Task threading question

[Stefan Bruda]

At 15:43 -0500 on 2004-2-6 Duke Robillard wrote:
 >
 > threads and processes are both still KSEs created by clone().

Here is proof: the following 11-thread program brings both processors
on my dual G5 to 100% load, as in

CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total  198.6%    0.0%    1.4%   0.0%     0.0%    0.0%    0.0%
           cpu00   98.6%    0.0%    1.4%   0.0%     0.0%    0.0%    0.0%
           cpu01  100.0%    0.0%    0.0%   0.0%     0.0%    0.0%    0.0%

It is always fun to see a 200% load. :-)

#include <pthread.h>

void* do_nothing (void* ignore) {
    while(1);
}

int main (int argc, char** argv) {

    pthread_t tt;
    pthread_attr_t ta;
    pthread_attr_init(&ta);
    pthread_attr_setdetachstate(&ta,PTHREAD_CREATE_DETACHED);    
    int i;
    for (i = 0; i < 10; i++) {
        if ( pthread_create(&tt, &ta, do_nothing, 0) != 0 ) {
            perror("pthread_create");
            return 1;
        }
    }
    while(1);
}


-- 
If it was so, it might be; and if it were so, it would be; but as
it isn't, it ain't. That's logic.
    --Lewis Carroll, Through the Looking-Glass