Date: Thu, 27 Nov 2003 01:10:08 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: "sapdb@komadev.de" <kai@freshx.de> Cc: freebsd-threads@freebsd.org Subject: Re: Continous thread ids Message-ID: <Pine.GSO.4.10.10311270055110.15725-100000@pcnet5.pcnet.com> In-Reply-To: <1069892789.3fc544b58a2d7@localhost>
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On Thu, 27 Nov 2003, sapdb@komadev.de wrote:
> Hi,
>
> i wrote a little thread test programm. when i run it i get an output like
> ...
> 10 of 10 threads running, i am 0x8069000
> 10 of 10 threads running, i am 0x806c000
> 10 of 10 threads running, i am 0x806f000
> ...
>
> is there a generic way (not kse dependant), to get a still unique countinous
> thread id starting with 1,2 .... n ? With linuxthreads, it was possible by a
> dirty hack, masking out the upper 20 bit, but that seems not to be the way its
> meant to work huh ?
Yuk. If you want a portable method of getting continuous thread
ids, you shouldn't use the thread id. This is what pthread_key_create()
and pthread_[gs]et_specific() are for.
--
Dan Eischen
------
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#define MAXTHREADS 10
pthread_key_t key;
void *
threadedCounter(void *x)
{
int i;
pthread_setspecific(key, x);
for (i = 0; i < 10; i++) {
printf("%d of %d threads running, i am %p\n",
(int)pthread_getspecific(key), MAXTHREADS, pthread_self());
sleep(2);
}
return (NULL);
}
int
main(int argc, char *argv[])
{
pthread_t t;
int i;
pthread_key_create(&key, NULL);
for (i = 0; i < MAXTHREADS; i++)
pthread_create(&t, NULL, threadedCounter, (void *)i);
sleep(MAXTHREADS*3 + 2);
return (0);
}
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