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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 DEBIAN

ares_library_cleanup

ARES_LIBRARY_CLEANUP(3) 				     Library Functions Manual					   ARES_LIBRARY_CLEANUP(3)

NAME

       ares_library_cleanup - c-ares library deinitialization

SYNOPSIS

       #include <ares.h>

       void ares_library_cleanup(void)

       cc file.c -lcares

DESCRIPTION

       The  ares_library_cleanup function uninitializes the c-ares library, freeing all resources previously acquired by ares_library_init(3) when
       the library was initialized.

       This function must be called when the program using c-ares  will  no  longer  need  any	c-ares	function.  Once  the  program  has  called
       ares_library_cleanup(3) it shall not make any further call to any c-ares function.

       This function does not cancel any pending c-ares lookups or requests previously done. Program  must use ares_cancel(3) for this purpose.

       This  function is not thread safe.  You have to call it once the program is about to terminate, but this call must be done once the program
       has terminated every single thread that it could have initiated. This is required to avoid potential race conditions in library	deinitial-
       ization,  and also due to the fact that ares_library_cleanup(3) might call functions from other libraries that are thread unsafe, and could
       conflict with any other thread that is already using these other libraries.

       Win32/64 application DLLs shall not call ares_library_cleanup(3) from the DllMain function. Doing so will produce deadlocks and other prob-
       lems.

AVAILABILITY

       This function was first introduced in c-ares version 1.7.0 along with the definition of preprocessor symbol CARES_HAVE_ARES_LIBRARY_CLEANUP
       as an indication of the availability of this function.

       Since the introduction of this function, it is absolutely mandatory to call it for any Win32/64 program using c-ares.

       Non-Win32/64 systems can still use c-ares version 1.7.0 without calling ares_library_cleanup(3) due to the fact that currently it is nearly
       a do-nothing function on non-Win32/64 platforms.

SEE ALSO

       ares_library_init(3), ares_cancel(3)

AUTHOR

       Yang Tse

       Copyright 1998 by the Massachusetts Institute of Technology.
       Copyright (C) 2004-2009 by Daniel Stenberg.

								    19 May 2009 					   ARES_LIBRARY_CLEANUP(3)
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