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/* Test the allocate_once function.
Copyright (C) 2018-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <allocate_once.h>
#include <mcheck.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
/* Allocate a new string. */
static void *
allocate_string (void *closure)
{
return xstrdup (closure);
}
/* Allocation and deallocation functions which are not expected to be
called. */
static void *
allocate_not_called (void *closure)
{
FAIL_EXIT1 ("allocation function called unexpectedly (%p)", closure);
}
static void
deallocate_not_called (void *closure, void *ptr)
{
FAIL_EXIT1 ("deallocate function called unexpectedly (%p, %p)",
closure, ptr);
}
/* Counter for various function calls. */
static int function_called;
/* An allocation function which returns NULL and records that it has
been called. */
static void *
allocate_return_null (void *closure)
{
/* The function should only be called once. */
TEST_COMPARE (function_called, 0);
++function_called;
return NULL;
}
/* The following is used to check the retry logic, by causing a fake
race condition. */
static void *fake_race_place;
static char fake_race_region[3]; /* To obtain unique addresses. */
static void *
fake_race_allocate (void *closure)
{
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 0);
++function_called;
/* Fake allocation by another thread. */
fake_race_place = &fake_race_region[1];
return &fake_race_region[2];
}
static void
fake_race_deallocate (void *closure, void *ptr)
{
/* Check that the pointer returned from fake_race_allocate is
deallocated (and not the one stored in fake_race_place). */
TEST_VERIFY (ptr == &fake_race_region[2]);
TEST_VERIFY (fake_race_place == &fake_race_region[1]);
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 1);
++function_called;
}
/* Similar to fake_race_allocate, but expects to be paired with free
as the deallocation function. */
static void *
fake_race_allocate_for_free (void *closure)
{
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 0);
++function_called;
/* Fake allocation by another thread. */
fake_race_place = &fake_race_region[1];
return xstrdup ("to be freed");
}
static int
do_test (void)
{
mtrace ();
/* Simple allocation. */
void *place1 = NULL;
char *string1 = allocate_once (&place1, allocate_string,
deallocate_not_called,
(char *) "test string 1");
TEST_VERIFY_EXIT (string1 != NULL);
TEST_VERIFY (strcmp ("test string 1", string1) == 0);
/* Second call returns the first pointer, without calling any
callbacks. */
TEST_VERIFY (string1
== allocate_once (&place1, allocate_not_called,
deallocate_not_called,
(char *) "test string 1a"));
/* Different place should result in another call. */
void *place2 = NULL;
char *string2 = allocate_once (&place2, allocate_string,
deallocate_not_called,
(char *) "test string 2");
TEST_VERIFY_EXIT (string2 != NULL);
TEST_VERIFY (strcmp ("test string 2", string2) == 0);
TEST_VERIFY (string1 != string2);
/* Check error reporting (NULL return value from the allocation
function). */
void *place3 = NULL;
char *string3 = allocate_once (&place3, allocate_return_null,
deallocate_not_called, NULL);
TEST_VERIFY (string3 == NULL);
TEST_COMPARE (function_called, 1);
/* Check that the deallocation function is called if the race is
lost. */
function_called = 0;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate,
fake_race_deallocate,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 2);
function_called = 3;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate,
fake_race_deallocate,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 3);
/* Similar, but this time rely on that free is called. */
function_called = 0;
fake_race_place = NULL;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate_for_free,
NULL,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 1);
function_called = 3;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate_for_free,
NULL,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 3);
free (place2);
free (place1);
return 0;
}
#include <support/test-driver.c>
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