Don't loop continuously the playlist thread, use cond.
[vlc.git] / src / playlist / thread.c
1 /*****************************************************************************
2  * playlist.c : Playlist management functions
3  *****************************************************************************
4  * Copyright (C) 1999-2004 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Samuel Hocevar <sam@zoy.org>
8  *          ClĂ©ment 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 #include <vlc/vlc.h>
25 #include <vlc_es.h>
26 #include <vlc_input.h>
27 #include "vlc_playlist.h"
28 #include "vlc_interaction.h"
29 #include "playlist_internal.h"
30
31 /*****************************************************************************
32  * Local prototypes
33  *****************************************************************************/
34 static void RunControlThread ( playlist_t * );
35 static void RunPreparse( playlist_preparse_t * );
36 static void RunSecondaryPreparse( playlist_secondary_preparse_t * );
37
38 static playlist_t * CreatePlaylist( vlc_object_t *p_parent );
39 static void HandlePlaylist( playlist_t * );
40 static void EndPlaylist( playlist_t * );
41 static void DestroyPlaylist( playlist_t * );
42
43 static void HandleInteraction( playlist_t * );
44 static void DestroyInteraction( playlist_t * );
45
46 /*****************************************************************************
47  * Main functions for the global thread
48  *****************************************************************************/
49
50 /**
51  * Create the main playlist thread
52  * Additionally to the playlist, this thread controls :
53  *    - Interaction
54  *    - Statistics
55  *    - VLM
56  * \param p_parent
57  * \return an object with a started thread
58  */
59 void __playlist_ThreadCreate( vlc_object_t *p_parent )
60 {
61     playlist_t *p_playlist;
62     p_playlist = CreatePlaylist( p_parent );
63
64     if( !p_playlist ) return;
65
66     // Stats
67     p_playlist->p_stats = (global_stats_t *)malloc( sizeof( global_stats_t ) );
68     vlc_mutex_init( p_playlist, &p_playlist->p_stats->lock );
69     p_playlist->p_stats_computer = NULL;
70
71     // Interaction
72     p_playlist->p_interaction = NULL;
73
74     // Preparse
75     p_playlist->p_preparse = vlc_object_create( p_playlist,
76                                   sizeof( playlist_preparse_t ) );
77     if( !p_playlist->p_preparse )
78     {
79         msg_Err( p_playlist, "unable to create preparser" );
80         vlc_object_destroy( p_playlist );
81         return;
82     }
83     p_playlist->p_preparse->i_waiting = 0;
84     p_playlist->p_preparse->pp_waiting = NULL;
85
86     vlc_object_attach( p_playlist->p_preparse, p_playlist );
87     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
88                            RunPreparse, VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
89     {
90         msg_Err( p_playlist, "cannot spawn preparse thread" );
91         vlc_object_detach( p_playlist->p_preparse );
92         vlc_object_destroy( p_playlist->p_preparse );
93         return;
94     }
95
96     // Secondary Preparse
97     p_playlist->p_secondary_preparse = vlc_object_create( p_playlist,
98                               sizeof( playlist_secondary_preparse_t ) );
99     if( !p_playlist->p_secondary_preparse )
100     {
101         msg_Err( p_playlist, "unable to create secondary preparser" );
102         vlc_object_destroy( p_playlist );
103         return;
104     }
105     p_playlist->p_secondary_preparse->i_waiting = 0;
106     p_playlist->p_secondary_preparse->p_waiting = NULL;
107
108     vlc_object_attach( p_playlist->p_secondary_preparse, p_playlist );
109     if( vlc_thread_create( p_playlist->p_secondary_preparse,
110                            "secondary preparser",
111                            RunSecondaryPreparse,
112                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
113     {
114         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
115         vlc_object_detach( p_playlist->p_secondary_preparse );
116         vlc_object_destroy( p_playlist->p_secondary_preparse );
117         return;
118     }
119
120     // Start the thread
121     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
122                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
123     {
124         msg_Err( p_playlist, "cannot spawn playlist thread" );
125         vlc_object_destroy( p_playlist );
126         return;
127     }
128
129     /* The object has been initialized, now attach it */
130     vlc_object_attach( p_playlist, p_parent );
131
132     return;
133 }
134
135 /**
136  * Destroy the playlist global thread.
