/*
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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::ShmMsgQueue(ShmType &segment, const MQId id, const int len) :
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id_(id),
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queue_(segment, MsgQIdToName(id_), len, segment.get_segment_manager())
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{
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}
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ShmMsgQueue::ShmMsgQueue(ShmType &segment, const bool create_or_else_find, const MQId id, const int len) :
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id_(id),
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queue_(segment, create_or_else_find, MsgQIdToName(id_), len, segment.get_segment_manager())
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{
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if (!queue_.IsOk()) {
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throw("error create/find msgq " + std::to_string(id_));
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}
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}
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ShmMsgQueue::ShmMsgQueue(const int64_t abs_addr, ShmType &segment, const MQId id) :
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id_(id), queue_(abs_addr, segment, MsgQIdToName(id_))
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{
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//TODO check some tag.
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}
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ShmMsgQueue::~ShmMsgQueue() {}
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#ifndef BH_USE_ATOMIC_Q
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ShmMsgQueue::Mutex &ShmMsgQueue::GetMutex(const MQId id)
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{
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static std::unordered_map<MQId, std::shared_ptr<Mutex>> imm;
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static std::mutex mtx;
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std::lock_guard<std::mutex> lock(mtx);
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auto pos = imm.find(id);
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if (pos == imm.end()) {
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pos = imm.emplace(id, new Mutex(id)).first;
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// pos = imm.emplace(id, new Mutex()).first;
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}
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return *pos->second;
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}
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#endif
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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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RawData val = 0;
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while (q->TryRead(val)) {
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if (IsCmd(val)) {
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LOG_DEBUG() << "clsing queue " << id << ", has a cmd" << DecodeCmd(val);
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} else {
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MsgI(val, shm).Release();
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}
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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 MQInfo &remote, const RawData val)
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{
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try {
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//TODO find from center, or use offset.
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ShmMsgQueue dest(remote.offset_, shm, remote.id_);
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#ifndef BH_USE_ATOMIC_Q
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Guard lock(GetMutex(remote_id));
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#endif
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return dest.queue().TryWrite(val);
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} catch (...) {
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// SetLastError(eNotFound, "remote not found");
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return false;
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}
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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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