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#include "packet_pool.h"
static void return_internal(struct nn_packet_pool *pool, struct nn_packet *packet)
{
nn_packet_reset(packet);
al_array_push(pool->empty, packet);
}
static void signal_callback(struct ev_loop *loop, ev_async *w, s32 revents)
{
(void)loop;
struct nn_packet_pool *pool = (struct nn_packet_pool *)w->data;
(void)revents;
nn_mutex_lock(&pool->mutex);
al_assert(pool->flushing);
pool->flushing = false;
if (pool->disabled) {
nn_mutex_unlock(&pool->mutex);
return;
}
// Asserting on this and pool->flushing above is not necessary for correctness.
al_assert(pool->ready.count > 0);
al_array_copy(pool->sending, pool->ready);
pool->ready.count = 0;
nn_mutex_unlock(&pool->mutex);
struct nn_packet *packet;
al_array_foreach(pool->sending, i, packet) {
pool->callback(pool->userdata, packet);
}
pool->sending.count = 0;
}
void nn_packet_pool_init(struct nn_packet_pool *pool, u32 size,
struct nn_event_loop *loop, void (*callback)(void *, struct nn_packet *), void *userdata)
{
pool->loop = loop;
pool->size = size;
pool->grow = false;
pool->flushing = false;
pool->disabled = false;
nn_cond_init(&pool->cond);
nn_mutex_init(&pool->mutex);
al_array_init(pool->ready);
al_array_reserve(pool->ready, size);
al_array_init(pool->empty);
al_array_reserve(pool->empty, size);
for (u32 i = 0; i < size; i++) {
al_array_push(pool->empty, nn_packet_create());
}
al_array_init(pool->sending);
pool->signal.data = pool;
ev_async_init_n(&pool->signal, signal_callback);
ev_async_start(pool->loop->ev, &pool->signal);
pool->callback = callback;
pool->userdata = userdata;
}
struct nn_packet *nn_packet_pool_get(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
if (!pool->disabled && !pool->empty.count) {
if (pool->grow) {
al_array_push(pool->empty, nn_packet_create());
} else {
nn_cond_wait(&pool->cond, &pool->mutex);
}
}
if (pool->disabled) {
nn_mutex_unlock(&pool->mutex);
return NULL;
}
struct nn_packet *packet = al_array_pop(pool->empty);
nn_mutex_unlock(&pool->mutex);
return packet;
}
void nn_packet_pool_submit(struct nn_packet_pool *pool, struct nn_packet *packet)
{
nn_mutex_lock(&pool->mutex);
if (pool->disabled) {
return_internal(pool, packet);
nn_mutex_unlock(&pool->mutex);
return;
}
al_array_push(pool->ready, packet);
bool flush = pool->ready.count >= pool->size / 2;
if (!pool->flushing && flush) {
pool->flushing = true;
ev_async_send(pool->loop->ev, &pool->signal);
}
nn_mutex_unlock(&pool->mutex);
}
void nn_packet_pool_flush(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
if (!pool->disabled && !pool->flushing && pool->ready.count > 0) {
pool->flushing = true;
ev_async_send(pool->loop->ev, &pool->signal);
}
nn_mutex_unlock(&pool->mutex);
}
void nn_packet_pool_lock(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
}
void nn_packet_pool_return(struct nn_packet_pool *pool, struct nn_packet *packet)
{
return_internal(pool, packet);
}
void nn_packet_pool_unlock(struct nn_packet_pool *pool)
{
if (!pool->disabled && pool->empty.count > 0 && nn_cond_is_waiting(&pool->cond)) {
nn_cond_signal(&pool->cond);
}
nn_mutex_unlock(&pool->mutex);
}
void nn_packet_pool_disable(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
al_assert(!pool->disabled);
pool->disabled = true;
// This makes disable()/enable() required to be called from the loop thread.
ev_async_stop(pool->loop->ev, &pool->signal);
pool->flushing = false;
struct nn_packet *packet;
al_array_foreach(pool->ready, i, packet) {
nn_packet_reset(packet);
al_array_push(pool->empty, packet);
}
pool->ready.count = 0;
if (nn_cond_is_waiting(&pool->cond)) {
nn_cond_signal(&pool->cond);
}
nn_mutex_unlock(&pool->mutex);
}
void nn_packet_pool_enable(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
al_assert(pool->disabled);
pool->disabled = false;
ev_async_start(pool->loop->ev, &pool->signal);
nn_mutex_unlock(&pool->mutex);
}
void nn_packet_pool_free(struct nn_packet_pool *pool)
{
nn_mutex_lock(&pool->mutex);
if (!pool->disabled) {
ev_async_stop(pool->loop->ev, &pool->signal);
} else {
al_assert(!ev_is_active_n(&pool->signal));
}
nn_mutex_unlock(&pool->mutex);
struct nn_packet *packet;
al_array_foreach(pool->empty, i, packet) {
nn_packet_free(packet);
}
al_array_free(pool->empty);
al_array_foreach(pool->ready, i, packet) {
nn_packet_free(packet);
}
al_array_free(pool->ready);
al_array_foreach(pool->sending, i, packet) {
nn_packet_free(packet);
}
al_array_free(pool->sending);
nn_mutex_destroy(&pool->mutex);
nn_cond_destroy(&pool->cond);
}
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