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ruby/ruby-2.4.2-IO-close-do-not-enqueue-redundant-interrupts.patch

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From 27251312111b7e25e347773e5777ee6072f9289b Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 8 Jul 2017 02:21:36 +0000
Subject: [PATCH] merge revision(s) 58284,58812,59028: [Backport #13632]
vm_core.h: ruby_error_stream_closed
* vm_core.h (ruby_special_exceptions): renamed
ruby_error_closed_stream as ruby_error_stream_closed, like the
message.
speed up IO#close with many threads
Today, it increases IO#close performance with many threads:
Execution time (sec)
name trunk after
vm_thread_close 4.276 3.018
Speedup ratio: compare with the result of `trunk' (greater is better)
name after
vm_thread_close 1.417
This speedup comes because rb_notify_fd_close only scans threads
inside rb_thread_io_blocking_region, not all threads in the VM.
In the future, this type data structure may allow us to notify
waiters of multiple FDs on a single thread (when using
Fibers).
* thread.c (struct waiting_fd): declare
(rb_thread_io_blocking_region): use on-stack list waiter
(rb_notify_fd_close): walk vm->waiting_fds instead
(call_without_gvl): remove old field setting
(th_init): ditto
* vm_core.h (typedef struct rb_vm_struct): add waiting_fds list
* (typedef struct rb_thread_struct): remove waiting_fd field
(rb_vm_living_threads_init): initialize waiting_fds list
I am now kicking myself for not thinking about this 3 years ago
when I introduced ccan/list in [Feature #9632] to optimize this
same function :<
IO#close: do not enqueue redundant interrupts (take #2)
Enqueuing multiple errors for one event causes spurious errors
down the line, as reported by Nikolay Vashchenko in
https://bugs.ruby-lang.org/issues/13632
This should fix bad interactions with test_race_gets_and_close
in test/ruby/test_io.rb since we ensure rb_notify_fd_close
continues returning the busy flag after enqueuing the interrupt.
Backporting changes to 2.4 and earlier releases will be more
challenging...
* thread.c (rb_notify_fd_close): do not enqueue multiple interrupts
[ruby-core:81581] [Bug #13632]
* test/ruby/test_io.rb (test_single_exception_on_close):
new test based on script from Nikolay
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59286 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
test/ruby/test_io.rb | 22 ++++++++++++++++++++++
thread.c | 36 +++++++++++++++++++++++++-----------
vm.c | 1 -
vm_core.h | 6 +++---
4 files changed, 50 insertions(+), 15 deletions(-)
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 61dfba318042..034dac570ce4 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2809,6 +2809,28 @@ def test_cross_thread_close_stdio
end;
end
+ def test_single_exception_on_close
+ a = []
+ t = []
+ 10.times do
+ r, w = IO.pipe
+ a << [r, w]
+ t << Thread.new do
+ while r.gets
+ end rescue IOError
+ Thread.current.pending_interrupt?
+ end
+ end
+ a.each do |r, w|
+ w.write -"\n"
+ w.close
+ r.close
+ end
+ t.each do |th|
+ assert_equal false, th.value, '[ruby-core:81581] [Bug #13632]'
+ end
+ end
+
def test_open_mode
feature4742 = "[ruby-core:36338]"
bug6055 = '[ruby-dev:45268]'
diff --git a/thread.c b/thread.c
index 7391cf96d284..2691fd835de4 100644
--- a/thread.c
+++ b/thread.c
@@ -95,7 +95,11 @@ static int rb_threadptr_pending_interrupt_empty_p(rb_thread_t *th);
#define eTerminateSignal INT2FIX(1)
static volatile int system_working = 1;
-#define closed_stream_error GET_VM()->special_exceptions[ruby_error_closed_stream]
+struct waiting_fd {
