1 /*****************************************************************************
2 * vlc_gcrypt.h: VLC thread support for gcrypt
3 *****************************************************************************
4 * Copyright (C) 2004-2008 RĂ©mi Denis-Courmont
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
19 *****************************************************************************/
23 * This file implements gcrypt support functions in vlc
26 #ifdef LIBVLC_USE_PTHREAD
28 * If possible, use gcrypt-provided thread implementation. This is so that
29 * other non-VLC components (inside the process) can also use gcrypt safely.
31 GCRY_THREAD_OPTION_PTHREAD_IMPL;
32 # define gcry_threads_vlc gcry_threads_pthread
36 * gcrypt thread option VLC implementation
39 static int gcry_vlc_mutex_init( void **p_sys )
41 vlc_mutex_t *p_lock = (vlc_mutex_t *)malloc( sizeof( vlc_mutex_t ) );
45 vlc_mutex_init( p_lock );
50 static int gcry_vlc_mutex_destroy( void **p_sys )
52 vlc_mutex_t *p_lock = (vlc_mutex_t *)*p_sys;
53 vlc_mutex_destroy( p_lock );
58 static int gcry_vlc_mutex_lock( void **p_sys )
60 vlc_mutex_lock( (vlc_mutex_t *)*p_sys );
64 static int gcry_vlc_mutex_unlock( void **lock )
66 vlc_mutex_unlock( (vlc_mutex_t *)*lock );
70 static const struct gcry_thread_cbs gcry_threads_vlc =
72 GCRY_THREAD_OPTION_USER,
75 gcry_vlc_mutex_destroy,
82 * Initializes gcrypt with proper locking.
84 static inline void vlc_gcrypt_init (void)
86 /* This would need a process-wide static mutex with all libraries linking
87 * to a given instance of libgcrypt. We cannot do this as we have different
88 * plugins linking with gcrypt, and some underlying libraries may use it
89 * behind our back. Only way is to always link gcrypt statically (ouch!) or
90 * have upstream gcrypt provide one shared object per threading system. */
91 static vlc_mutex_t lock = VLC_STATIC_MUTEX;
92 static bool done = false;
94 vlc_mutex_lock (&lock);
97 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_vlc);
100 vlc_mutex_unlock (&lock);