patacongo edited a comment on pull request #3626:
URL: https://github.com/apache/incubator-nuttx/pull/3626#issuecomment-829332834


   > And, now os call the pthread_cleanup from user space in pthread_exit, but 
in pthread_cancel they are still called from kernel side, we still need to move 
cancellation point in syscall to user space.
   
   Our messages are crossing each other in time.  I just pointed that out too.  
Cancellation is a problem and also logic in the default signal actions.
   
   Thanks for working on this.  I think this is important for the long term 
health of the OS but I have not been motivated to work on it very much do to 
health reasons.  I appreciate that you are taking this on.  It really is an 
interesting project.  There are a couple of related issues that might also 
interest you in Issues #1263 and #1265
   


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