thread.c: check interrupts explicitly in select/ppoll blocking regions

The logic around blocking_region_begin is confusing to me,
but the goal of this patch is to ensure rb_sigwait_fd_get
and rb_sigwait_fd_put are matched.

In other words, we don't want a thread to hold sigwait_fd
forever if an exception is raised while calling select()
or ppoll().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64550 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

0 files changed, 0 insertions, 0 deletions