Queuing multiple task_struct structures?

I would like to queue up multiple struct task_structs in my block device driver. Here, each task_struct would correspond to a userlevel thread which uses the ioctl() system call to send a userspace buffer to my block device driver. Once I queue up multiple task_structs, I would like to keep them on the queue until a开发者_运维问答 particular condition is met (i.e., the buffer has been written down to the disk).

So, my question is, how do I queue up multiple task_structs, put them to sleep, and then wake a subset of the queued task_structs when some condition is met?

You can call kthread_create as many times as you want to create new threads, and then call wake_up on whatever subset of threads you want.