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Minor optimizations on bufferevent_trigger options

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By making BEV_TRIG_DEFER_CALLBACKS equal to BEV_OPT_DEFER_CALLBACKS,
and BEV_TRIG_IGNORE_WATERMARKS disjoint from BEV_OPT_*, we can save a
few operations in bufferevent_run_*, which is critical-path.
This commit is contained in:
Nick Mathewson 2013-12-24 11:30:06 -05:00
parent 4dd3abd41f
commit a3172a415b
2 changed files with 15 additions and 10 deletions
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18
bufferevent.c
View File

@ -226,8 +226,7 @@ bufferevent_run_readcb_(struct bufferevent *bufev, int options)
EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
if (bufev->readcb == NULL)
return;
if ((p->options & BEV_OPT_DEFER_CALLBACKS) ||
(options & BEV_TRIG_DEFER_CALLBACKS)) {
if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) {
p->readcb_pending = 1;
SCHEDULE_DEFERRED(p);
} else {
@ -243,8 +242,7 @@ bufferevent_run_writecb_(struct bufferevent *bufev, int options)
EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
if (bufev->writecb == NULL)
return;
if ((p->options & BEV_OPT_DEFER_CALLBACKS) ||
(options & BEV_TRIG_DEFER_CALLBACKS)) {
if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) {
p->writecb_pending = 1;
SCHEDULE_DEFERRED(p);
} else {
@ -252,11 +250,16 @@ bufferevent_run_writecb_(struct bufferevent *bufev, int options)
}
}
#define BEV_TRIG_ALL_OPTS ( \
BEV_TRIG_IGNORE_WATERMARKS| \
BEV_TRIG_DEFER_CALLBACKS \
)
void
bufferevent_trigger(struct bufferevent *bufev, short iotype, int options)
{
bufferevent_incref_and_lock_(bufev);
bufferevent_trigger_nolock_(bufev, iotype, options);
bufferevent_trigger_nolock_(bufev, iotype, options&BEV_TRIG_ALL_OPTS);
bufferevent_decref_and_unlock_(bufev);
}
@ -268,8 +271,7 @@ bufferevent_run_eventcb_(struct bufferevent *bufev, short what, int options)
EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
if (bufev->errorcb == NULL)
return;
if ((p->options & BEV_OPT_DEFER_CALLBACKS) ||
(options & BEV_TRIG_DEFER_CALLBACKS)) {
if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) {
p->eventcb_pending |= what;
p->errno_pending = EVUTIL_SOCKET_ERROR();
SCHEDULE_DEFERRED(p);
@ -282,7 +284,7 @@ void
bufferevent_trigger_event(struct bufferevent *bufev, short what, int options)
{
bufferevent_incref_and_lock_(bufev);
bufferevent_run_eventcb_(bufev, what, options);
bufferevent_run_eventcb_(bufev, what, options&BEV_TRIG_ALL_OPTS);
bufferevent_decref_and_unlock_(bufev);
}

7
include/event2/bufferevent.h
View File

@ -564,10 +564,13 @@ int bufferevent_flush(struct bufferevent *bufev,
*/
enum bufferevent_trigger_options {
/** trigger the callback regardless of the watermarks */
BEV_TRIG_IGNORE_WATERMARKS = (1<<0),
BEV_TRIG_IGNORE_WATERMARKS = (1<<16),
/** defer even if the callbacks are not */
BEV_TRIG_DEFER_CALLBACKS = (1<<1),
BEV_TRIG_DEFER_CALLBACKS = BEV_OPT_DEFER_CALLBACKS,
/* (Note: for internal reasons, these need to be disjoint from
* bufferevent_options, except when they mean the same thing. */
};
/**