2009/03/17 v0.3
* sample.sh : add the PID of the script in the semaphore name to allow to run
  several instances of the script in // and add explaination

2009/03/16 v0.2
* manage some errors messages instead of segfault
* display error message on stdout (for now, will change later)
* replace -lrt by -lpthread by default in Makefile

2009/03/16 v0.1 Initial release
