getting error for pthread_create function in gcc compiler

[vineeta7]

Hi

I am new to GCC.I am trying to execute simple C program to create thread using pthread_create function.when I executes this program , I am getting error as follows:

[vineeta@vineeta vineeta]$ gcc -o thread thread.c
/tmp/ccLdGdjo.o(.text+0x2d): In function `main':
: undefined reference to `pthread_create'
/tmp/ccLdGdjo.o(.text+0x46): In function `main':
: undefined reference to `pthread_create'
/tmp/ccLdGdjo.o(.text+0x59): In function `main':
: undefined reference to `pthread_join'
/tmp/ccLdGdjo.o(.text+0x69): In function `main':
: undefined reference to `pthread_join'
collect2: ld returned 1 exit statu

Why I am getting this error and how to resolve this error???

Thanks
vineeta

[Franklin52]

Hi,

Welcome to the forum.

The pthread functions are not included in the standard C library. They are in libpthread, so you should add -lpthread to the command line when you link your program like:

gcc -o thread thread.c -lpthread

Regards