189 lines
3.9 KiB
C
189 lines
3.9 KiB
C
/* Copyright (C) 2002-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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-rwlock4.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_rwlock_t *r;
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pthread_rwlockattr_t a;
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pid_t pid;
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char *p;
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int err;
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int s;
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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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r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t))
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& ~(__alignof (pthread_rwlock_t) - 1));
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p = (char *) (r + 1);
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if (pthread_rwlockattr_init (&a) != 0)
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{
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puts ("rwlockattr_init failed");
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return 1;
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}
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if (pthread_rwlockattr_getpshared (&a, &s) != 0)
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{
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puts ("1st rwlockattr_getpshared failed");
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return 1;
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}
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if (s != 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_rwlockattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
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{
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puts ("rwlockattr_setpshared failed");
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return 1;
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}
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if (pthread_rwlockattr_getpshared (&a, &s) != 0)
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{
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puts ("2nd rwlockattr_getpshared failed");
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return 1;
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}
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if (s != 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_rwlock_init (r, &a) != 0)
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{
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puts ("rwlock_init failed");
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return 1;
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}
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if (pthread_rwlock_rdlock (r) != 0)
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{
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puts ("rwlock_rdlock failed");
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return 1;
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}
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if (pthread_rwlockattr_destroy (&a) != 0)
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{
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puts ("rwlockattr_destroy failed");
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return 1;
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}
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err = pthread_rwlock_trywrlock (r);
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if (err == 0)
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{
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puts ("rwlock_trywrlock succeeded");
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return 1;
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}
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else if (err != EBUSY)
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{
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puts ("rwlock_trywrlock didn't return EBUSY");
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return 1;
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}
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*p = 0;
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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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else if (pid == 0)
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{
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/* Play some lock ping-pong. It's our turn to unlock first. */
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if ((*p)++ != 0)
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{
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puts ("child: *p != 0");
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return 1;
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}
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if (pthread_rwlock_unlock (r) != 0)
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{
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puts ("child: 1st rwlock_unlock failed");
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return 1;
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}
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puts ("child done");
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}
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else
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{
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if (pthread_rwlock_wrlock (r) != 0)
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{
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puts ("parent: rwlock_wrlock failed");
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return 1;
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}
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if (*p != 1)
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{
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puts ("*p != 1");
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return 1;
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}
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puts ("parent done");
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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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