🚀 go-pugleaf

Hi everyone,

I have trouble compile a Posix Thread example on Linux (kernel 2.0.0).

I believe my working environment is not setup correctly, can anyone give
some direction please?

I found pthread.h in \usr\include directory.
This pthread is somehow linked to \usr\include\mit\pthread???
I could not find any library file for linking.

Here is an example I try to compile.....

======================================================

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#include <varargs.h>  /* for errexit */
#include <sys/types.h>
#include <time.h>   /* for time */
#include <math.h>

void *print_name(void *args)
{
 double div=10;
 int i;
 for(i=0;i<1000;i++)
 {
  div = div*M_PI;
  div = div/(M_PI*i);
 }
 pthread_exit;
}


int errexit(format,va_alist)
char    *format;
va_dcl
{
 va_list args;
 va_start(args);
 _doprnt(format,args,stderr);
 va_end(args);
 exit(1);
}


/*MAIN*/

int main(argc,argv)
 int argc;
 char *argv[];
{
 int threads;
 int i;
 pthread_t *tid;   /* pointer to thread id array */
 time_t clock=1;
 double now;



 if (argc < 2)
 {
  errexit("Usage : %s threads\n",argv[0]);
 }
 srand(getpid());

 threads = atoi(argv[1]);

 /* create the array of holders for the thread ids */
 if (( tid = (pthread_t *) calloc(threads,sizeof(pthread_t))) == NULL)
  errexit("Unable to calloc memory\n",threads);

 now = time(&clock);
 printf("%f\n",now);
 for(i=0;i<threads;i++)
 {
  if (pthread_create((tid+i),NULL,print_name,NULL))
   errexit("Could not create thread %i : %s\n",i,strerror(errno));
 }

 /* wait for all threads to finish */

 for (i=0;i<threads;i++)
  pthread_join(*(tid+i),NULL);
 now = time(&clock);
 printf("%f\n",now);
 pthread_exit;
}

===========================================

If someone could tell me the compiler switch to use, to file to look for
or any FAQ to do with Posix thread programming in Linux environment, I
am very much appreciated.

--
Regards,
Vi Nham   (vnham@socs.uts.edu.au)