Thanks, I'll add a comment on that issue for reference.
On Tue, Jan 26, 2021, at 20:12, Gregory Nutt wrote: > Yes, you are right. Perhaps this could be added to > https://github.com/apache/incubator-nuttx/issues/1352 > > That is a different issue description but might still be a good location > because both issues have the same solution. The solution to both issues > is to enhance the OS by adding a new OS facility to start a pthread from > within OS just as if pthread_create() were called from that application > task. That is not really that difficult. The SIGEV_THREAD logic would > then run on that pthread. > > This same facility is also needed to correct the implementation of the > AIO APIs. They also should run on pthreads as well. However, I am not > aware of any functional shortcoming of the current AIO implementation > that would justify the change. > > The only unattractive thing about this solution is that is does require > more resources and is less efficient in general. > > Greg > > On 1/26/2021 4:26 PM, Matias N. wrote: > > 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 >
