1 /* Copyright (c) 1998, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include <unistd.h>
20 #include <stdlib.h>
21 #include <sys/time.h>
22 #include "rpc_private.h"
23
24
25 /* The RPC code is not threadsafe, but new code should be threadsafe. */
26
27 #include <bits/uClibc_mutex.h>
28 __UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);
29
30 static smallint is_initialized;
31 static struct drand48_data __rpc_lrand48_data;
32
_create_xid(void)33 u_long _create_xid (void)
34 {
35 long res;
36
37 __UCLIBC_MUTEX_LOCK(mylock);
38
39 if (!is_initialized)
40 {
41 struct timeval now;
42
43 gettimeofday (&now, (struct timezone *) 0);
44 srand48_r (now.tv_sec ^ now.tv_usec, &__rpc_lrand48_data);
45 is_initialized = 1;
46 }
47
48 lrand48_r (&__rpc_lrand48_data, &res);
49
50 __UCLIBC_MUTEX_UNLOCK(mylock);
51
52 return res;
53 }
54