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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

ibv_ud_pingpong

IBV_UD_PINGPONG(1)						   USER COMMANDS						IBV_UD_PINGPONG(1)

NAME

       ibv_ud_pingpong - simple InfiniBand UD transport test

SYNOPSIS

       ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e] HOSTNAME

       ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e]

DESCRIPTION

       Run a simple ping-pong test over InfiniBand via the unreliable datagram (UD) transport.

OPTIONS

       -p, --port=PORT
	      use TCP port PORT for initial synchronization (default 18515)

       -d, --ib-dev=DEVICE
	      use IB device DEVICE (default first device found)

       -i, --ib-port=PORT
	      use IB port PORT (default port 1)

       -s, --size=SIZE
	      ping-pong messages of size SIZE (default 2048)

       -r, --rx-depth=DEPTH
	      post DEPTH receives at a time (default 500)

       -n, --iters=ITERS
	      perform ITERS message exchanges (default 1000)

       -l, --sl=SL
	      send messages with service level SL (default 0)

       -e, --events
	      sleep while waiting for work completion events (default is to poll for completions)

SEE ALSO

       ibv_rc_pingpong(1), ibv_uc_pingpong(1), ibv_srq_pingpong(1)

AUTHORS

       Roland Dreier
	      <rolandd@cisco.com>

BUGS

       The  network  synchronization between client and server instances is weak, and does not prevent incompatible options from being used on the
       two instances.  The method used for retrieving work completions is not strictly correct, and race conditions may  cause	failures  on  some
       systems.

libibverbs							  August 30, 2005						IBV_UD_PINGPONG(1)
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