Subj : Re: _beginthread / _endthread
To   : borland.public.cpp.borlandcpp
From : Ed Mulroy [TeamB]
Date : Tue Sep 07 2004 08:21 am

The errors sound as if the project is set up as single threaded and 
not as multi-threaded.

..  Ed

> M. Finch wrote in message
> news:413d227d$1@newsgroups.borland.com...
>
> 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!!

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