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/* Multithread-safety test for localtime_r().
Copyright (C) 2024-2025 Free Software Foundation, Inc.
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 <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
#include <config.h>
/* Work around GCC bug 44511. */
#if _GL_GNUC_PREREQ (4, 3)
# pragma GCC diagnostic ignored "-Wreturn-type"
#endif
#if USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS
/* Specification. */
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include "glthread/thread.h"
#include "macros.h"
/* Some common time zone name. */
#if defined _WIN32 && !defined __CYGWIN__
/* Cf. <https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/default-time-zones>
or <https://ss64.com/timezones.html> */
# define FRENCH_TZ "Romance Standard Time"
#else
/* Cf. <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones> */
# define FRENCH_TZ "Europe/Paris"
#endif
static void *
thread1_func (void *arg)
{
for (;;)
{
time_t t = 1178467200; /* 2007-05-06 18:00:00 */
struct tm tm;
struct tm *result = localtime_r (&t, &tm);
ASSERT (result == &tm);
if (!(result->tm_sec == 0
&& result->tm_min == 0
&& result->tm_hour == 18
&& result->tm_mday == 6
&& result->tm_mon == 5 - 1
&& result->tm_year == 2007 - 1900
&& result->tm_wday == 0
&& result->tm_yday == 125
&& result->tm_isdst == 1))
{
fprintf (stderr, "thread1 disturbed by thread2!\n"); fflush (stderr);
abort ();
}
}
/*NOTREACHED*/
}
static void *
thread2_func (void *arg)
{
for (;;)
{
time_t t = 1336320000; /* 2012-05-06 18:00:00 */
struct tm tm;
struct tm *result = localtime_r (&t, &tm);
ASSERT (result == &tm);
if (!(result->tm_sec == 0
&& result->tm_min == 0
&& result->tm_hour == 18
&& result->tm_mday == 6
&& result->tm_mon == 5 - 1
&& result->tm_year == 2012 - 1900
&& result->tm_wday == 0
&& result->tm_yday == 126
&& result->tm_isdst == 1))
{
fprintf (stderr, "thread2 disturbed by thread1!\n"); fflush (stderr);
abort ();
}
}
/*NOTREACHED*/
}
int
main (int argc, char *argv[])
{
setenv ("TZ", FRENCH_TZ, 1);
/* Check that this TZ works. */
{
time_t t = 0; /* 1970-01-01 01:00:00 */
struct tm *result = localtime (&t);
if (! (result
&& result->tm_sec == 0
&& result->tm_min == 0
&& result->tm_hour == 1
&& result->tm_mday == 1
&& result->tm_mon == 1 - 1
&& result->tm_year == 1970 - 1900
&& result->tm_wday == 4
&& result->tm_yday == 0
&& result->tm_isdst == 0))
{
fputs ("Skipping test: TZ='" FRENCH_TZ "' is not Paris time\n",
stderr);
return 77;
}
}
/* Create the threads. */
gl_thread_create (thread1_func, NULL);
gl_thread_create (thread2_func, NULL);
/* Let them run for 1 second. */
{
struct timespec duration;
duration.tv_sec = (argc > 1 ? atoi (argv[1]) : 1);
duration.tv_nsec = 0;
nanosleep (&duration, NULL);
}
return test_exit_status;
}
#else
/* No multithreading available. */
#include <stdio.h>
int
main ()
{
fputs ("Skipping test: multithreading not enabled\n", stderr);
return 77;
}
#endif
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