在此范围内未声明C ++ gettid() [英] C++ gettid() was not declared in this scope

问题描述

一个简单的程序是: 我想使用此gettid函数获取两个线程的线程ID.我不想直接做sysCall.我要使用此功能.

A simple program is: I would like to get the thread ID of both of the threads using this gettid function. I do not want to do the sysCall directly. I want to use this function.

#include <iostream>
#include <boost/thread/thread.hpp>
#include <boost/date_time/date.hpp>
#include <unistd.h>
#include <sys/types.h>
using namespace boost;
using namespace std;

boost::thread thread_obj;
boost::thread thread_obj1;

void func(void)
{
    char x;
    cout << "enter y to interrupt" << endl;
    cin >> x;
     pid_t tid = gettid();
    cout << "tid:" << tid << endl;
    if (x == 'y') {
        cout << "x = 'y'" << endl;    
        cout << "thread interrupt" << endl;
    }
}

void real_main() {

   cout << "real main thread" << endl;
    pid_t tid = gettid();
    cout << "tid:" << tid << endl;

    boost::system_time const timeout = boost::get_system_time() + boost::posix_time::seconds(3);
    try {
        boost::this_thread::sleep(timeout);
    }
    catch (boost::thread_interrupted &) {
        cout << "thread interrupted" << endl;
    }

}

int main()
{
    thread_obj1 = boost::thread(&func);
    thread_obj = boost::thread(&real_main);
    thread_obj.join();
}

编译时出现错误；根据手册页完成了对gettid()的使用:

It gives Error on compilation; The use of gettid() has been done according to the man page:

$g++ -std=c++11 -o Intrpt Interrupt.cpp -lboost_system -lboost_thread
Interrupt.cpp: In function ‘void func()’:
Interrupt.cpp:17:25: error: ‘gettid’ was not declared in this scope
      pid_t tid = gettid();

推荐答案

这是一个愚蠢的glibc错误.像这样解决它:

This is a silly glibc bug. Work around it like this:

#include <unistd.h>
#include <sys/syscall.h>
#define gettid() syscall(SYS_gettid)

这篇关于在此范围内未声明C ++ gettid()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！