sem_open（）错误：“未定义对sem_open（）的引用” on linux（Ubuntu 10.10） [英] sem_open() error: "undefined reference to sem_open()" on linux (Ubuntu 10.10)

问题描述

所以我得到的错误：未定义的引用sem_open（）即使我已经包括semaphore.h头。同样的事情发生在我所有的pthread函数调用（mutex，pthread_create等）。有什么想法吗？我使用以下命令进行编译：

So I am getting the error: "undefined reference to sem_open()" even though I have include the semaphore.h header. The same thing is happening for all my pthread function calls (mutex, pthread_create, etc). Any thoughts? I am using the following command to compile:

g ++'/home/robin/Desktop/main.cpp'-o'/home/robin/Desktop/main.out '

g++ '/home/robin/Desktop/main.cpp' -o '/home/robin/Desktop/main.out'

#include <iostream>
using namespace std;
#include <pthread.h>
#include <semaphore.h>
#include <fcntl.h>

const char *serverControl = "/serverControl";
sem_t* semID;

int main ( int argc, char *argv[] )
{
    //create semaphore used to control servers
    semID = sem_open(serverControl,O_CREAT,O_RDWR,0);
    return 0;
}

推荐答案

，使用 -lpthread 选项。

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