seg fault on kse_release () (fwd)

[Yan Yu]

Cool, Thanks A LOT for looking into this! I appreciate it!
after I reduce the BSIZE to 50k, it can create more than 10k threads
before calloc error.. so i am going to drop this thread:)
(just fyi, i use your prog on our machine w/ BSIZE =500k
(~512M Ram), again i got SEG fault before the calloc error after it
creates 913 threads, this number is repeatable..  so it is wierd..
as suggested by others, it might be a lib related prob., we may use a diff
lib etc..
i am going to look into this later..

Thanks again!
yan

On Tue, 25 Jan 2005, Jose Hidalgo Herrera wrote:

> This is my last try!, it worked for me, I reached a little more that
> 1000 threads, then I got the calloc error.
> :-)
>
>
>
>
>
> #include <pthread.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <assert.h>
>
> #define NUM_THREADS     5000
> #define THREADS_IN_ONE_PROCESS  5
> #define BSIZE  500000
>
> static int  cc;
>
> void *PrintHello(void *);
>
> pthread_mutex_t mtx;
>
> void CreateThread(int n, int myid)
> {
>    int rc, t;
>    unsigned long id;
>         char * p;
>    pthread_t threads[NUM_THREADS];
>    assert( n <= NUM_THREADS );
>    for(t=0;t < n;t++){
>       printf("id:%d Creating thread %d\n",myid,t);
>       rc = pthread_create(&threads[t], NULL, PrintHello, NULL);
>       if (rc){
>          printf("ERROR; return code from pthread_create() is %d\n", rc);
>       }
>    }
>
>    pthread_mutex_lock(&mtx);
>    p = (char *) calloc(BSIZE, sizeof(char) );
>    if ( p == NULL )
>    {
>         pthread_mutex_unlock(&mtx);
> 	perror("calloc");
> 	pthread_exit(NULL);
>    }
>    pthread_mutex_unlock(&mtx);
>
>    while (1)
>    {
>         while (BSIZE <= (id = rand() / (RAND_MAX/BSIZE)));
>         p[id] ++;
>    }
> }
>
>
> void *PrintHello(void * threadid)
> {
>    int * myid=NULL;
>
>         pthread_mutex_lock(&mtx);
>         myid=(int *)malloc(sizeof(int));
>         if (myid==NULL){
>       		pthread_mutex_unlock(&mtx);
>                 perror("malloc");
>                 pthread_exit(NULL);
>         }
>         *myid= cc++;
>         pthread_mutex_unlock(&mtx);
>
>
>    printf("\n%d: Hello World!\n", *myid);
>    CreateThread(THREADS_IN_ONE_PROCESS,*myid);
>    pthread_exit(NULL);
> }
>
> int main (int argc, char *argv[])
> {
>         pthread_mutex_init(&mtx, NULL);
> 	CreateThread(THREADS_IN_ONE_PROCESS,0);
>         pthread_mutex_destroy(&mtx);
> }
>
>
>