/*
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* =====================================================================================
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*
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* Filename: shm_msg_queue.cpp
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*
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* Description:
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*
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* Version: 1.0
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* Created: 2021年04月26日 16时25分05秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (), lichao@aiotlink.com
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* Organization:
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*
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* =====================================================================================
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*/
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#include "shm_msg_queue.h"
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using namespace bhome_msg;
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using namespace boost::interprocess;
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namespace
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{
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std::string MsgQIdToName(const ShmMsgQueue::MQId id)
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{
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char buf[40] = "mqOx";
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int n = sprintf(buf + 4, "%lx", id);
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return std::string(buf, n + 4);
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}
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} // namespace
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ShmMsgQueue::MQId ShmMsgQueue::NewId()
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{
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static auto &id = GetData();
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return (++id) * 10;
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}
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// ShmMsgQueue memory usage: (320 + 16*length) bytes, length >= 2
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ShmMsgQueue::ShmMsgQueue(const MQId id, ShmType &segment, const int len) :
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id_(id),
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queue_(segment, MsgQIdToName(id_)) //, AdjustMQLength(len), segment.get_segment_manager())
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{
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}
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ShmMsgQueue::ShmMsgQueue(ShmType &segment, const int len) :
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id_(NewId()),
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queue_(segment, true, MsgQIdToName(id_)) //, AdjustMQLength(len), segment.get_segment_manager())
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{
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if (!queue_.IsOk()) {
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throw("error create msgq " + std::to_string(id_));
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}
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}
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ShmMsgQueue::~ShmMsgQueue() {}
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bool ShmMsgQueue::Remove(SharedMemory &shm, const MQId id)
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{
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Queue *q = Find(shm, id);
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if (q) {
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MsgI msg;
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while (q->TryRead(msg.OffsetRef())) {
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msg.Release();
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}
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}
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return Shmq::Remove(shm, MsgQIdToName(id));
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}
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ShmMsgQueue::Queue *ShmMsgQueue::Find(SharedMemory &shm, const MQId remote_id)
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{
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return Shmq::Find(shm, MsgQIdToName(remote_id));
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}
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bool ShmMsgQueue::TrySend(SharedMemory &shm, const MQId remote_id, MsgI msg)
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{
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Queue *remote = Find(shm, remote_id);
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bool r = false;
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if (remote) {
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msg.AddRef();
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r = remote->TryWrite(msg.Offset());
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if (!r) {
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msg.Release();
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}
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}
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return r;
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}
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// Test shows that in the 2 cases:
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// 1) build msg first, then find remote queue;
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// 2) find remote queue first, then build msg;
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// 1 is about 50% faster than 2, maybe cache related.
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