sem_open不与Ubuntu的工作：未定义的参考`sem_open“ [英] sem_open doesn't work with Ubuntu : undefined reference to `sem_open'

问题描述

有鉴于此code：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <semaphore.h>
#include <pthread.h>

#define BUF_SIZE 256
int main()
{
    key_t key;
    char *virtualaddr;
    sem_t *get, *put;
    int shmid;

   const char* messageOne = "Hello world , I'm child number 1\n";
   const char* messageTwo = "Hello world , I'm child number 2\n";

   char buf[BUF_SIZE];

   key = ftok("anyfile",'R');

  shmid = shmget(key,1024,0644|IPC_CREAT);
...
...
shmctl (shmid, IPC_RMID, NULL);
exit(EXIT_SUCCESS);
}

我从月食未定义的引用到sem_open 。

我检查这个<一个href=\"http://stackoverflow.com/questions/4916881/sem-open-error-undefined-reference-to-sem-open-on-linux-ubuntu-10-10\">post因为这个问题是非常相似的矿，但如果是我的失误并没有完全理解，

I've check with this post since this question is very similar to mine , but didn't understand exactly where is my mistake ,

能否请你解释一下我在哪里需要修复/添加另一个编译命令（如果这是事实确实如此）？

Can you please explain where do I need to fix it / add another compilation command (if this is indeed the case) ?

大部分AP preciated

Much appreciated

推荐答案

您编译时需要包括 -lpthread 。这是由链接器使用，您对二进制链接库。

You need to include -lpthread when compiling. This is used by the linker, to link your binary against the library.

的其他答案已经涵盖如何做到这一点的命令行上。的

为此在Eclipse中，您需要按照指示这里：

To do this in Eclipse, you need to follow the directions here:

在项目属性，进入：C / C ++编译 - >设置。然后
  工具设置，选择库，连接器下。您可以添加
  你的项目库有（不带-l）。另外，在低
  部分，您可以添加到检索库自定义路径

In the project properties, go to : C/C++ Build --> Settings. Then "Tool Settings", select "Libraries" under "Linker". You can add all your project libraries there (without the "-l"). Also in the lower part, you can add custom path to search libraries

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