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Sort the scheduler's channel list by cmux comparisons

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This commit is contained in:
Andrea Shepard 2013-12-02 01:05:28 -08:00
parent 700d6e7525
commit 55907da28d
1 changed files with 51 additions and 2 deletions
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53
src/or/scheduler.c
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@ -139,6 +139,7 @@ static time_t queue_heuristic_timestamp = 0;
/* Scheduler static function declarations */
static int scheduler_compare_channels(const void **c1_v, const void **c2_v);
static void scheduler_evt_callback(evutil_socket_t fd,
short events, void *arg);
static int scheduler_more_work(void);
@ -180,6 +181,52 @@ scheduler_free_all(void)
}
}
/**
* Comparison function to use when sorting pending channels
*/
static int
scheduler_compare_channels(const void **c1_v, const void **c2_v)
{
channel_t *c1 = NULL, *c2 = NULL;
/* These are a workaround for -Wbad-function-cast throwing a fit */
const circuitmux_policy_t *p1, *p2;
uintptr_t p1_i, p2_i;
tor_assert(c1_v);
tor_assert(c2_v);
c1 = (channel_t *)(*c1_v);
c2 = (channel_t *)(*c2_v);
tor_assert(c1);
tor_assert(c2);
if (c1 != c2) {
if (circuitmux_get_policy(c1->cmux) ==
circuitmux_get_policy(c2->cmux)) {
/* Same cmux policy, so use the mux comparison */
return circuitmux_compare_muxes(c1->cmux, c2->cmux);
} else {
/*
* Different policies; not important to get this edge case perfect
* because the current code never actually gives different channels
* different cmux policies anyway. Just use this arbitrary but
* definite choice.
*/
p1 = circuitmux_get_policy(c1->cmux);
p2 = circuitmux_get_policy(c2->cmux);
p1_i = (uintptr_t)p1;
p2_i = (uintptr_t)p2;
return (p1_i < p2_i) ? -1 : 1;
}
} else {
/* c1 == c2, so always equal */
return 0;
}
}
/*
* Scheduler event callback; this should get triggered once per event loop
* if any scheduling work was created during the event loop.
@ -362,9 +409,11 @@ scheduler_run(void)
channels_pending = smartlist_new();
/*
* For now, just run the old scheduler on all the chans in the list, until
* we hit the high-water mark. TODO real channel priority API
* UGLY HACK: sort the list on each invocation
*
* TODO smarter data structures
*/
smartlist_sort(tmp, scheduler_compare_channels);
SMARTLIST_FOREACH_BEGIN(tmp, channel_t *, chan) {
if (scheduler_get_queue_heuristic() <= SCHED_Q_HIGH_WATER) {