Subj : _beginthread / _endthread
To   : borland.public.cpp.borlandcpp
From : M. Finch
Date : Mon Sep 06 2004 10:53 pm

Well, I'm REALLY confused on this one.  I'm taking code directly from the
Borland help file and it doesn't link.
I'm trying to start a separate thread in my program.
Here are the specifics:   XP, AMD3000+, BC++ 5.02, GUI for compile and link.
I WANT to do this with C++, but I'm trying it with C to figure how to do it
correctly first.

I get the following errors:

    Unresolved external '__threadid'
    Unresolved external '__endthread'
    Unresolved external '__beginthread'

Here is the code from the help file:

#include <stdio.h>
#include <errno.h>
#include <stddef.h>     /* _threadid variable */
#include <process.h>    /* _beginthread, _endthread */
#include <time.h>       /* time, _ctime */

void thread_code(void *threadno)
{
    time_t t;

    time(&t);
    printf("Executing thread number %d, ID = %d, time = %s\n",
        (int)threadno, _threadid, ctime(&t));
    _endthread();
}

void start_thread(int i)
{
    int thread_id;

#if     defined(__WIN32__)

    if ((thread_id = _beginthread(thread_code,4096,(void *)i)) == (unsigned
long)-1)
#else
    if ((thread_id = _beginthread(thread_code,4096,(void *)i)) == -1)
#endif
    {
        printf("Unable to create thread %d, errno = %d\n",i,errno);
        return;
    }
    printf("Created thread %d, ID = %ld\n",i,thread_id);
}

int main(void)
{
    int i;

    for (i = 1; i < 20; i++)
        start_thread(i);
    printf("Hit ENTER to exit main thread.\n");
    getchar();

    return 0;
}

Any help would be appreciated.  I'll bet there's a better, newer way of
doing threads, but this has me stumped!!

mfinch

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