thread.c (rb_wait_for_single_fd): do not leak EINTR on timeout

We must not leak EINTR to users in case a signal hits a
ppoll/select caller right when (or just before) the timeout
expires.  In other words, the timeout should take precedence
over the -1 result from ppoll or select.

We also try one more time in case of EINTR with a zero timeout,
since technically the syscall finished before timing out if
it returns EINTR.

Regression appeared in r62457
("thread.c (update_timespec): use timespec_update_expire",
 commit e6bf0128add103730d8c96727f3ed4dab95088e4)
and is not in any stable release of Ruby.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

0 files changed, 0 insertions, 0 deletions