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C threads

Discussion in 'C' started by sudu, Sep 7, 2006.

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  1. sudu

    sudu New Member

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    I was trying to create threads in my code. This is the first time I tried this I used these as reference
    http://www.opengroup.org/onlinepubs/007908799/xsh/pthread_create.html
    and
    http://www.mit.edu:8001/people/proven/IAP_2000/basic_example.html

    but I always get a error message saying

    engine_driver.o: In function `e_admit_to_engine':/home/shahan/engine_driver.c:39: undefined reference to `pthread_create'
    :/home/shahan/engine_driver.c:43: undefined reference to `pthread_detach'
    collect2: ld returned 1 exit status

    it doesnt recognize the functins

    can any one help me on this??? :confused:

    I enterd the code here (only the part I use threads. I return NULL in engine_ex_comm_write )


    Code:
     
    #include <pthread.h>
    #include "engine.h"
    
    void * engine_ex_comm_read(profile_t *data);
    void * engine_ex_comm_write(profile_t *data);
    int e_admit_engine();
    
    
    int e_admit_to_engine()
    {
    
       profile_t *this_data;
       //extern void * start_routine(void *ths_data);
       //char * this_data1;
       profile_t *new_profile;
       element_t *new_element, *new_element1;
       profile_t * loc;
       int y=0, x, ret;
       pthread_t tid;
       pthread_attr_t attr;
    
       while(1)
       {
          if(y!=is_buffer_emty())
          {
              this_data= read_from_buffer();
    
              if(this_data)
              {
                 engine_ex_comm_write(this_data);
                 if( pthread_create(&tid, NULL, engine_ex_comm_write, this_data))
                 {
                    printf("error creating thread\n");
                 }
                 pthread_detach(tid);
              }
    
     
  2. shabbir

    shabbir Administrator Staff Member

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