worker processes: new processes would be spawned while the pool is being
shut down.  Patch by Charles-François Natali.

Eventually I'll actually replace the calls in the tests themselves.

and on OS X with pydebug.

is passed (previously, a select.error with EINVAL would be raised).  Patch
by Charles-François Natali.

Mac OS X and FreeBSD to reduce the chances of a crash instead of a
"maximum recursion depth" RuntimeError exception.
(Patch by Ronald Oussoren)

Patch by Nadeem Vawda.

interrupted (EINTR), for example if the program is stopped with CTRL+z on Mac
OS X. Patch written by Charles-Francois Natali.

interrupted (EINTR), for example if the program is stopped with CTRL+z on Mac
OS X. Patch written by Charles-Francois Natali.

(EINTR), for example if the program is stopped with CTRL+z on Mac OS X. Patch
written by Charles-Francois Natali.

faulthandler.enable(all_threads=True) dumps the tracebacks even if it is not
possible to get the state of the current thread

Create also the get_thread_state() subfunction to factorize the code.

The comment was already correct.

 * Write a new test to ensure that dump_tracebacks_later() still works if
   it was already called and then cancelled before
 * Don't use a variable to check the status of the thread, only rely on locks
 * The thread only releases cancel_event if it was able to acquire it (if
   the timer was interrupted)
 * The main thread always hold this lock. It is only released when
   faulthandler_thread() is interrupted until this thread exits, or at Python
   exit.

Fix a crash: don't read from NULL.

Not a complete fix for this issue.

Not a complete fix for this issue.

Not a complete fix for this issue.