Resolver: cancelable resend timer event.
It is safe because re-sending still works during graceful shutdown as
long as resolving takes place (and resolve tasks set their own timeouts
that are not cancelable).
Also, the new ctx->cancelable flag can be set to make resolve task's
timeout event cancelable.
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index d3747d1..cd55520 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -191,6 +191,7 @@
r->event->handler = ngx_resolver_resend_handler;
r->event->data = r;
r->event->log = &cf->cycle->new_log;
+ r->event->cancelable = 1;
r->ident = -1;
r->resend_timeout = 5;
@@ -4008,6 +4009,7 @@
ctx->event->handler = ngx_resolver_timeout_handler;
ctx->event->data = ctx;
ctx->event->log = r->log;
+ ctx->event->cancelable = ctx->cancelable;
ctx->ident = -1;
ngx_add_timer(ctx->event, ctx->timeout);
diff --git a/src/core/ngx_resolver.h b/src/core/ngx_resolver.h
index 6f099b7..0bd3921 100644
--- a/src/core/ngx_resolver.h
+++ b/src/core/ngx_resolver.h
@@ -220,6 +220,7 @@
unsigned quick:1;
unsigned async:1;
+ unsigned cancelable:1;
ngx_uint_t recursion;
ngx_event_t *event;
};