void
stats_aggregate_force(struct stats *st)
{
pthread_mutex_lock(&st->stats_mutex);
st->aggregate = 1;
stats_aggregate(st);
st->updated = 1;
stats_swap(st);
stats_aggregate(st);
stats_pool_reset(&st->shadow);
stats_pool_reset(&st->current);
pthread_mutex_unlock(&st->stats_mutex);
}
void
stats_swap(struct stats *st)
{
if (!stats_enabled) {
return;
}
if (st->aggregate == 1) {
log_debug(LOG_PVERB, "skip swap of current %p shadow %p as aggregator "
"is busy", st->current.elem, st->shadow.elem);
return;
}
if (st->updated == 0) {
log_debug(LOG_PVERB, "skip swap of current %p shadow %p as there is "
"nothing new", st->current.elem, st->shadow.elem);
return;
}
log_debug(LOG_PVERB, "swap stats current %p shadow %p", st->current.elem,
st->shadow.elem);
array_swap(&st->current, &st->shadow);
/*
* Reset current (a) stats before giving it back to generator to keep
* stats addition idempotent
*/
stats_pool_reset(&st->current);
st->updated = 0;
st->aggregate = 1;
}
//把current数据拷贝到shadow，然后在stats_aggregate进行合并
//只要有读写事件则更新统计信息，然后拷贝到shadow,最终在stats_aggregate进行合并
void
stats_swap(struct stats *st)
{
if (!stats_enabled) {
return;
}
if (st->aggregate == 1) { /* 客户端 */
log_debug(LOG_PVERB, "skip swap of current %p shadow %p as aggregator "
"is busy", st->current.elem, st->shadow.elem);
return;
}
if (st->updated == 0) {/* 在客户端通过22222两次获取统计信息这段时间内必须要有相关参数的更新，这里才会置1 */
log_debug(LOG_PVERB, "skip swap of current %p shadow %p as there is "
"nothing new", st->current.elem, st->shadow.elem);
return;
}
log_debug(LOG_PVERB, "swap stats current %p shadow %p", st->current.elem,
st->shadow.elem);
array_swap(&st->current, &st->shadow);
//把current数据拷贝到shadow，然后在stats_aggregate进行合并
/*
* Reset current (a) stats before giving it back to generator to keep
* stats addition idempotent
*/
stats_pool_reset(&st->current);
st->updated = 0;
st->aggregate = 1;
}
