c++11 - C++ gettid() 未在此范围内声明

Question

一个简单的程序是:我想使用 gettid 函数获取两个线程的线程 ID。我不想直接进行 sysCall。我想使用这个功能。

#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； gettid() 的使用已根据手册页完成:

$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();

Answer 1

这是一个愚蠢的 glibc 错误。像这样解决它:

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