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moduo之线程Thread

news 来源：原创 2025/6/19 11:45:42

简介

moduo中的线程不是像ACE，asio抽象出线程适配器基类，而是直接使用特定的线程数据ThreadData

线程

Thread

线程成员有

bool       started_;  //线程启动状态
bool       joined_;//是否调用join
pthread_t  pthreadId_;//线程id
pid_t      tid_;//线程id
ThreadFunc func_;//线程处理函数
string     name_;//线程名，没有指定时，默认是Thread+线程创建的个数
CountDownLatch latch_;//线程启动时，等待线程起来static AtomicInt32 numCreated_;//线程总个数

构造函数，latch_初始为1，设置默认线程名


Thread::Thread(ThreadFunc func, const string& n): started_(false),joined_(false),pthreadId_(0),tid_(0),func_(std::move(func)),name_(n),latch_(1)
{setDefaultName();
}void Thread::setDefaultName()
{int num = numCreated_.incrementAndGet();if (name_.empty()){char buf[32];snprintf(buf, sizeof buf, "Thread%d", num);name_ = buf;}
}

线程启动，设置started_ 为true，创建ThreadData数据，将线程执行函数func_，线程名name_，线程id引用tid_，线程同步latch_传给ThreadData，传给linux线程创建函数，线程启动函数为startThread，内部执行ThreadData的runInThread方法

void Thread::start()
{assert(!started_);started_ = true;// FIXME: move(func_)detail::ThreadData* data = new detail::ThreadData(func_, name_, &tid_, &latch_);if (pthread_create(&pthreadId_, NULL, &detail::startThread, data)){started_ = false;delete data; // or no delete?LOG_SYSFATAL << "Failed in pthread_create";}else{latch_.wait();assert(tid_ > 0);}
}void* startThread(void* obj)
{ThreadData* data = static_cast<ThreadData*>(obj);data->runInThread();delete data;return NULL;
}void runInThread(){*tid_ = muduo::CurrentThread::tid();tid_ = NULL;latch_->countDown();latch_ = NULL;muduo::CurrentThread::t_threadName = name_.empty() ? "muduoThread" : name_.c_str();::prctl(PR_SET_NAME, muduo::CurrentThread::t_threadName);try{func_();muduo::CurrentThread::t_threadName = "finished";}catch (const Exception& ex){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "exception caught in Thread %s\n", name_.c_str());fprintf(stderr, "reason: %s\n", ex.what());fprintf(stderr, "stack trace: %s\n", ex.stackTrace());abort();}catch (const std::exception& ex){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "exception caught in Thread %s\n", name_.c_str());fprintf(stderr, "reason: %s\n", ex.what());abort();}catch (...){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "unknown exception caught in Thread %s\n", name_.c_str());throw; // rethrow}}

ThreadData

线程数据，其成员有

  typedef muduo::Thread::ThreadFunc ThreadFunc;ThreadFunc func_;//线程处理函数string name_;//线程名pid_t* tid_;//线路idCountDownLatch* latch_;//同步调用线程和新建线程

构造函数

  ThreadData(ThreadFunc func,const string& name,pid_t* tid,CountDownLatch* latch): func_(std::move(func)),name_(name),tid_(tid),latch_(latch){ }

执行线程函数，设置线程tid_，同步计数减1，唤醒调用线程，设置当前线程名

void runInThread(){*tid_ = muduo::CurrentThread::tid();tid_ = NULL;latch_->countDown();latch_ = NULL;muduo::CurrentThread::t_threadName = name_.empty() ? "muduoThread" : name_.c_str();::prctl(PR_SET_NAME, muduo::CurrentThread::t_threadName);try{func_();muduo::CurrentThread::t_threadName = "finished";}catch (const Exception& ex){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "exception caught in Thread %s\n", name_.c_str());fprintf(stderr, "reason: %s\n", ex.what());fprintf(stderr, "stack trace: %s\n", ex.stackTrace());abort();}catch (const std::exception& ex){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "exception caught in Thread %s\n", name_.c_str());fprintf(stderr, "reason: %s\n", ex.what());abort();}catch (...){muduo::CurrentThread::t_threadName = "crashed";fprintf(stderr, "unknown exception caught in Thread %s\n", name_.c_str());throw; // rethrow}}