src/misc/threads.c

   1 /*****************************************************************************
   2  * threads.c : threads implementation for the VideoLAN client
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *          Clément Sténac
  11  *          Rémi Denis-Courmont
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33
  34 #include "libvlc.h"
  35 #include <assert.h>
  36 #include <errno.h>
  37 #ifdef HAVE_UNISTD_H
  38 # include <unistd.h>
  39 #endif
  40
  41 #if defined( LIBVLC_USE_PTHREAD )
  42 # include <sched.h>
  43 #endif
  44
  45 struct vlc_thread_boot
  46 {
  47     void * (*entry) (vlc_object_t *);
  48     vlc_object_t *object;
  49 };
  50
  51 static void *thread_entry (void *data)
  52 {
  53     vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
  54     void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
  55
  56     free (data);
  57     msg_Dbg (obj, "thread started");
  58     func (obj);
  59     msg_Dbg (obj, "thread ended");
  60
  61     return NULL;
  62 }
  63
  64 #undef vlc_thread_create
  65 /*****************************************************************************
  66  * vlc_thread_create: create a thread
  67  *****************************************************************************
  68  * Note that i_priority is only taken into account on platforms supporting
  69  * userland real-time priority threads.
  70  *****************************************************************************/
  71 int vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
  72                        const char *psz_name, void *(*func) ( vlc_object_t * ),
  73                        int i_priority )
  74 {
  75     int i_ret;
  76     vlc_object_internals_t *p_priv = vlc_internals( p_this );
  77
  78     struct vlc_thread_boot *boot = malloc (sizeof (*boot));
  79     if (boot == NULL)
  80         return errno;
  81     boot->entry = func;
  82     boot->object = p_this;
  83
  84     /* Make sure we don't re-create a thread if the object has already one */
  85     assert( !p_priv->b_thread );
  86
  87     p_priv->b_thread = true;
  88     i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
  89     if( i_ret == 0 )
  90         msg_Dbg( p_this, "thread (%s) created at priority %d (%s:%d)",
  91                  psz_name, i_priority, psz_file, i_line );
  92     else
  93     {
  94         p_priv->b_thread = false;
  95         errno = i_ret;
  96         msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
  97                          psz_name, psz_file, i_line );
  98     }
  99
 100     return i_ret;
 101 }
 102
 103 /*****************************************************************************
 104  * vlc_thread_set_priority: set the priority of the current thread when we
 105  * couldn't set it in vlc_thread_create (for instance for the main thread)
 106  *****************************************************************************/
 107 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
 108                                int i_line, int i_priority )
 109 {
 110     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 111
 112     if( !p_priv->b_thread )
 113     {
 114         msg_Err( p_this, "couldn't set priority of non-existent thread" );
 115         return ESRCH;
 116     }
 117
 118 #if defined( LIBVLC_USE_PTHREAD )
 119 # ifndef __APPLE__
 120     if( config_GetInt( p_this, "rt-priority" ) > 0 )
 121 # endif
 122     {
 123         int i_error, i_policy;
 124         struct sched_param param;
 125
 126         memset( &param, 0, sizeof(struct sched_param) );
 127         if( config_GetType( p_this, "rt-offset" ) )
 128             i_priority += config_GetInt( p_this, "rt-offset" );
 129         if( i_priority <= 0 )
 130         {
 131             param.sched_priority = (-1) * i_priority;
 132             i_policy = SCHED_OTHER;
 133         }
 134         else
 135         {
 136             param.sched_priority = i_priority;
 137             i_policy = SCHED_RR;
 138         }
 139         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 140                                               i_policy, &param )) )
 141         {
 142             errno = i_error;
 143             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
 144                       psz_file, i_line );
 145             i_priority = 0;
 146         }
 147     }
 148
 149 #elif defined( WIN32 ) || defined( UNDER_CE )
 150     VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
 151
 152 #ifndef UNDER_CE
 153     if( !SetThreadPriority(p_priv->thread_id, i_priority) )
 154 #else
 155     if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
 156 #endif
 157     {
 158         msg_Warn( p_this, "couldn't set a faster priority" );
 159         return 1;
 160     }
 161
 162 #endif
 163
 164     return 0;
 165 }
 166
 167 /*****************************************************************************
 168  * vlc_thread_join: wait until a thread exits, inner version
 169  *****************************************************************************/
 170 void __vlc_thread_join( vlc_object_t *p_this )
 171 {
 172     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 173
 174 #if defined( WIN32 ) && !defined( UNDER_CE )
 175     HANDLE hThread;
 176     FILETIME create_ft, exit_ft, kernel_ft, user_ft;
 177     int64_t real_time, kernel_time, user_time;
 178
 179     if( ! DuplicateHandle(GetCurrentProcess(),
 180             p_priv->thread_id,
 181             GetCurrentProcess(),
 182             &hThread,
 183             0,
 184             FALSE,
 185             DUPLICATE_SAME_ACCESS) )
 186     {
 187         p_priv->b_thread = false;
 188         return; /* We have a problem! */
 189     }
 190 #endif
 191
 192     vlc_join( p_priv->thread_id, NULL );
 193
 194 #if defined( WIN32 ) && !defined( UNDER_CE )
 195     /* FIXME: this could work on WinCE too... except that it seems always to
 196      * return 0 for exit_ft and kernel_ft */
 197     if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
 198     {
 199         real_time =
 200           ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
 201           ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
 202         real_time /= 10;
 203
 204         kernel_time =
 205           ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
 206            kernel_ft.dwLowDateTime) / 10;
 207
 208         user_time =
 209           ((((int64_t)user_ft.dwHighDateTime)<<32)|
 210            user_ft.dwLowDateTime) / 10;
 211
 212         msg_Dbg( p_this, "thread times: "
 213                  "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
 214                  real_time/60/1000000,
 215                  (double)((real_time%(60*1000000))/1000000.0),
 216                  kernel_time/60/1000000,
 217                  (double)((kernel_time%(60*1000000))/1000000.0),
 218                  user_time/60/1000000,
 219                  (double)((user_time%(60*1000000))/1000000.0) );
 220     }
 221     CloseHandle( hThread );
 222 #endif
 223
 224     p_priv->b_thread = false;
 225 }
 226
 227 void vlc_thread_cancel (vlc_object_t *obj)
 228 {
 229     vlc_object_internals_t *priv = vlc_internals (obj);
 230
 231     if (priv->b_thread)
 232         vlc_cancel (priv->thread_id);
 233 }