Testing Multi Threaded program on linux

Hello all,

Currently we are developing a multi threaded application in C on linux
platform. For our application we have designed a wrapper on pthread
library. Now I need some free testing tool/suite or technique to test
that application. i have found  some testing tools for Java and C#.
But Still I don't get any tools for C on linux platform. Can anyone
give information/link about free testing tools or techniques which may
help me to test our application and find out Problems, for example:
race condition, dead lock etc that can be raised any time???

Thanks and regrads
Nasif