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authorKeith Burns (alagalah) <alagalah@gmail.com>2018-03-23 13:42:49 -0700
committerFlorin Coras <florin.coras@gmail.com>2018-04-12 20:33:02 +0000
commit410bcca41c1a3e7c3d4b4c2940120f9b21732d49 (patch)
treee79249ffbad91f744d15261b2003eea64bff9e2c /src/vcl/vcl_event.c
parentba1e158082048640686ec0b7791126c9e5c4e0fc (diff)
VCL IOEvent external API callback
Change-Id: I417357b00c43b27872aa3f681335bdc1ef574eca Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com> Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Diffstat (limited to 'src/vcl/vcl_event.c')
-rw-r--r--src/vcl/vcl_event.c91
1 files changed, 47 insertions, 44 deletions
diff --git a/src/vcl/vcl_event.c b/src/vcl/vcl_event.c
index d8bd8c74e36..dafa2500d1d 100644
--- a/src/vcl/vcl_event.c
+++ b/src/vcl/vcl_event.c
@@ -59,10 +59,10 @@ vce_generate_event (vce_event_thread_t *evt, u32 ev_idx)
}
void
-vce_clear_event (vce_event_thread_t *evt, vce_event_t *ev)
+vce_clear_event (vce_event_thread_t *evt, u32 ev_idx)
{
clib_spinlock_lock (&(evt->events_lockp));
- pool_put (evt->vce_events, ev);
+ pool_put_index (evt->vce_events, ev_idx);
clib_spinlock_unlock (&(evt->events_lockp));
}
@@ -70,11 +70,10 @@ vce_event_t *
vce_get_event_from_index(vce_event_thread_t *evt, u32 ev_idx)
{
vce_event_t *ev = 0;
+ /* Assumes caller has obtained the spinlock (evt->events_lockp) */
- clib_spinlock_lock (&(evt->events_lockp));
if ( ! pool_is_free_index (evt->vce_events, ev_idx))
ev = pool_elt_at_index (evt->vce_events, ev_idx);
- clib_spinlock_unlock (&(evt->events_lockp));
return ev;
}
@@ -96,7 +95,7 @@ vce_get_event_handler (vce_event_thread_t *evt, vce_event_key_t *evk)
vce_event_handler_reg_t *
vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
- vce_event_callback_t cb, void *cb_args)
+ vce_event_callback_t cb, void *cb_args)
{
vce_event_handler_reg_t *handler;
vce_event_handler_reg_t *old_handler = 0;
@@ -115,25 +114,25 @@ vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
/* If we are just re-registering, ignore and move on
* else store the old handler_fn for unregister to re-instate */
if (old_handler->handler_fn == cb)
- {
+ {
- clib_spinlock_unlock (&evt->handlers_lockp);
+ clib_spinlock_unlock (&evt->handlers_lockp);
- /* Signal event thread that a handler exists in case any
- * recycled events requiring this handler are pending */
- pthread_mutex_lock (&(evt->generator_lock));
- pthread_cond_signal (&(evt->generator_cond));
- pthread_mutex_unlock (&(evt->generator_lock));
- return old_handler;
- }
+ /* Signal event thread that a handler exists in case any
+ * recycled events requiring this handler are pending */
+ pthread_mutex_lock (&(evt->generator_lock));
+ pthread_cond_signal (&(evt->generator_cond));
+ pthread_mutex_unlock (&(evt->generator_lock));
+ return old_handler;
+ }
}
pool_get (evt->vce_event_handlers, handler);
handler_index = (u32) (handler - evt->vce_event_handlers);
handler->handler_fn = cb;
- handler->replaced_handler_idx = (p) ? p[0] : ~0;
- handler->ev_idx = ~0; //This will be set by the event thread if event happens
