/* Copyright (C) 2002 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 <pthread.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/file.h> static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static int fd; static void * tf (void *arg) { if (flock (fd, LOCK_SH | LOCK_NB) != 0) { puts ("second flock failed"); exit (1); } pthread_mutex_unlock (&lock); return NULL; } static int do_test (void) { char tmp[] = "/tmp/tst-flock1-XXXXXX"; fd = mkstemp (tmp); if (fd == -1) { puts ("mkstemp failed"); exit (1); } unlink (tmp); write (fd, "foobar xyzzy", 12); if (flock (fd, LOCK_EX | LOCK_NB) != 0) { puts ("first flock failed"); exit (1); } pthread_mutex_lock (&lock); pthread_t th; if (pthread_create (&th, NULL, tf, NULL) != 0) { puts ("pthread_create failed"); exit (1); } pthread_mutex_lock (&lock); void *result; if (pthread_join (th, &result) != 0) { puts ("pthread_join failed"); exit (1); } close (fd); return result != NULL; } #define TEST_FUNCTION do_test () #include "../test-skeleton.c"