Hi, working with nimBLE I found that I had an issue when scheduling a callback to be made from within the signal handler for a timer, which was set with SIGEV_THREAD. The issue was that I was pushing to a POSIX queue from within the handler, and it was failing with BADFD. From debugging I realized that when trying to obtain the inode for the queue it was looking up at the open file descriptors from the lpwork thread, which of course would not share open file descriptors with main task.
Since this is working for Linux (I had copied this part of the porting layer from Linux) my reasoning is that SIGEV_THREAD is there implemented as a thread that is a child of the process which registered the signal handler and thus shares the open file descriptors. In NuttX this is implemented via a work queue so this is not the case. Is my reading correct? If so, it may be worth adding this limitation to https://github.com/apache/incubator-nuttx/issues/1352 Best, Matias
