From: Eric Wong <normalperson@...>
Date: 2017-05-19T04:34:44+00:00
Subject: [ruby-core:81244] Re: [ruby-cvs:65407] normal:r58236 (trunk): thread.c: comments on M:N threading [ci skip]
Work-in-progress patch:
https://80x24.org/spew/20170519042738.7174-1-e@80x24.org/raw
Currently, IO scheduling seems to work, waitpid/sleep/other scheduling
is not done, yet; but we do not need to support everything at
once during dev.
main API:
Fiber#start -> enable auto-scheduling and run Fiber until it
automatically yields (due to EAGAIN/EWOULDBLOCK)
The following behave like their Thread counterparts:
Fiber#join - run internal scheduler until Fiber is terminated
Fiber#value - ditto
Fiber#run (in prelude.rb)
Fiber.start (ditto)
I think we can iron out the internal APIs and behavior, first,
and gradually add support for auto-Fiber.yield points.
Right now, it takes over rb_wait_for_single_fd() function
if the running Fiber is auto-enabled (cont.c::rb_fiber_auto_sched_p)
Changes to existing functions are minimal.
New files (important structs and relations should be documented):
iom.h - internal API for the rest of RubyVM (incomplete?)
iom_common.h - common stuff internal to iom_*.h
iom_select.h - select()-specific pieces
Changes to existing data structures:
rb_thread_t.afhead - list of fibers to auto-resume
rb_fiber_t.afnode - link to th->afhead
rb_vm_t.iom - Ruby I/O Manager (rb_iom_t) :)
Besides rb_iom_t, all the new structs are stack-only and
relies extensively on ccan/list for O(1) insert/delete.
Right now, I reuse some static functions in thread.c,
so thread.c includes iom_select.h
TODO:
Hijack other blocking functions (waitpid, IO.select, ...)
iom_epoll.h + iom_kqueue.h (easy once iom.h definitions are done)
I am using "double" for timeout since it is more convenient for
arithmetic like parts of thread.c. Most platforms have good FP,
I think. Also, all "blocking" functions (rb_iom_wait*) will
have timeout support
git repo info:
The following changes since commit c26a9a733848a0696976bb98abfe623e15ba2979:
Fix strange indentation (2017-05-18 15:13:30 +0000)
are available in the git repository at:
git://80x24.org/ruby.git iom_select
for you to fetch changes up to 8ee92fbc908fe67f52372443a1492fc490431de0:
auto fiber scheduling and friends (VERY LIGHTLY TESTED) (2017-05-19 03:51:28 +0000)
----------------------------------------------------------------
Eric Wong (1):
auto fiber scheduling and friends (VERY LIGHTLY TESTED)
common.mk | 3 +
configure.in | 2 +-
cont.c | 156 +++++++++++++++++++-
include/ruby/io.h | 2 +
iom.h | 82 +++++++++++
iom_common.h | 93 ++++++++++++
iom_select.h | 419 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
prelude.rb | 12 ++
thread.c | 22 +++
vm.c | 7 +-
vm_core.h | 5 +-
11 files changed, 795 insertions(+), 8 deletions(-)
create mode 100644 iom.h
create mode 100644 iom_common.h
create mode 100644 iom_select.h
(I will revert the -O0 change in configure.in, of course :)
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