vlc_gcrypt.h
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:3k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * 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);
- }