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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 302291240 by redoubtable on Wednesday 25th of February 2009 04:05:50 AM
Old 02-25-2009
How are you creating the race condition?

You can easily prevent race conditions by creating a temporary file and using rename() to replace the file after checking the timestamp of the original file.

If only your program is changing the file, you can also use flock(fd, LOCK_EX) so that if another instance of your program also uses flock() it will block until the other instance finishes processing or calls flock(fd, LOCK_UN).

Keep in mind that flock() doesn't prevent file unlink()ing.
 

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LEARN ABOUT CENTOS

tchmttest

TCHMTTEST(1)							   Tokyo Cabinet						      TCHMTTEST(1)

NAME

       tchmttest - test cases of the hash database API

DESCRIPTION

       The command `tchmttest' is a utility for facility test under multi-thread situation.  This command is used in the following format.  `path'
       specifies the path of a database file.  `tnum' specifies the number of running threads.	`rnum' specifies the number of iterations.  `bnum'
       specifies the number of buckets.  `apow' specifies the power of the alignment.  `fpow' specifies the power of the free block pool.

	      tchmttest write [-tl] [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-as] [-rnd] path tnum rnum [bnum [apow [fpow]]]
		     Store records with keys of 8 bytes.  They change as `00000001', `00000002'...
	      tchmttest read [-rc num] [-xm num] [-df num] [-nl|-nb] [-wb] [-rnd] path tnum
		     Retrieve all records of the database above.
	      tchmttest remove [-rc num] [-xm num] [-df num] [-nl|-nb] [-rnd] path tnum
		     Remove all records of the database above.
	      tchmttest wicked [-tl] [-td|-tb|-tt|-tx] [-nl|-nb] [-nc] path tnum rnum
		     Perform updating operations selected at random.
	      tchmttest typical [-tl] [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-nc] [-rr num] path tnum rnum [bnum [apow [fpow]]
		     Perform typical operations selected at random.
	      tchmttest race [-tl] [-td|-tb|-tt|-tx] [-xm num] [-df num] [-nl|-nb] path tnum rnum [bnum [apow [fpow]]
		     Perform race condition test.

       Options feature the following.

	      -tl : enable the option `HDBTLARGE'.
	      -td : enable the option `HDBTDEFLATE'.
	      -tb : enable the option `HDBTBZIP'.
	      -tt : enable the option `HDBTTCBS'.
	      -tx : enable the option `HDBTEXCODEC'.
	      -rc num : specify the number of cached records.
	      -xm num : specify the size of the extra mapped memory.
	      -df num : specify the unit step number of auto defragmentation.
	      -nl : enable the option `HDBNOLCK'.
	      -nb : enable the option `HDBLCKNB'.
	      -as : use the function `tchdbputasync' instead of `tchdbput'.
	      -rnd : select keys at random.
	      -wb : use the function `tchdbget3' instead of `tchdbget'.
	      -nc : omit the comparison test.
	      -rr num : specify the ratio of reading operation by percentage.

       This command returns 0 on success, another on failure.

SEE ALSO

       tchtest(1), tchmgr(1), tchdb(3), tokyocabinet(3)

Man Page							    2012-08-18							      TCHMTTEST(1)
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