[LAD] Writing to an eventfd from a realtime thread

Paul Davis paul at linuxaudiosystems.com
Wed Sep 24 22:46:04 UTC 2014

On Wed, Sep 24, 2014 at 6:15 PM, karthik poduval <karthik.poduval at gmail.com>

> You could also use a jack_rigbuffer_t, its lock free and hence should be
> RT thread safe.
> You could write a known msg into the ring buffer from the RT thread,
> receive the msg from non real-time thread and do event passing from there.

Nope. the poster is looking for a way to notify a different thread that it
would be worth checking out the contents of a ringbuffer.

There are only two ways to do this: either wake the other thread regularly
based on a timer, and hope that the chosen interval and accuracy are enough
to keep the buffer (empty|full) OR wake the other thread as needed. this
second option requires some sort of communication channel to the thread to
wake it, which could be (on linux) any of a pthread_condvar, a semaphore, a
FIFO/pipe, and eventfd, etc. etc.
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