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/* Tests process-shared barriers.
Copyright (C) 2002-2019 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
static int
do_test (void)
{
size_t ps = sysconf (_SC_PAGESIZE);
char tmpfname[] = "/tmp/tst-barrier2.XXXXXX";
char data[ps];
void *mem;
int fd;
pthread_barrier_t *b;
pthread_barrierattr_t a;
pid_t pid;
int serials = 0;
int cnt;
int status;
int p;
fd = mkstemp (tmpfname);
if (fd == -1)
{
printf ("cannot open temporary file: %m\n");
return 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");
return 1;
}
mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED)
{
printf ("mmap failed: %m\n");
return 1;
}
b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
& ~(__alignof (pthread_barrier_t) - 1));
if (pthread_barrierattr_init (&a) != 0)
{
puts ("barrierattr_init failed");
return 1;
}
if (pthread_barrierattr_getpshared (&a, &p) != 0)
{
puts ("1st barrierattr_getpshared failed");
return 1;
}
if (p != PTHREAD_PROCESS_PRIVATE)
{
puts ("default pshared value wrong");
return 1;
}
if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
{
puts ("barrierattr_setpshared failed");
return 1;
}
if (pthread_barrierattr_getpshared (&a, &p) != 0)
{
puts ("2nd barrierattr_getpshared failed");
return 1;
}
if (p != PTHREAD_PROCESS_SHARED)
{
puts ("pshared value after setpshared call wrong");
return 1;
}
if (pthread_barrier_init (b, &a, 2) != 0)
{
puts ("barrier_init failed");
return 1;
}
if (pthread_barrierattr_destroy (&a) != 0)
{
puts ("barrierattr_destroy failed");
return 1;
}
puts ("going to fork now");
pid = fork ();
if (pid == -1)
{
puts ("fork failed");
return 1;
}
/* Just to be sure we don't hang forever. */
alarm (4);
#define N 30
for (cnt = 0; cnt < N; ++cnt)
{
int e;
e = pthread_barrier_wait (b);
if (e == PTHREAD_BARRIER_SERIAL_THREAD)
++serials;
else if (e != 0)
{
printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n",
pid == 0 ? "child" : "parent", e);
return 1;
}
}
alarm (0);
printf ("%s: was %d times the serial thread\n",
pid == 0 ? "child" : "parent", serials);
if (pid == 0)
/* The child. Pass the number of times we had the serializing
thread back to the parent. */
exit (serials);
if (waitpid (pid, &status, 0) != pid)
{
puts ("waitpid failed");
return 1;
}
if (!WIFEXITED (status))
{
puts ("child exited abnormally");
return 1;
}
if (WEXITSTATUS (status) + serials != N)
{
printf ("total number of serials is %d, expected %d\n",
WEXITSTATUS (status) + serials, N);
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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