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[nginx] SSL: reworked posted next events again.

Maxim Dounin
December 27, 2019 11:54AM
details: https://hg.nginx.org/nginx/rev/f1720934c45b
branches:
changeset: 7617:f1720934c45b
user: Maxim Dounin <mdounin@mdounin.ru>
date: Fri Dec 27 19:43:01 2019 +0300
description:
SSL: reworked posted next events again.

Previous change 1ce3f01a4355 incorrectly introduced processing of the
ngx_posted_next_events queue at the end of operation, effectively making
posted next events a nop, since at the end of an event loop iteration
the queue is always empty. Correct approach is to move events to the
ngx_posted_events queue at an iteration start, as it was done previously.

Further, in some cases the c->read event might be already in the
ngx_posted_events queue, and calling ngx_post_event() with the
ngx_posted_next_events queue won't do anything. To make sure the event
will be correctly placed into the ngx_posted_next_events queue
we now check if it is already posted.

diffstat:

src/event/ngx_event.c | 2 +-
src/event/ngx_event_openssl.c | 4 ++++
src/event/ngx_event_posted.c | 22 ++++++++++------------
src/event/ngx_event_posted.h | 2 +-
4 files changed, 16 insertions(+), 14 deletions(-)

diffs (85 lines):

diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -238,6 +238,7 @@ ngx_process_events_and_timers(ngx_cycle_
}

if (!ngx_queue_empty(&ngx_posted_next_events)) {
+ ngx_event_move_posted_next(cycle);
timer = 0;
}

@@ -261,7 +262,6 @@ ngx_process_events_and_timers(ngx_cycle_
}

ngx_event_process_posted(cycle, &ngx_posted_events);
- ngx_event_process_posted_next(cycle, &ngx_posted_next_events);
}


diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -2017,6 +2017,10 @@ ngx_ssl_recv(ngx_connection_t *c, u_char
c->read->available = 0;
c->read->ready = 0;

+ if (c->read->posted) {
+ ngx_delete_posted_event(c->read);
+ }
+
ngx_post_event(c->read, &ngx_posted_next_events);
}

diff --git a/src/event/ngx_event_posted.c b/src/event/ngx_event_posted.c
--- a/src/event/ngx_event_posted.c
+++ b/src/event/ngx_event_posted.c
@@ -37,26 +37,24 @@ ngx_event_process_posted(ngx_cycle_t *cy


void
-ngx_event_process_posted_next(ngx_cycle_t *cycle, ngx_queue_t *posted)
+ngx_event_move_posted_next(ngx_cycle_t *cycle)
{
ngx_queue_t *q;
ngx_event_t *ev;

- while (!ngx_queue_empty(posted)) {
-
- q = ngx_queue_head(posted);
+ for (q = ngx_queue_head(&ngx_posted_next_events);
+ q != ngx_queue_sentinel(&ngx_posted_next_events);
+ q = ngx_queue_next(q))
+ {
ev = ngx_queue_data(q, ngx_event_t, queue);

ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"posted next event %p", ev);

- ngx_delete_posted_event(ev);
+ ev->ready = 1;
+ ev->available = -1;
+ }

- if (!ev->ready) {
- ev->ready = 1;
- ev->available = -1;
- }
-
- ev->handler(ev);
- }
+ ngx_queue_add(&ngx_posted_events, &ngx_posted_next_events);
+ ngx_queue_init(&ngx_posted_next_events);
}
diff --git a/src/event/ngx_event_posted.h b/src/event/ngx_event_posted.h
--- a/src/event/ngx_event_posted.h
+++ b/src/event/ngx_event_posted.h
@@ -39,7 +39,7 @@


void ngx_event_process_posted(ngx_cycle_t *cycle, ngx_queue_t *posted);
-void ngx_event_process_posted_next(ngx_cycle_t *cycle, ngx_queue_t *posted);
+void ngx_event_move_posted_next(ngx_cycle_t *cycle);


extern ngx_queue_t ngx_posted_accept_events;
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[nginx] SSL: reworked posted next events again.

Maxim Dounin 136 December 27, 2019 11:54AM



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