on the same address. The same story happens with the destructors.

It is naturally that such behaviour would not be desired, especially when you deal with some objects that have states. Neither is applicable variant, which makes two independed copies of StaticObj for libraries Shared1 and Shared2 (imagine that StaticObj is a mutex!).

Has anyone run across a similar problem and found a good solution?

Thanks!
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PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME
pldd - display dynamic shared objects linked into a process SYNOPSIS
pldd PID pldd OPTION DESCRIPTION
The pldd command displays a list of the dynamic shared objects that are linked into the process with the specified process ID. The list includes the libraries that have been dynamically loaded using dlopen(3). OPTIONS
-?, --help Display program help message. --usage Display a short usage message. -V, --version Display the program version. VERSIONS
pldd is available since glibc 2.15. CONFORMING TO
The pldd command is not specified by POSIX.1. Some other systems have a similar command. EXIT STATUS
On success, pldd exits with the status 0. If the specified process does not exist, the user does not have permission to access its dynamic shared object list, or no command-line arguments are supplied, pldd exists with a status of 1. If given an invalid option, it exits with the status 64. EXAMPLE
$ echo $$ # Display PID of shell 1143 $ pldd $$ # Display DSOs linked into the shell 1143: /usr/bin/bash linux-vdso.so.1 /lib64/libtinfo.so.5 /lib64/libdl.so.2 /lib64/libc.so.6 /lib64/ld-linux-x86-64.so.2 /lib64/libnss_files.so.2 NOTES
The command lsof -p PID also shows output that includes the dynamic shared objects that are linked into a process. SEE ALSO
ldd(1), lsof(1), dlopen(3), ld.so(8) GNU
2014-09-27 PLDD(1)