sleeping and waking up a user process from the kernel

["Devvrat Tripathi" <tripathidevvrat@xxxxxxxxx>]

How do you make a use process go to sleep and then wake it up again from the kernel. I did this in a module

set_current_state(TASK_INTERRUPTIBLE)
if(condn)
schedule()

and then in some other part of the module
if(cond2)
wake_up_process(the same process)

but when i run the user space process it says segmentation fault. Can anyone explain how to do this. An example will be of great help

regards

devvrat