Re: Problem with Native POSIX Thread Library

[Lawrence Bowie <ldb@ldb-jab.org>]

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These modifications below might shed some light on your issue.

LDB

- ------------------- CODE ---------------------------
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include <string.h>

#define MAX 10000

void print_msg(void * msg);
int main(void);

void print_msg(void * arg)
{
    pthread_detach(pthread_self());
    sleep(10);
    pthread_exit(NULL);
}

int main(void)
{
    pthread_t thread_id[MAX];
    int i, ret, err;

    for (i = 0; i < MAX; i++)
    {
          ret = pthread_create(&thread_id[i], NULL, (void *)&print_msg,
(void *)0);

          if (ret) {
              err = errno;
              printf("Error creating thread %d: %s\n", i,strerror(err));
          }
     }

    pthread_exit(NULL);
}
- ----------------------- CODE -------------------------------

Mikado wrote:
> Hi all,
> 
> I'm using 2.6 kernel with NPTL support in kernel and libc but I cannot create more than 400
> threads with NPTL. In the past, I used 2.4 kernel and I can create about 1500 threads. I dont want
> to use traditional LinuxThread because I dont like the way it pthread_detach() (it "clone"s too
> many processes). Reading some documents about NPTL, I thought it can creates many threads but it's
> not true in my case. I need somebody's help. Thanks in adv.
> 
> System info:
> - Kernel: 2.6.13.4
> - RAM: 256 + 128
> - CPU: PentiumIII 937.939MHz
> 
> My code is below:
> 
> ===== CODE =====
> #include <stdio.h>
> #include <unistd.h>
> #include <pthread.h>
> 
> #define MAX 10000
> 
> void print_msg(void * msg);
> int main(void);
> 
> void print_msg(void * arg)
> {
>         pthread_detach(pthread_self());
>         sleep(10);
>         pthread_exit(NULL);
> }
> 
> int main(void)
> {
>         pthread_t thread_id[MAX];
>         int i, ret;
> 
>         for (i = 0; i < MAX; i++)
>         {
>                 ret = pthread_create(&thread_id[i], NULL, (void *)&print_msg, (void *)0);
>                 if (ret)
>                         printf("Error creating thread %d\n", i);
>         }
> 
>         pthread_exit(NULL);
> }
> ===== CODE =====
> 
> 
> 
> 		
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