git.sesse.net Git - vlc/blob - src/playlist/thread.c

   1 /*****************************************************************************
   2  * thread.c : Playlist management functions
   3  *****************************************************************************
   4  * Copyright © 1999-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Clément Stenac <zorglub@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_common.h>
  29 #include <vlc_es.h>
  30 #include <vlc_input.h>
  31 #include <vlc_interface.h>
  32 #include <vlc_playlist.h>
  33 #include "playlist_internal.h"
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static void* RunControlThread   ( vlc_object_t * );
  39
  40 /*****************************************************************************
  41  * Main functions for the global thread
  42  *****************************************************************************/
  43
  44 /**
  45  * Create the main playlist thread
  46  * Additionally to the playlist, this thread controls :
  47  *    - Statistics
  48  *    - VLM
  49  * \param p_parent
  50  * \return an object with a started thread
  51  */
  52 void __playlist_ThreadCreate( vlc_object_t *p_parent )
  53 {
  54     playlist_t *p_playlist = playlist_Create( p_parent );
  55     if( !p_playlist ) return;
  56
  57     // Preparse
  58     playlist_preparse_t *p_preparse = &pl_priv(p_playlist)->preparse;
  59     vlc_mutex_init (&p_preparse->lock);
  60     vlc_cond_init (&p_preparse->wait);
  61     p_preparse->i_waiting = 0;
  62     p_preparse->pp_waiting = NULL;
  63
  64     if( vlc_clone( &p_preparse->thread, playlist_PreparseLoop, p_preparse,
  65                    VLC_THREAD_PRIORITY_LOW ) )
  66     {
  67         msg_Err( p_playlist, "cannot spawn preparse thread" );
  68         p_preparse->up = false;
  69         return;
  70     }
  71     p_preparse->up = true;
  72
  73     // Secondary Preparse
  74     playlist_fetcher_t *p_fetcher = &pl_priv(p_playlist)->fetcher;
  75     vlc_mutex_init (&p_fetcher->lock);
  76     vlc_cond_init (&p_fetcher->wait);
  77     p_fetcher->i_waiting = 0;
  78     p_fetcher->pp_waiting = NULL;
  79     p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist, "album-art" );
  80
  81     if( vlc_clone( &p_fetcher->thread, playlist_FetcherLoop, p_fetcher,
  82                    VLC_THREAD_PRIORITY_LOW ) )
  83     {
  84         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
  85         p_fetcher->up = false;
  86         return;
  87     }
  88     p_fetcher->up = true;
  89
  90     // Start the thread
  91     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
  92                            VLC_THREAD_PRIORITY_LOW, false ) )
  93     {
  94         msg_Err( p_playlist, "cannot spawn playlist thread" );
  95         vlc_object_release( p_playlist );
  96         return;
  97     }
  98
  99     /* The object has been initialized, now attach it */
 100     vlc_object_attach( p_playlist, p_parent );
 101
 102     return;
 103 }
 104
 105 /**
 106  * Run the main control thread itself
 107  */
 108 static void* RunControlThread ( vlc_object_t *p_this )
 109 {
 110     playlist_t *p_playlist = (playlist_t*)p_this;
 111
 112     int canc = vlc_savecancel ();
 113     vlc_object_lock( p_playlist );
 114     while( vlc_object_alive( p_playlist ) )
 115     {
 116         playlist_MainLoop( p_playlist );
 117
 118         /* The playlist lock has been unlocked, so we can't tell if
 119          * someone has killed us in the meantime. Check now. */
 120         if( !vlc_object_alive( p_playlist ) )
 121             break;
 122
 123         if( p_playlist->b_cant_sleep )
 124         {
 125             /* 100 ms is an acceptable delay for playlist operations */
 126             vlc_object_unlock( p_playlist );
 127
 128             msleep( INTF_IDLE_SLEEP*2 );
 129
 130             vlc_object_lock( p_playlist );
 131         }
 132         else
 133         {
 134             vlc_object_wait( p_playlist );
 135         }
 136     }
 137     vlc_object_unlock( p_playlist );
 138
 139     playlist_LastLoop( p_playlist );
 140     vlc_restorecancel (canc);
 141     return NULL;
 142 }