137  *
138  * Deinits all things controlled by the playlist global thread
139  * \param p_playlist the playlist thread to destroy
140  * \return VLC_SUCCESS or an error
141  */
142 int playlist_ThreadDestroy( playlist_t * p_playlist )
143 {
144     p_playlist->b_die = VLC_TRUE;
145     playlist_Signal( p_playlist );
146     if( p_playlist->p_preparse )
147     {
148         vlc_cond_signal( &p_playlist->p_preparse->object_wait );
149         free( p_playlist->p_preparse->pp_waiting );
150     }
151     if( p_playlist->p_secondary_preparse )
152     {
153         vlc_cond_signal( &p_playlist->p_secondary_preparse->object_wait );
154         free( p_playlist->p_secondary_preparse->p_waiting );
155     }
156
157     DestroyInteraction( p_playlist );
158     DestroyPlaylist( p_playlist );
159
160     return VLC_SUCCESS;
161 }
162
163 /**
164  * Run the main control thread itself
165  */
166 static void RunControlThread ( playlist_t *p_playlist )
167 {
168    int i_loops = 0;
169
170    /* Tell above that we're ready */
171    vlc_thread_ready( p_playlist );
172
173     while( !p_playlist->b_die )
174     {
175         i_loops++;
176
177         HandleInteraction( p_playlist );
178         HandlePlaylist( p_playlist );
179         if( p_playlist->b_cant_sleep )
180         {
181             /* 100 ms is an acceptable delay for playlist operations */
182             msleep( INTF_IDLE_SLEEP*2 );
183         }
184         else
185         {
186             PL_LOCK;
187             vlc_cond_wait( &p_playlist->object_wait, &p_playlist->object_lock );
188             PL_UNLOCK;
189         }
190     }
191
192     EndPlaylist( p_playlist );
193 }
194
195
196 /*****************************************************************************
197  * Playlist-specific functions
198  *****************************************************************************/
199 static playlist_t * CreatePlaylist( vlc_object_t *p_parent )
200 {
201     return playlist_Create( p_parent );
202 }
203
204 static void DestroyPlaylist( playlist_t *p_playlist )
205 {
206     playlist_Destroy( p_playlist );
207 }
208
209 static void HandlePlaylist( playlist_t *p_playlist )
210 {
211     playlist_MainLoop( p_playlist );
212 }
213
214 static void EndPlaylist( playlist_t *p_playlist )
215 {
216     playlist_LastLoop( p_playlist );
217 }
218
219 /*****************************************************************************
220  * Preparse-specific functions
221  *****************************************************************************/
222 static void RunPreparse ( playlist_preparse_t *p_obj )
223 {
224     /* Tell above that we're ready */
225     vlc_thread_ready( p_obj );
226     playlist_PreparseLoop( p_obj );
227 }
228
229 static void RunSecondaryPreparse( playlist_secondary_preparse_t *p_obj )
230 {
231     /* Tell above that we're ready */
232     vlc_thread_ready( p_obj );
233     playlist_SecondaryPreparseLoop( p_obj );
234 }
235
236 /*****************************************************************************
237  * Interaction functions
238  *****************************************************************************/
239 static void DestroyInteraction( playlist_t *p_playlist )
240 {
241     if( p_playlist->p_interaction )
242     {
243         intf_InteractionDestroy( p_playlist->p_interaction );
244         fprintf( stderr, "NOW NULL ****\n" );
245         p_playlist->p_interaction = NULL;
246     }
247 }
248
249 static void HandleInteraction( playlist_t *p_playlist )
250 {
251     if( p_playlist->p_interaction )
252     {
253         stats_TimerStart( p_playlist, "Interaction thread",
254                           STATS_TIMER_INTERACTION );
255         intf_InteractionManage( p_playlist );
256         stats_TimerStop( p_playlist, STATS_TIMER_INTERACTION );
257     }
258 }