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#define _GNU_SOURCE
#include <pthread.h>
#include <assert.h>
#include <error.h>
#include <errno.h>
#define THREADS 10
pthread_once_t inc_var_once = PTHREAD_ONCE_INIT;
int var;
void
inc_var (void)
{
var ++;
}
void *
thr (void *arg)
{
int i;
for (i = 0; i < 500; i ++)
pthread_once (&inc_var_once, inc_var);
return 0;
}
int
main (int argc, char **argv)
{
error_t err;
int i;
pthread_t tid[THREADS];
for (i = 0; i < THREADS; i ++)
{
err = pthread_create (&tid[i], 0, thr, 0);
if (err)
error (1, err, "pthread_create (%d)", i);
}
assert (thr (0) == 0);
for (i = 0; i < THREADS; i ++)
{
void *ret;
err = pthread_join (tid[i], &ret);
if (err)
error (1, err, "pthread_join");
assert (ret == 0);
}
assert (var == 1);
return 0;
}
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