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Diffstat (limited to 'main/stasis.c')
-rw-r--r--main/stasis.c122
1 files changed, 70 insertions, 52 deletions
diff --git a/main/stasis.c b/main/stasis.c
index eabdfdc1c..db95986ed 100644
--- a/main/stasis.c
+++ b/main/stasis.c
@@ -140,10 +140,10 @@ STASIS_MESSAGE_TYPE_DEFN(stasis_subscription_change_type);
struct stasis_topic {
char *name;
/*! Variable length array of the subscribers */
- ast_vector(struct stasis_subscription *) subscribers;
+ ast_vector(, struct stasis_subscription *) subscribers;
/*! Topics forwarding into this topic */
- ast_vector(struct stasis_topic *) upstream_topics;
+ ast_vector(, struct stasis_topic *) upstream_topics;
};
/* Forward declarations for the tightly-coupled subscription object */
@@ -152,18 +152,28 @@ static int topic_add_subscription(struct stasis_topic *topic,
static int topic_remove_subscription(struct stasis_topic *topic, struct stasis_subscription *sub);
+/*! \brief Lock two topics. */
+#define topic_lock_both(topic1, topic2) \
+ do { \
+ ao2_lock(topic1); \
+ while (ao2_trylock(topic2)) { \
+ AO2_DEADLOCK_AVOIDANCE(topic1); \
+ } \
+ } while (0)
+
static void topic_dtor(void *obj)
{
struct stasis_topic *topic = obj;
/* Subscribers hold a reference to topics, so they should all be
* unsubscribed before we get here. */
- ast_assert(ast_vector_size(topic->subscribers) == 0);
+ ast_assert(ast_vector_size(&topic->subscribers) == 0);
+
ast_free(topic->name);
topic->name = NULL;
- ast_vector_free(topic->subscribers);
- ast_vector_free(topic->upstream_topics);
+ ast_vector_free(&topic->subscribers);
+ ast_vector_free(&topic->upstream_topics);
}
struct stasis_topic *stasis_topic_create(const char *name)
@@ -182,8 +192,8 @@ struct stasis_topic *stasis_topic_create(const char *name)
return NULL;
}
- res |= ast_vector_init(topic->subscribers, INITIAL_SUBSCRIBERS_MAX);
- res |= ast_vector_init(topic->upstream_topics, 0);
+ res |= ast_vector_init(&topic->subscribers, INITIAL_SUBSCRIBERS_MAX);
+ res |= ast_vector_init(&topic->upstream_topics, 0);
if (res != 0) {
return NULL;
@@ -280,6 +290,10 @@ struct stasis_subscription *internal_stasis_subscribe(
{
RAII_VAR(struct stasis_subscription *, sub, NULL, ao2_cleanup);
+ if (!topic) {
+ return NULL;
+ }
+
sub = ao2_alloc(sizeof(*sub), subscription_dtor);
if (!sub) {
return NULL;
@@ -414,8 +428,8 @@ int stasis_subscription_is_subscribed(const struct stasis_subscription *sub)
struct stasis_topic *topic = sub->topic;
SCOPED_AO2LOCK(lock_topic, topic);
- for (i = 0; i < ast_vector_size(topic->subscribers); ++i) {
- if (ast_vector_get(topic->subscribers, i) == sub) {
+ for (i = 0; i < ast_vector_size(&topic->subscribers); ++i) {
+ if (ast_vector_get(&topic->subscribers, i) == sub) {
return 1;
}
}
@@ -466,11 +480,11 @@ static int topic_add_subscription(struct stasis_topic *topic, struct stasis_subs
*
* If we bumped the refcount here, the owner would have to unsubscribe
* and cleanup, which is a bit awkward. */
- ast_vector_append(topic->subscribers, sub);
+ ast_vector_append(&topic->subscribers, sub);
- for (idx = 0; idx < ast_vector_size(topic->upstream_topics); ++idx) {
+ for (idx = 0; idx < ast_vector_size(&topic->upstream_topics); ++idx) {
topic_add_subscription(
- ast_vector_get(topic->upstream_topics, idx), sub);
+ ast_vector_get(&topic->upstream_topics, idx), sub);
}
return 0;
@@ -481,12 +495,13 @@ static int topic_remove_subscription(struct stasis_topic *topic, struct stasis_s
size_t idx;
SCOPED_AO2LOCK(lock_topic, topic);
- for (idx = 0; idx < ast_vector_size(topic->upstream_topics); ++idx) {
+ for (idx = 0; idx < ast_vector_size(&topic->upstream_topics); ++idx) {
topic_remove_subscription(
- ast_vector_get(topic->upstream_topics, idx), sub);
+ ast_vector_get(&topic->upstream_topics, idx), sub);
}
- return ast_vector_remove_elem_unordered(topic->subscribers, sub);
+ return ast_vector_remove_elem_unordered(&topic->subscribers, sub,
+ AST_VECTOR_ELEM_CLEANUP_NOOP);
}
/*!
