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/* Tests process-shared barriers.
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Copyright (C) 2002-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C 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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The GNU C 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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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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static int
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do_test (void)
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{
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size_t ps = sysconf (_SC_PAGESIZE);
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char tmpfname[] = "/tmp/tst-barrier2.XXXXXX";
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char data[ps];
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void *mem;
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int fd;
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pthread_barrier_t *b;
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pthread_barrierattr_t a;
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pid_t pid;
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int serials = 0;
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int cnt;
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int status;
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int p;
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fd = mkstemp (tmpfname);
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if (fd == -1)
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{
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printf ("cannot open temporary file: %m\n");
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return 1;
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}
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/* Make sure it is always removed. */
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unlink (tmpfname);
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/* Create one page of data. */
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memset (data, '\0', ps);
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/* Write the data to the file. */
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if (write (fd, data, ps) != (ssize_t) ps)
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{
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puts ("short write");
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return 1;
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}
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mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (mem == MAP_FAILED)
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{
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printf ("mmap failed: %m\n");
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return 1;
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}
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b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
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& ~(__alignof (pthread_barrier_t) - 1));
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if (pthread_barrierattr_init (&a) != 0)
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{
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puts ("barrierattr_init failed");
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return 1;
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}
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if (pthread_barrierattr_getpshared (&a, &p) != 0)
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{
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puts ("1st barrierattr_getpshared failed");
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return 1;
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}
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if (p != PTHREAD_PROCESS_PRIVATE)
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{
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puts ("default pshared value wrong");
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return 1;
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}
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if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
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{
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puts ("barrierattr_setpshared failed");
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return 1;
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}
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if (pthread_barrierattr_getpshared (&a, &p) != 0)
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{
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puts ("2nd barrierattr_getpshared failed");
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return 1;
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}
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if (p != PTHREAD_PROCESS_SHARED)
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{
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puts ("pshared value after setpshared call wrong");
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return 1;
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}
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if (pthread_barrier_init (b, &a, 2) != 0)
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{
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puts ("barrier_init failed");
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return 1;
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}
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if (pthread_barrierattr_destroy (&a) != 0)
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{
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puts ("barrierattr_destroy failed");
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return 1;
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}
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puts ("going to fork now");
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pid = fork ();
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if (pid == -1)
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{
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puts ("fork failed");
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return 1;
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}
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/* Just to be sure we don't hang forever. */
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alarm (4);
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#define N 30
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for (cnt = 0; cnt < N; ++cnt)
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{
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int e;
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e = pthread_barrier_wait (b);
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if (e == PTHREAD_BARRIER_SERIAL_THREAD)
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++serials;
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else if (e != 0)
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{
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printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n",
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pid == 0 ? "child" : "parent", e);
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return 1;
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}
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}
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alarm (0);
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printf ("%s: was %d times the serial thread\n",
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pid == 0 ? "child" : "parent", serials);
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if (pid == 0)
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/* The child. Pass the number of times we had the serializing
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thread back to the parent. */
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exit (serials);
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if (waitpid (pid, &status, 0) != pid)
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{
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puts ("waitpid failed");
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return 1;
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}
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if (!WIFEXITED (status))
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{
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puts ("child exited abnormally");
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return 1;
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}
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if (WEXITSTATUS (status) + serials != N)
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{
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printf ("total number of serials is %d, expected %d\n",
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WEXITSTATUS (status) + serials, N);
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return 1;
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}
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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