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glib/tests/refcount.c
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glib/tests/refcount.c
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/* refcount.c: Tests for reference counting types
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*
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* Copyright 2018 Emmanuele Bassi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <glib.h>
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/* test_grefcount: test the behavior of the grefcount API */
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static void
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test_grefcount (void)
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{
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grefcount a, b;
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/* init(a): 1 */
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g_ref_count_init (&a);
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if (g_test_verbose ())
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g_test_message ("init(a) := %d\n", (int) a);
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g_assert_true (g_ref_count_compare (&a, 1));
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/* inc(a): 2 */
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g_ref_count_inc (&a);
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if (g_test_verbose ())
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g_test_message ("inc(a) := %d\n", (int) a);
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g_assert_false (g_ref_count_compare (&a, 1));
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g_assert_false (g_ref_count_compare (&a, G_MAXINT));
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/* b = a = 2 */
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b = a;
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if (g_test_verbose ())
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g_test_message ("a := %d, b := %d\n", (int) a, (int) b);
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/* inc(a): 3 */
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g_ref_count_inc (&a);
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if (g_test_verbose ())
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g_test_message ("inc(a) := %d\n", (int) a);
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/* dec(b) = 1 */
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if (g_test_verbose ())
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g_test_message ("dec(b) := %d + 1\n", (int) b);
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g_assert_false (g_ref_count_dec (&b));
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/* dec(a) = 2 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_false (g_ref_count_dec (&a));
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/* dec(b) = 0 */
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if (g_test_verbose ())
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g_test_message ("dec(b) := %d + 1\n", (int) b);
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g_assert_true (g_ref_count_dec (&b));
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/* dec(a) = 1 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_false (g_ref_count_dec (&a));
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/* dec(a) = 0 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_true (g_ref_count_dec (&a));
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}
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/* test_grefcount_saturation: Saturating a grefcount counter
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* does not cause an overflow; additionally, if we're building
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* with checks enabled or with non-GCC compilers, it'll cause a
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* warning
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*/
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static void
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test_grefcount_saturation (void)
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{
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if (g_test_subprocess ())
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{
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grefcount a;
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/* We're breaking abstraction here for convenience */
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a = G_MININT + 1;
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g_ref_count_inc (&a);
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g_assert_true (a == G_MININT);
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g_ref_count_inc (&a);
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g_assert_true (a == G_MININT);
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exit (0);
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}
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g_test_trap_subprocess (NULL, 0, 0);
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#if defined (G_DISABLE_CHECKS) && defined (__GNUC__)
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/* With checks disabled we don't get any warning */
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g_test_trap_assert_passed ();
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#else
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/* Ensure that we got a warning when building with checks or with
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* non-GCC compilers; the test will fail because of the critical
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* warning being caught by GTest
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*/
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g_test_trap_assert_failed ();
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g_test_trap_assert_stderr ("*saturation*");
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#endif
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}
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/* test_gatomicrefcount: test the behavior of the gatomicrefcount API */
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static void
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test_gatomicrefcount (void)
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{
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gatomicrefcount a, b;
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/* init(a): 1 */
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g_atomic_ref_count_init (&a);
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if (g_test_verbose ())
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g_test_message ("init(a) := %d\n", (int) a);
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g_assert_true (g_atomic_ref_count_compare (&a, 1));
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/* inc(a): 2 */
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g_atomic_ref_count_inc (&a);
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if (g_test_verbose ())
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g_test_message ("inc(a) := %d\n", (int) a);
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g_assert_false (g_atomic_ref_count_compare (&a, 1));
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g_assert_false (g_atomic_ref_count_compare (&a, G_MAXINT));
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/* b = a = 2 */
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b = a;
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if (g_test_verbose ())
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g_test_message ("a := %d, b := %d\n", (int) a, (int) b);
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/* inc(a): 3 */
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g_atomic_ref_count_inc (&a);
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if (g_test_verbose ())
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g_test_message ("inc(a) := %d\n", (int) a);
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/* dec(b) = 1 */
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if (g_test_verbose ())
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g_test_message ("dec(b) := %d + 1\n", (int) b);
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g_assert_false (g_atomic_ref_count_dec (&b));
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/* dec(a) = 2 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_false (g_atomic_ref_count_dec (&a));
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/* dec(b) = 0 */
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if (g_test_verbose ())
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g_test_message ("dec(b) := %d + 1\n", (int) b);
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g_assert_true (g_atomic_ref_count_dec (&b));
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/* dec(a) = 1 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_false (g_atomic_ref_count_dec (&a));
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/* dec(a) = 0 */
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if (g_test_verbose ())
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g_test_message ("dec(a) := %d + 1\n", (int) a);
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g_assert_true (g_atomic_ref_count_dec (&a));
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}
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/* test_gatomicrefcount_saturation: Saturating a gatomicrefcount counter
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* does not cause an overflow; additionally, if we're building with
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* checks enabled or with non-GCC compilers, it'll cause a warning
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*/
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static void
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test_gatomicrefcount_saturation (void)
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{
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if (g_test_subprocess ())
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{
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gatomicrefcount a;
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/* We're breaking abstraction here for convenience */
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a = G_MAXINT - 1;
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g_atomic_ref_count_inc (&a);
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g_assert_true (a == G_MAXINT);
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g_atomic_ref_count_inc (&a);
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g_assert_true (a == G_MAXINT);
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exit (0);
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}
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g_test_trap_subprocess (NULL, 0, 0);
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#if defined (G_DISABLE_CHECKS) && defined (__GNUC__)
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/* With checks disabled we don't get any warning */
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g_test_trap_assert_passed ();
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#else
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/* Ensure that we got a warning when building with checks or with
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* non-GCC compilers; the test will fail because of the critical
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* warning being caught by GTest
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*/
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g_test_trap_assert_failed ();
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g_test_trap_assert_stderr ("*saturation*");
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#endif
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}
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int
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main (int argc,
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char *argv[])
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{
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g_test_init (&argc, &argv, NULL);
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g_test_add_func ("/refcount/grefcount", test_grefcount);
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g_test_add_func ("/refcount/grefcount/saturation", test_grefcount_saturation);
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g_test_add_func ("/refcount/gatomicrefcount", test_gatomicrefcount);
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g_test_add_func ("/refcount/gatomicrefcount/saturation", test_gatomicrefcount_saturation);
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return g_test_run ();
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}
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