New vlc_thread_set_priority function, to set the priority of the main

thread.

include/vlc_threads_funcs.h

@@ -3,7 +3,7 @@
  * This header provides a portable threads implementation.
  *****************************************************************************
  * Copyright (C) 1999, 2002 VideoLAN
- * $Id: vlc_threads_funcs.h,v 1.9 2002/11/11 14:39:11 sam Exp $
+ * $Id: vlc_threads_funcs.h,v 1.10 2002/12/08 00:41:06 massiot Exp $
  *
  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
  *          Samuel Hocevar <sam@via.ecp.fr>
@@ -35,9 +35,11 @@ VLC_EXPORT( int,  __vlc_mutex_destroy, ( char *, int, vlc_mutex_t * ) );
 VLC_EXPORT( int,  __vlc_cond_init,     ( vlc_object_t *, vlc_cond_t * ) );
 VLC_EXPORT( int,  __vlc_cond_destroy,  ( char *, int, vlc_cond_t * ) );
 VLC_EXPORT( int,  __vlc_thread_create, ( vlc_object_t *, char *, int, char *, void * ( * ) ( void * ), int, vlc_bool_t ) );
+VLC_EXPORT( int,  __vlc_thread_set_priority, ( vlc_object_t *, char *, int, int ) );
 VLC_EXPORT( void, __vlc_thread_ready,  ( vlc_object_t * ) );
 VLC_EXPORT( void, __vlc_thread_join,   ( vlc_object_t *, char *, int ) );
 
+
 /*****************************************************************************
  * vlc_threads_init: initialize threads system
  *****************************************************************************/
@@ -684,6 +686,12 @@ static inline int __vlc_cond_wait( char * psz_file, int i_line,
 #define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, PRIORITY, WAIT )         \
     __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, PRIORITY, WAIT )
 
+/*****************************************************************************
+ * vlc_thread_set_priority: set the priority of the calling thread
+ *****************************************************************************/
+#define vlc_thread_set_priority( P_THIS, PRIORITY )                         \
+    __vlc_thread_set_priority( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PRIORITY )
+
 /*****************************************************************************
  * vlc_thread_ready: tell the parent thread we were successfully spawned
  *****************************************************************************/

src/libvlc.c

@@ -2,7 +2,7 @@
  * libvlc.c: main libvlc source
  *****************************************************************************
  * Copyright (C) 1998-2002 VideoLAN
- * $Id: libvlc.c,v 1.49 2002/12/03 16:29:04 gitan Exp $
+ * $Id: libvlc.c,v 1.50 2002/12/08 00:41:06 massiot Exp $
  *
  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  *          Samuel Hocevar <sam@zoy.org>
@@ -763,7 +763,8 @@ int VLC_Play( int i_object )
         VLC_AddIntf( 0, "sap", VLC_FALSE );
     }
 
-    
+    vlc_thread_set_priority( p_vlc, VLC_THREAD_PRIORITY_LOW );
+
     p_playlist = vlc_object_find( p_vlc, VLC_OBJECT_PLAYLIST, FIND_CHILD );
 
     if( !p_playlist )

src/misc/threads.c

@@ -2,7 +2,7 @@
  * threads.c : threads implementation for the VideoLAN client
  *****************************************************************************
  * Copyright (C) 1999, 2000, 2001, 2002 VideoLAN
- * $Id: threads.c,v 1.27 2002/12/06 10:10:40 sam Exp $
+ * $Id: threads.c,v 1.28 2002/12/08 00:41:06 massiot Exp $
  *
  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
  *          Samuel Hocevar <sam@zoy.org>
@@ -612,7 +612,8 @@ int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
         param.sched_priority = i_priority;
         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
         {
-            msg_Warn( p_this, "couldn't go to real-time priority" );
+            msg_Warn( p_this, "couldn't go to real-time priority (%s:%d)",
+                      psz_file, i_line );
             i_priority = 0;
         }
     }
@@ -670,6 +671,32 @@ int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
     return i_ret;
 }
 
+/*****************************************************************************
+ * vlc_thread_set_priority: set the priority of the current thread when we
+ * couldn't set it in vlc_thread_create (for instance for the main thread)
+ *****************************************************************************/
+int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
+                               int i_line, int i_priority )
+{
+#if defined( WIN32 ) || defined( UNDER_CE )
+    /* FIXME: implement it under Win32 ! */
+
+#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
+    if ( i_priority )
+    {
+        struct sched_param param;
+        memset( &param, 0, sizeof(struct sched_param) );
+        param.sched_priority = i_priority;
+        if ( pthread_setschedparam( pthread_self(), SCHED_RR, &param ) )
+        {
+            msg_Warn( p_this, "couldn't go to real-time priority (%s:%d)",
+                      psz_file, i_line );
+            i_priority = 0;
+        }
+    }
+#endif
+}
+
 /*****************************************************************************
  * vlc_thread_ready: tell the parent thread we were successfully spawned
  *****************************************************************************/