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Full Discussion: In unix how we can test or check race condition in c program by using multi threads
Top Forums Programming In unix how we can test or check race condition in c program by using multi threads Post 302292199 by redoubtable on Friday 27th of February 2009 05:58:00 AM
Old 02-27-2009
Quote:
Originally Posted by afroze
Thans 4 ur concern

My actual problem is below one. And iam not getting any idea please help me in this
" Developing a script to detect race conditions in a given library or code using multi-thread programming "
Script to detect race conditions in a given library or code? So you want something that will load the library or disassemble the library and search for possible race conditions? You also want that script to analyze plain code for race conditions? This is FAR from being simple. I'll post the possible solutions:

1) use some program (example: objdump) to disassemble the whole library and simply use regex to search for unsafe calls/interrupts.

2) load/use the library (dlopen/dlsym/dlclose) in thread1 and use thread2 to analyze calls for open() with ptrace() to check if there is any possible race condition.

3) Why is multi-threading an issue? Is this homework?
 

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LEARN ABOUT MOJAVE

dlclose

DLCLOSE(3)						   BSD Library Functions Manual 						DLCLOSE(3)

NAME

     dlclose -- close a dynamic library or bundle

SYNOPSIS

     #include <dlfcn.h>

     int
     dlclose(void* handle);

DESCRIPTION

     dlclose() releases a reference to the dynamic library or bundle referenced by handle.  If the reference count drops to 0, the bundle is
     removed from the address space, and handle is rendered invalid.  Just before removing a dynamic library or bundle in this way, any termina-
     tion routines in it are called.  handle is the value returned by a previous call to dlopen.

     Prior to Mac OS X 10.5, only bundles could be unloaded.  Starting in Mac OS X 10.5, dynamic libraries may also be unloaded.  There are a cou-
     ple of cases in which a dynamic library will never be unloaded: 1) the main executable links against it, 2) An API that does not supoort
     unloading (e.g. NSAddImage()) was used to load it or some other dynnamic library that depends on it, 3) the dynamic library is in dyld's
     shared cache.

RETURN VALUES

     If dlclose() is successful, it returns a value of 0.  Otherwise it returns -1, and sets an error string that can be retrived with dlerror().

SEE ALSO

     dlopen(3) dlsym(3) dlerror(3) dyld(3) ld(1) cc(1)

								    Nov 6, 2006
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