@@ -512,7 +527,7 @@ static void dispatch_message(struct stasis_subscription *sub,
ao2_bump(message);
if (ast_taskprocessor_push_local(sub->mailbox, dispatch_exec, message) != 0) {
/* Push failed; ugh. */
- ast_log(LOG_DEBUG, "Dropping dispatch\n");
+ ast_log(LOG_ERROR, "Dropping dispatch\n");
ao2_cleanup(message);
}
} else {
@@ -521,26 +536,28 @@ static void dispatch_message(struct stasis_subscription *sub,
}
}
-void stasis_publish(struct stasis_topic *_topic, struct stasis_message *message)
+void stasis_publish(struct stasis_topic *topic, struct stasis_message *message)
{
size_t i;
- /* The topic may be unref'ed by the subscription invocation.
- * Make sure we hold onto a reference while dispatching. */
- RAII_VAR(struct stasis_topic *, topic, ao2_bump(_topic),
- ao2_cleanup);
- SCOPED_AO2LOCK(lock, topic);
ast_assert(topic != NULL);
ast_assert(message != NULL);
- for (i = 0; i < ast_vector_size(topic->subscribers); ++i) {
- struct stasis_subscription *sub =
- ast_vector_get(topic->subscribers, i);
+ /*
+ * The topic may be unref'ed by the subscription invocation.
+ * Make sure we hold onto a reference while dispatching.
+ */
+ ao2_ref(topic, +1);
+ ao2_lock(topic);
+ for (i = 0; i < ast_vector_size(&topic->subscribers); ++i) {
+ struct stasis_subscription *sub = ast_vector_get(&topic->subscribers, i);
ast_assert(sub != NULL);
dispatch_message(sub, message);
}
+ ao2_unlock(topic);
+ ao2_ref(topic, -1);
}
/*!
@@ -570,23 +587,26 @@ static void forward_dtor(void *obj)
struct stasis_forward *stasis_forward_cancel(struct stasis_forward *forward)
{
- if (forward) {
- int idx;
+ int idx;
+ struct stasis_topic *from;
+ struct stasis_topic *to;
- struct stasis_topic *from = forward->from_topic;
- struct stasis_topic *to = forward->to_topic;
+ if (!forward) {
+ return NULL;
+ }
- SCOPED_AO2LOCK(to_lock, to);
+ from = forward->from_topic;
+ to = forward->to_topic;
- ast_vector_remove_elem_unordered(to->upstream_topics, from);
+ topic_lock_both(to, from);
+ ast_vector_remove_elem_unordered(&to->upstream_topics, from,
+ AST_VECTOR_ELEM_CLEANUP_NOOP);
- ao2_lock(from);
- for (idx = 0; idx < ast_vector_size(to->subscribers); ++idx) {
- topic_remove_subscription(
- from, ast_vector_get(to->subscribers, idx));
- }
- ao2_unlock(from);
+ for (idx = 0; idx < ast_vector_size(&to->subscribers); ++idx) {
+ topic_remove_subscription(from, ast_vector_get(&to->subscribers, idx));
}
+ ao2_unlock(from);
+ ao2_unlock(to);
ao2_cleanup(forward);
@@ -596,6 +616,8 @@ struct stasis_forward *stasis_forward_cancel(struct stasis_forward *forward)
struct stasis_forward *stasis_forward_all(struct stasis_topic *from_topic,
struct stasis_topic *to_topic)
{
+ int res;
+ size_t idx;
RAII_VAR(struct stasis_forward *, forward, NULL, ao2_cleanup);
if (!from_topic || !to_topic) {
@@ -610,23 +632,19 @@ struct stasis_forward *stasis_forward_all(struct stasis_topic *from_topic,
forward->from_topic = ao2_bump(from_topic);
forward->to_topic = ao2_bump(to_topic);
- {
- SCOPED_AO2LOCK(lock, to_topic);
- int res;
-
- res = ast_vector_append(to_topic->upstream_topics, from_topic);
- if (res != 0) {
- return NULL;
- }
+ topic_lock_both(to_topic, from_topic);
+ res = ast_vector_append(&to_topic->upstream_topics, from_topic);
+ if (res != 0) {
+ ao2_unlock(from_topic);
+ ao2_unlock(to_topic);
+ return NULL;
+ }
- {
- SCOPED_AO2LOCK(lock, from_topic);
- size_t idx;
- for (idx = 0; idx < ast_vector_size(to_topic->subscribers); ++idx) {
- topic_add_subscription(from_topic, ast_vector_get(to_topic->subscribers, idx));
- }
- }
+ for (idx = 0; idx < ast_vector_size(&to_topic->subscribers); ++idx) {
+ topic_add_subscription(from_topic, ast_vector_get(&to_topic->subscribers, idx));
}
+ ao2_unlock(from_topic);
+ ao2_unlock(to_topic);
return ao2_bump(forward);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-11 08:03:08 +0000