Qt5 信号与槽研究,线程研究

#include "mainw.h" #include "clockthread.h" MainWindow::MainWindow(QWidget *parent):QMainWindow(parent) { clock_thread1 = new ClockThread(1,this); connect(clock_thread1, SIGNAL(sigReady(int)), this, SLOT(slot_updateClock(int))); connect(this,SIGNAL(startWork()),clock_thread1, SLOT(slotWork())); clock_thread2 = new ClockThread(2,this); connect(clock_thread2, SIGNAL(sigReady(int)), this, SLOT(slot_updateClock(int))); connect(this,SIGNAL(startWork()),clock_thread2, SLOT(slotWork())); ready[0]=0; ready[1]=0; clock_thread1->set_thread_runing(true); clock_thread2->set_thread_runing(true); // clock_thread1->start(); //thread 不运行,signal slot 照样运行 // clock_thread2->start(); emit startWork(); } MainWindow::~MainWindow() { //如果析构函数为空,当然会有 //QThread: Destroyed while thread is still running //已放弃 //如果不停止线程而wait, 会卡死. clock_thread1->set_thread_runing(false); clock_thread2->set_thread_runing(false); //停止了线程,必须等待线程结束, 否则也会有 //QThread: Destroyed while thread is still running //已放弃 clock_thread1->wait(); clock_thread2->wait(); //这句delete 倒是可有可无的,不会内存泄露,此处不加 //MainWindow 的析构中会调用delete, 因为clock_thread 是MainWindow 的子对象 delete clock_thread1; delete clock_thread2; } extern long gettime_us(); void MainWindow::slot_updateClock(int id) { long time=gettime_us(); printf("main receive work ready signal.id:%d,time:%ld\n",id,time/1000); ready[id-1]=1; if(ready[0]==1 && ready[1]==1) { clock_thread1->set_thread_runing(false); clock_thread2->set_thread_runing(false); clock_thread1->wait(); clock_thread2->wait(); ready[0]=0; //初始化 ready[1]=0; clock_thread1->set_thread_runing(true); clock_thread2->set_thread_runing(true); clock_thread1->start(); clock_thread2->start(); emit startWork(); //再一次启动工作 } }