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/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/wait.h>
int *condition;
static int
do_test (void)
{
size_t ps = sysconf (_SC_PAGESIZE);
char tmpfname[] = "/tmp/tst-cond6.XXXXXX";
char data[ps];
void *mem;
int fd;
pthread_mutexattr_t ma;
pthread_mutex_t *mut1;
pthread_mutex_t *mut2;
pthread_condattr_t ca;
pthread_cond_t *cond;
pid_t pid;
int result = 0;
fd = mkstemp (tmpfname);
if (fd == -1)
{
printf ("cannot open temporary file: %m\n");
exit (1);
}
/* Make sure it is always removed. */
unlink (tmpfname);
/* Create one page of data. */
memset (data, '\0', ps);
/* Write the data to the file. */
if (write (fd, data, ps) != (ssize_t) ps)
{
puts ("short write");
exit (1);
}
mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED)
{
printf ("mmap failed: %m\n");
exit (1);
}
mut1 = (pthread_mutex_t *) (((uintptr_t) mem
+ __alignof (pthread_mutex_t))
& ~(__alignof (pthread_mutex_t) - 1));
mut2 = mut1 + 1;
cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1)
+ __alignof (pthread_cond_t))
& ~(__alignof (pthread_cond_t) - 1));
condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int))
& ~(__alignof (int) - 1));
if (pthread_mutexattr_init (&ma) != 0)
{
puts ("mutexattr_init failed");
exit (1);
}
if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0)
{
puts ("mutexattr_setpshared failed");
exit (1);
}
if (pthread_mutex_init (mut1, &ma) != 0)
{
puts ("1st mutex_init failed");
exit (1);
}
if (pthread_mutex_init (mut2, &ma) != 0)
{
puts ("2nd mutex_init failed");
exit (1);
}
if (pthread_condattr_init (&ca) != 0)
{
puts ("condattr_init failed");
exit (1);
}
if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0)
{
puts ("condattr_setpshared failed");
exit (1);
}
if (pthread_cond_init (cond, &ca) != 0)
{
puts ("cond_init failed");
exit (1);
}
if (pthread_mutex_lock (mut1) != 0)
{
puts ("parent: 1st mutex_lock failed");
exit (1);
}
puts ("going to fork now");
pid = fork ();
if (pid == -1)
{
puts ("fork failed");
exit (1);
}
else if (pid == 0)
{
struct timespec ts;
struct timeval tv;
if (pthread_mutex_lock (mut2) != 0)
{
puts ("child: mutex_lock failed");
exit (1);
}
if (pthread_mutex_unlock (mut1) != 0)
{
puts ("child: 1st mutex_unlock failed");
exit (1);
}
if (gettimeofday (&tv, NULL) != 0)
{
puts ("gettimeofday failed");
exit (1);
}
TIMEVAL_TO_TIMESPEC (&tv, &ts);
ts.tv_nsec += 500000000;
if (ts.tv_nsec >= 1000000000)
{
ts.tv_nsec -= 1000000000;
++ts.tv_sec;
}
do
if (pthread_cond_timedwait (cond, mut2, &ts) != 0)
{
puts ("child: cond_wait failed");
exit (1);
}
while (*condition == 0);
if (pthread_mutex_unlock (mut2) != 0)
{
puts ("child: 2nd mutex_unlock failed");
exit (1);
}
puts ("child done");
}
else
{
int status;
if (pthread_mutex_lock (mut1) != 0)
{
puts ("parent: 2nd mutex_lock failed");
exit (1);
}
if (pthread_mutex_lock (mut2) != 0)
{
puts ("parent: 3rd mutex_lock failed");
exit (1);
}
if (pthread_cond_signal (cond) != 0)
{
puts ("parent: cond_signal failed");
exit (1);
}
*condition = 1;
if (pthread_mutex_unlock (mut2) != 0)
{
puts ("parent: mutex_unlock failed");
exit (1);
}
puts ("waiting for child");
waitpid (pid, &status, 0);
result |= status;
puts ("parent done");
}
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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