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I have a small a program that should start a 2nd Thread. the problem is that, when try to make an executable file of this program using make. I get :

 engine@ubuntu:~/Desktop/Lecture$ make thread
 cc     thread.c   -o thread
 thread.c: In function ‘main’:
  thread.c:10:2: error: unknown type name ‘pthread’  .............

here is my code :

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>

void *func(void*);

int main(){

pthread tid;
if (pthread_create(&tid,NULL,fun,NULL)!= 0 ){
    printf("error by _ pthread \n");
}
printf ( "thread output1 \n");
sleep(1);
return EXIT_SUCCESS;
  }  

 void *fun(void* data){
printf("thread output2 \n")
  }

I don't think that program is wrong, it maybe the way I'm running the make command ?

any Idea why do I get this. thanks in advance for your help

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1  
this isn't related to ubuntu. i've flagged your question; it'll probably get moved to Stack Overflow. –  strugee May 31 '13 at 17:51
    
You need to compile it as gcc -pthread -o thread thread.c. Check your makefile. –  Salem May 31 '13 at 17:54
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closed as off topic by dobey, Radu Rădeanu, bcbc, Mitch, Uri Herrera May 31 '13 at 19:45

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2 Answers

up vote 2 down vote accepted

Did you forget to link a dynamic library?

cc thread.c -o thread -lpthread

Further errors:

  • type of pthread is pthread_t
  • you misspelled fun and func
  • no semicolon in function after printf
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thanks benjamin for help , it work but to be honest I don't understand what 'a dynamic library' mean I'll google it –  Engine May 31 '13 at 18:01
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According to the manual page for pthread_create and some sample code around the internet, the first parameter is a pointer to pthread_t, not pthread. Try that:

pthread_t tid;
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