+ handler->replaced_handler_idx = (u32) ((p) ? p[0] : ~0);
+ handler->ev_idx = (u32) ~0; //This will be set by the event thread if event happens
handler->evk = evk->as_u64;
handler->handler_fn_args = cb_args;
@@ -210,61 +209,64 @@ vce_event_thread_fn (void *arg)
u32 ev_idx;
vce_event_handler_reg_t *handler;
uword *p;
+ u32 recycle_count = 0;
pthread_mutex_lock (&(evt->generator_lock));
- clib_spinlock_lock (&(evt->events_lockp));
- evt->recycle_event = 1; // Used for recycling events with no handlers
- clib_spinlock_unlock (&(evt->events_lockp));
-
- do
+ while (1)
{
- while ( (clib_fifo_elts (evt->event_index_fifo) == 0) ||
- evt->recycle_event)
- {
- clib_spinlock_lock (&(evt->events_lockp));
- evt->recycle_event = 0;
- clib_spinlock_unlock (&(evt->events_lockp));
- pthread_cond_wait (&(evt->generator_cond),
- &(evt->generator_lock));
- }
+ uword fifo_depth = clib_fifo_elts (evt->event_index_fifo);
+ while ((fifo_depth == 0) || (recycle_count == fifo_depth))
+ {
+ recycle_count = 0;
+ pthread_cond_wait (&(evt->generator_cond), &(evt->generator_lock));
+ fifo_depth = clib_fifo_elts (evt->event_index_fifo);
+ }
/* Remove event */
clib_spinlock_lock (&(evt->events_lockp));
-
clib_fifo_sub1 (evt->event_index_fifo, ev_idx);
- ev = pool_elt_at_index (evt->vce_events, ev_idx);
-
+ ev = vce_get_event_from_index (evt, ev_idx);
ASSERT(ev);
-
+ if (recycle_count && ev->recycle)
+ {
+ clib_fifo_add1 (evt->event_index_fifo, ev_idx);
+ clib_spinlock_unlock (&(evt->events_lockp));
+ continue;
+ }
clib_spinlock_lock (&evt->handlers_lockp);
p = hash_get (evt->handlers_index_by_event_key, ev->evk.as_u64);
if (!p)
- {
- /* If an event falls in the woods, and there is no handler to hear it,
- * does it make any sound?
- * I don't know either, so lets try recycling the event */
- clib_fifo_add1 (evt->event_index_fifo, ev_idx);
- evt->recycle_event = 1;
+ {
+ /* If an event falls in the woods, and there is no handler to hear it,
+ * does it make any sound?
+ * I don't know either, so lets biff the event */
+ pool_put(evt->vce_events, ev);
clib_spinlock_unlock (&(evt->events_lockp));
- clib_spinlock_unlock (&evt->handlers_lockp);
+ clib_spinlock_unlock (&evt->handlers_lockp);
pthread_mutex_unlock (&(evt->generator_lock));
- }
+ }
else
{
+ u32 evt_recycle = ev->recycle;
handler = pool_elt_at_index (evt->vce_event_handlers, p[0]);
handler->ev_idx = ev_idx;
+ ev->recycle = 0;
clib_spinlock_unlock (&(evt->events_lockp));
clib_spinlock_unlock (&evt->handlers_lockp);
pthread_mutex_unlock (&(evt->generator_lock));
(handler->handler_fn)(handler);
+
+ clib_spinlock_lock (&(evt->events_lockp));
+ ev = vce_get_event_from_index (evt, ev_idx);
+ recycle_count += (!evt_recycle && ev && ev->recycle) ? 1 : 0;
+ clib_spinlock_unlock(&(evt->events_lockp));
}
pthread_mutex_lock (&(evt->generator_lock));
}
- while (1);
return NULL;
}
@@ -281,5 +283,6 @@ vce_start_event_thread (vce_event_thread_t *evt, u8 max_events)
clib_spinlock_init (&(evt->handlers_lockp));
return pthread_create (&(evt->thread), NULL /* attr */ ,
- vce_event_thread_fn, evt);
+ vce_event_thread_fn, evt);
}
+