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 static void* RunFetcher         ( vlc_object_t * );
  40 static void FetcherDestructor   ( vlc_object_t * );
  41
  42 /*****************************************************************************
  43  * Main functions for the global thread
  44  *****************************************************************************/
  45
  46 /**
  47  * Create the main playlist thread
  48  * Additionally to the playlist, this thread controls :
  49  *    - Statistics
  50  *    - VLM
  51  * \param p_parent
  52  * \return an object with a started thread
  53  */
  54 void __playlist_ThreadCreate( vlc_object_t *p_parent )
  55 {
  56     playlist_t *p_playlist = playlist_Create( p_parent );
  57     if( !p_playlist ) return;
  58
  59     // Preparse
  60     playlist_preparse_t *p_preparse = &pl_priv(p_playlist)->preparse;
  61     vlc_mutex_init (&p_preparse->lock);
  62     vlc_cond_init (&p_preparse->wait);
  63     p_preparse->i_waiting = 0;
  64     p_preparse->pp_waiting = NULL;
  65
  66     if( vlc_clone( &p_preparse->thread, playlist_PreparseLoop, p_preparse,
  67                    VLC_THREAD_PRIORITY_LOW ) )
  68     {
  69         msg_Err( p_playlist, "cannot spawn preparse thread" );
  70         p_preparse->up = false;
  71         return;
  72     }
  73     p_preparse->up = true;
  74
  75     // Secondary Preparse
  76     static const char fname[] = "fetcher";
  77     playlist_fetcher_t *p_fetcher =
  78     pl_priv(p_playlist)->p_fetcher =
  79         vlc_custom_create( p_playlist, sizeof( playlist_fetcher_t ),
  80                            VLC_OBJECT_GENERIC, fname );
  81     if( !p_fetcher )
  82     {
  83         msg_Err( p_playlist, "unable to create secondary preparser" );
  84         vlc_object_release( p_playlist );
  85         return;
  86     }
  87     p_fetcher->i_waiting = 0;
  88     p_fetcher->pp_waiting = NULL;
  89     p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist, "album-art" );
  90
  91     vlc_object_set_destructor( p_fetcher, FetcherDestructor );
  92     vlc_object_attach( p_fetcher, p_playlist );
  93     if( vlc_thread_create( p_fetcher, "fetcher", RunFetcher,
  94                            VLC_THREAD_PRIORITY_LOW, false ) )
  95     {
  96         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
  97         vlc_object_release( p_fetcher );
  98         return;
  99     }
 100
 101     // Start the thread
 102     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 103                            VLC_THREAD_PRIORITY_LOW, false ) )
 104     {
 105         msg_Err( p_playlist, "cannot spawn playlist thread" );
 106         vlc_object_release( p_playlist );
 107         return;
 108     }
 109
 110     /* The object has been initialized, now attach it */
 111     vlc_object_attach( p_playlist, p_parent );
 112
 113     return;
 114 }
 115
 116 /**
 117  * Run the main control thread itself
 118  */
 119 static void* RunControlThread ( vlc_object_t *p_this )
 120 {
 121     playlist_t *p_playlist = (playlist_t*)p_this;
 122
 123     int canc = vlc_savecancel ();
 124     vlc_object_lock( p_playlist );
 125     while( vlc_object_alive( p_playlist ) )
 126     {
 127         playlist_MainLoop( p_playlist );
 128
 129         /* The playlist lock has been unlocked, so we can't tell if
 130          * someone has killed us in the meantime. Check now. */
 131         if( !vlc_object_alive( p_playlist ) )
 132             break;
 133
 134         if( p_playlist->b_cant_sleep )
 135         {
 136             /* 100 ms is an acceptable delay for playlist operations */
 137             vlc_object_unlock( p_playlist );
 138
 139             msleep( INTF_IDLE_SLEEP*2 );
 140
 141             vlc_object_lock( p_playlist );
 142         }
 143         else
 144         {
 145             vlc_object_wait( p_playlist );
 146         }
 147     }
 148     vlc_object_unlock( p_playlist );
 149
 150     playlist_LastLoop( p_playlist );
 151     vlc_restorecancel (canc);
 152     return NULL;
 153 }
 154
 155 static void* RunFetcher( vlc_object_t *p_this )
 156 {
 157     playlist_fetcher_t *p_obj = (playlist_fetcher_t *)p_this;
 158     int canc = vlc_savecancel ();
 159     playlist_FetcherLoop( p_obj );
 160     vlc_restorecancel (canc);
 161     return NULL;
 162 }
 163
 164 static void FetcherDestructor( vlc_object_t * p_this )
 165 {
 166     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 167     free( p_fetcher->pp_waiting );
 168     msg_Dbg( p_this, "Destroyed" );
 169 }