* thread_pthread.c (set_nonblock): new helper function for set O_NONBLOCK. * thread_pthread.c (rb_thread_create_timer_thread): set O_NONBLOCK to timer_thread_pipe[0] too. * thread_pthread.c (consume_communication_pipe): retry when read returned CCP_READ_BUFF_SIZE. * thread_pthread.c (rb_thread_create_timer_thread): factor out creating communication pipe logic into separate function. * thread_pthread.c (setup_communication_pipe): new helper function. * thread_pthread.c (set_nonblock): moves a definition before setup_communication_pipe. * thread_pthread.c (rb_thread_wakeup_timer_thread_fd): add fd argument and remove hardcoded dependency of timer_thread_pipe[1]. * thread_pthread.c (consume_communication_pipe): add fd argument. * thread_pthread.c (close_communication_pipe): ditto. * thread_pthread.c (timer_thread_sleep): adjust the above changes. * thread_pthread.c (setup_communication_pipe_internal): factor out pipe initialize logic. * thread_pthread.c (ARRAY_SIZE): new. * thread_pthread.c (gvl_acquire_common): use low priority notification for avoiding timer thread interval confusion. If we use timer_thread_pipe[1], every gvl_yield() request one more gvl_yield(). It lead to thread starvation. [Bug #7999] [ruby-core:53095] * thread_pthread.c (rb_reserved_fd_p): adds timer_thread_pipe_low to reserved fds. * process.c (setup_communication_pipe): remove unused function. it was unintentionally added r39683.
merge revision(s) 39679,39682,39683,39685,39686,39694: [Backport #7999]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39727 b2dd03c8-39d4-4d8f-98ff-823fe69b080e