suricata 3.1 源码分析35 （FlowWorker处理流程4 - 流重用函数）

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static Flow *TcpReuseReplace(ThreadVars *tv, DecodeThreadVars *dtv,FlowBucket *fb, Flow *old_f,const uint32_t hash, const Packet *p)
{/* tag flow as reused so future lookups won't find it */
/*将老流标识为已重用*/old_f->flags |= FLOW_TCP_REUSED;/* get some settings that we move over to the new flow */
/*备份thread_id，后续会根据thread_id将一些设置备份到新的流中*/FlowThreadId thread_id = old_f->thread_id;/* since fb lock is still held this flow won't be found until we are done */FLOWLOCK_UNLOCK(old_f);/* Get a new flow. It will be either a locked flow or NULL */
/*申请新的流，这点之后会详细说明*/Flow *f = FlowGetNew(tv, dtv, p);if (f == NULL) {return NULL;}/* flow is locked *//* put at the start of the list */f->hnext = fb->head;fb->head->hprev = f;fb->head = f;/* initialize and return */
/*根据包初始化流的值，并指明流所属的hash*/FlowInit(f, p);f->flow_hash = hash;f->fb = fb;
/*将之前保存的thread_id赋值给新的流*/f->thread_id = thread_id;return f;
}

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