+ struct list_node wfd_node; /* <=> vm.waiting_fds */
+ rb_thread_t *th;
+ int fd;
+};
inline static void
st_delete_wrap(st_table *table, st_data_t key)
@@ -1310,7 +1314,6 @@ call_without_gvl(void *(*func)(void *), void *data1,
rb_thread_t *th = GET_THREAD();
int saved_errno = 0;
- th->waiting_fd = -1;
if (ubf == RUBY_UBF_IO || ubf == RUBY_UBF_PROCESS) {
ubf = ubf_select;
data2 = th;
@@ -1433,11 +1436,15 @@ VALUE
rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, int fd)
{
volatile VALUE val = Qundef; /* shouldn't be used */
+ rb_vm_t *vm = GET_VM();
rb_thread_t *th = GET_THREAD();
volatile int saved_errno = 0;
int state;
+ struct waiting_fd wfd;
- th->waiting_fd = fd;
+ wfd.fd = fd;
+ wfd.th = th;
+ list_add(&vm->waiting_fds, &wfd.wfd_node);
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
@@ -1448,8 +1455,8 @@ rb_thread_io_blocking_region(rb_blocking_function_t *func, void *data1, int fd)
}
TH_POP_TAG();
- /* clear waiting_fd anytime */
- th->waiting_fd = -1;
+ /* must be deleted before jump */
+ list_del(&wfd.wfd_node);
if (state) {
TH_JUMP_TAG(th, state);
@@ -2195,16 +2202,23 @@ int
rb_notify_fd_close(int fd)
{
rb_vm_t *vm = GET_THREAD()->vm;
- rb_thread_t *th = 0;
+ struct waiting_fd *wfd = 0;
int busy;
busy = 0;
- list_for_each(&vm->living_threads, th, vmlt_node) {
- if (th->waiting_fd == fd) {
- VALUE err = th->vm->special_exceptions[ruby_error_closed_stream];
+ list_for_each(&vm->waiting_fds, wfd, wfd_node) {
+ if (wfd->fd == fd) {
+ rb_thread_t *th = wfd->th;
+ VALUE err;
+
+ busy = 1;
+ if (!th) {
+ continue;
+ }
+ wfd->th = 0;
+ err = th->vm->special_exceptions[ruby_error_stream_closed];
rb_threadptr_pending_interrupt_enque(th, err);
rb_threadptr_interrupt(th);
- busy = 1;
}
}
return busy;
@@ -4839,7 +4853,7 @@ Init_Thread(void)
rb_define_method(rb_cThread, "name=", rb_thread_setname, 1);
rb_define_method(rb_cThread, "inspect", rb_thread_inspect, 0);
- rb_vm_register_special_exception(ruby_error_closed_stream, rb_eIOError, "stream closed");
+ rb_vm_register_special_exception(ruby_error_stream_closed, rb_eIOError, "stream closed");
cThGroup = rb_define_class("ThreadGroup", rb_cObject);
rb_define_alloc_func(cThGroup, thgroup_s_alloc);
diff --git a/vm.c b/vm.c
index 0544bcc4e573..c8ed39ad1e47 100644
--- a/vm.c
+++ b/vm.c
@@ -2477,7 +2477,6 @@ th_init(rb_thread_t *th, VALUE self)
th->status = THREAD_RUNNABLE;
th->errinfo = Qnil;
th->last_status = Qnil;
- th->waiting_fd = -1;
th->root_svar = Qfalse;
th->local_storage_recursive_hash = Qnil;
th->local_storage_recursive_hash_for_trace = Qnil;
diff --git a/vm_core.h b/vm_core.h
index d0385d219f82..8e2b93d8e9b2 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -427,7 +427,7 @@ enum ruby_special_exceptions {
ruby_error_reenter,
ruby_error_nomemory,
ruby_error_sysstack,
- ruby_error_closed_stream,
+ ruby_error_stream_closed,
ruby_special_error_count
};
@@ -490,6 +490,7 @@ typedef struct rb_vm_struct {
struct rb_thread_struct *main_thread;
struct rb_thread_struct *running_thread;
+ struct list_head waiting_fds; /* <=> struct waiting_fd */
struct list_head living_threads;
size_t living_thread_num;
VALUE thgroup_default;
@@ -712,8 +713,6 @@ typedef struct rb_thread_struct {
/* passing state */
int state;
- int waiting_fd;
-
/* for rb_iterate */
VALUE passed_block_handler;
@@ -1445,6 +1444,7 @@ void rb_thread_wakeup_timer_thread(void);
static inline void
rb_vm_living_threads_init(rb_vm_t *vm)
{
+ list_head_init(&vm->waiting_fds);
list_head_init(&vm->living_threads);
vm->living_thread_num = 0;
}
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