mirror of
https://code.videolan.org/videolan/vlc
synced 2024-10-03 01:31:53 +02:00
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*****************************************************************************
|
|
* vlc_gcrypt.h: VLC thread support for gcrypt
|
|
*****************************************************************************
|
|
* Copyright (C) 2004-2008 Rémi Denis-Courmont
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* \file
|
|
* This file implements gcrypt support functions in vlc
|
|
*/
|
|
|
|
#ifdef LIBVLC_USE_PTHREAD
|
|
/**
|
|
* If possible, use gcrypt-provided thread implementation. This is so that
|
|
* other non-VLC components (inside the process) can also use gcrypt safely.
|
|
*/
|
|
GCRY_THREAD_OPTION_PTHREAD_IMPL;
|
|
# define gcry_threads_vlc gcry_threads_pthread
|
|
#else
|
|
|
|
/**
|
|
* gcrypt thread option VLC implementation
|
|
*/
|
|
|
|
static int gcry_vlc_mutex_init( void **p_sys )
|
|
{
|
|
int i_val;
|
|
vlc_mutex_t *p_lock = (vlc_mutex_t *)malloc( sizeof( vlc_mutex_t ) );
|
|
|
|
if( p_lock == NULL)
|
|
return ENOMEM;
|
|
|
|
i_val = vlc_mutex_init( p_lock );
|
|
if( i_val )
|
|
free( p_lock );
|
|
else
|
|
*p_sys = p_lock;
|
|
return i_val;
|
|
}
|
|
|
|
static int gcry_vlc_mutex_destroy( void **p_sys )
|
|
{
|
|
vlc_mutex_t *p_lock = (vlc_mutex_t *)*p_sys;
|
|
vlc_mutex_destroy( p_lock );
|
|
free( p_lock );
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int gcry_vlc_mutex_lock( void **p_sys )
|
|
{
|
|
vlc_mutex_lock( (vlc_mutex_t *)*p_sys );
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int gcry_vlc_mutex_unlock( void **lock )
|
|
{
|
|
vlc_mutex_unlock( (vlc_mutex_t *)*lock );
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static const struct gcry_thread_cbs gcry_threads_vlc =
|
|
{
|
|
GCRY_THREAD_OPTION_USER,
|
|
NULL,
|
|
gcry_vlc_mutex_init,
|
|
gcry_vlc_mutex_destroy,
|
|
gcry_vlc_mutex_lock,
|
|
gcry_vlc_mutex_unlock
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* Initializes gcrypt with proper locking.
|
|
*/
|
|
static inline void vlc_gcrypt_init (void)
|
|
{
|
|
/* This would need a process-wide static mutex with all libraries linking
|
|
* to a given instance of libgcrypt. We cannot do this as we have different
|
|
* plugins linking with gcrypt, and some underlying libraries may use it
|
|
* behind our back. Only way is to always link gcrypt statically (ouch!) or
|
|
* have upstream gcrypt provide one shared object per threading system. */
|
|
static vlc_mutex_t lock = VLC_STATIC_MUTEX;
|
|
static bool done = false;
|
|
|
|
vlc_mutex_lock (&lock);
|
|
if (!done)
|
|
{
|
|
gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_vlc);
|
|
done = true;
|
|
}
|
|
vlc_mutex_unlock (&lock);
|
|
}
|