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/* Create threads from multiple threads in parallel.
Copyright 2007-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <stdio.h>
#include <limits.h>
#define NUM_CREATE 1
#define NUM_THREAD 8
void *
thread_function (void *arg)
{
int x = * (int *) arg;
printf ("Thread <%d> executing\n", x);
return NULL;
}
void *
create_function (void *arg)
{
pthread_attr_t attr;
pthread_t threads[NUM_THREAD];
int args[NUM_THREAD];
int i = * (int *) arg;
int j;
pthread_attr_init (&attr); /* set breakpoint 1 here. */
pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
/* Create a ton of quick-executing threads, then wait for them to
complete. */
for (j = 0; j < NUM_THREAD; ++j)
{
args[j] = i * 1000 + j;
pthread_create (&threads[j], &attr, thread_function, &args[j]);
}
for (j = 0; j < NUM_THREAD; ++j)
pthread_join (threads[j], NULL);
pthread_attr_destroy (&attr);
return NULL;
}
int
main (int argc, char **argv)
{
pthread_attr_t attr;
pthread_t threads[NUM_CREATE];
int args[NUM_CREATE];
int n, i;
pthread_attr_init (&attr);
pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
for (n = 0; n < 100; ++n)
{
for (i = 0; i < NUM_CREATE; i++)
{
args[i] = i;
pthread_create (&threads[i], &attr, create_function, &args[i]);
}
create_function (&i);
for (i = 0; i < NUM_CREATE; i++)
pthread_join (threads[i], NULL);
}
pthread_attr_destroy (&attr);
return 0;
}
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