Problem calling remote pthread function

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Hi all,

I wrote some code in C using pthread (I configured the linker and compiler in Eclipse IDE first).

#include <pthread.h>
#include "starter.h"
#include "UI.h"

Page* MM;
Page* Disk;
PCB* all_pcb_array;

void* display_prompt(void *id){

    printf("Hello111\n");

    return NULL;
}


int main(int argc, char** argv) {
    printf("Hello\n");
    pthread_t *thread = (pthread_t*) malloc (sizeof(pthread_t));
    pthread_create(thread, NULL, display_prompt, NULL);
    printf("Hello\n");
    return 1;
}

that works fine. However, when I move function display_prompt() to UI.h no "Hello111 " output is printed.

Anyone knows how to solve that?
Elad

Posted 21-May-10 23:44pm

elad2109

Updated 22-May-10 4:00am

Moak

v2

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CPallini · Answer 1 · 2010-05-24T21:14:00

elad2109 wrote:
However, when I move function display_prompt() to UI.h

You move...What?
You should move just the function prototype to the header file.

However, with the main you provided, the output is (almost) unpredictable, since the main function may exit well before the thread has a chance to produce its output.
Try this code:

C

/* ui.h */
void* display_prompt(void *id);

C

/* ui.c */
#include <stdio.h>
#include "ui.h"
void* display_prompt(void *id){
    int i;
    for (i=0;i<10; i++)
    {
      printf("Secondary thread %d\n", i);
      sleep(2);
    }
    return NULL;
}

C

/* main source file */
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include "ui.h"


int main(int argc, char** argv) {
    int i;
    printf("Hello\n");
    pthread_t *thread = (pthread_t*) malloc (sizeof(pthread_t));
    if (!thread ) return -1;
    pthread_create(thread, NULL, display_prompt, NULL);
    for (i=0; i<10; i++)
    {
      printf("Main Thread %d\n", i);
      sleep(1);
    }
    free(thread);
    return 1;
}

:)