Qt 多进程通信之消息队列

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服务端:

#include <fcntl.h>           /* For O_* constants */#include <sys/stat.h>        /* For mode constants */#include <mqueue.h>#include <unistd.h>#include <syslog.h>#define MQNAME  "/fifo1"mqd_t m_mq;//message queue objectbool bExitThread = false;//exit thread conditionpthread_t g_thread;//thread objectvoid* Process(void* args){    while(true){        if(bExitThread){            break;        }        char cData[1024] = {"123"};        int nSend = mq_send(m_mq, cData, strlen(cData), 0);//nonblock        if(errno == EAGAIN){            syslog(LOG_DEBUG, "EAGAIN");        }        if(errno == EBADF){            syslog(LOG_DEBUG, "EBADF");        }        if(errno == EINTR){            syslog(LOG_DEBUG, "EINTR");        }        if(errno == EINVAL){            syslog(LOG_DEBUG, "EINVAL");        }        if(errno == EMSGSIZE){            syslog(LOG_DEBUG, "EMSGSIZE");        }        if(errno == ETIMEDOUT){            syslog(LOG_DEBUG, "ETIMEDOUT");        }        usleep(1000 * 1000);//sleep one second    }}MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    m_mq = mq_open(MQNAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH, NULL);    mq_attr m_attr;    mq_getattr(m_mq, &m_attr);// get attribute from mq    m_attr.mq_flags |= O_NONBLOCK;    mq_setattr(m_mq, &m_attr, NULL);//set nonblock    pthread_create(&g_thread, NULL, Process, this);//start thread}MainWindow::~MainWindow(){    bExitThread = true;//break-thread signal    pthread_join(g_thread, NULL); //wait thread exit    mq_close(m_mq); //close mq object    mq_unlink(MQNAME);//delete mq from kernel    delete ui;}

客户端:

#include <fcntl.h>           /* For O_* constants */#include <sys/stat.h>        /* For mode constants */#include <mqueue.h>#include <unistd.h>#include <syslog.h>#define MQNAME  "/fifo1"mqd_t m_mq;bool bExitThread = false;pthread_t g_thread;void* Process(void* args){    while(true){        if(bExitThread){            break;        }        char cData[8192] = {0};        ssize_t nRecv = mq_receive(m_mq, cData, 8192, 0);        if(errno == EAGAIN){            syslog(LOG_DEBUG, "EAGAIN");        }        if(errno == EBADF){            syslog(LOG_DEBUG, "EBADF");        }        if(errno == EINTR){            syslog(LOG_DEBUG, "EINTR");        }        if(errno == EINVAL){            syslog(LOG_DEBUG, "EINVAL");        }        if(errno == EMSGSIZE){            syslog(LOG_DEBUG, "EMSGSIZE");        }        if(errno == ETIMEDOUT){            syslog(LOG_DEBUG, "ETIMEDOUT");        }        usleep(1000 * 1000);    }}MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    m_mq = mq_open(MQNAME, O_RDWR | O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, NULL);    pthread_create(&g_thread, NULL, Process, this);}MainWindow::~MainWindow(){    bExitThread = true;    pthread_join(g_thread, NULL);    mq_close(m_mq);    mq_unlink(MQNAME);    delete ui;}

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