glib/gthread/tests/atomic.c

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2011-05-22 07:29:22 +02:00
/*
* Copyright 2011 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* See the included COPYING file for more information.
*/
#include <glib.h>
#define THREADS 10
#define ROUNDS 10000
volatile gint bucket[THREADS];
volatile gint atomic;
static gpointer
thread_func (gpointer data)
{
gint idx = GPOINTER_TO_INT (data);
gint i;
gint d;
for (i = 0; i < ROUNDS; i++)
{
d = g_random_int_range (-10, 100);
bucket[idx] += d;
g_atomic_int_add (&atomic, d);
g_thread_yield ();
}
return NULL;
}
static void
test_atomic (void)
{
gint sum;
gint i;
GThread *threads[THREADS];
atomic = 0;
for (i = 0; i < THREADS; i++)
bucket[i] = 0;
for (i = 0; i < THREADS; i++)
threads[i] = g_thread_create (thread_func, GINT_TO_POINTER (i), TRUE, NULL);
for (i = 0; i < THREADS; i++)
g_thread_join (threads[i]);
sum = 0;
for (i = 0; i < THREADS; i++)
sum += bucket[i];
g_assert_cmpint (sum, ==, atomic);
}
int
main (int argc, char *argv[])
{
g_thread_init (NULL);
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/glib/atomic/add", test_atomic);
return g_test_run ();
}