* src/misc/threads.c: made vlc_set_thread_priority usable on non-Darwin

  OSes, and added an rt-offset configuration variable to tune the priority
  of VLC against other programs without recompiling everything.

src/libvlc.h

@@ -2,7 +2,7 @@
  * libvlc.h: main libvlc header
  *****************************************************************************
  * Copyright (C) 1998-2002 VideoLAN
- * $Id: libvlc.h,v 1.133 2004/02/11 19:17:13 fenrir Exp $
+ * $Id: libvlc.h,v 1.134 2004/02/20 17:20:01 massiot Exp $
  *
  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  *          Samuel Hocevar <sam@zoy.org>
@@ -523,6 +523,12 @@ static char *ppsz_align_descriptions[] = { N_("Center"),
     "slow. You should only activate this if you know what you're " \
     "doing.")
 
+#define RT_OFFSET_TEXT N_("Adjust VLC priority")
+#define RT_OFFSET_LONGTEXT N_( \
+    "This options adds an offset (positive or negative) to VLC default " \
+    "priorities. You can use it to tune VLC priority against other " \
+    "programs, or against other VLC instances.")
+
 #define MINIMIZE_THREADS_TXT N_("Minimize number of threads")
 #define MINIMIZE_THREADS_LONGTXT N_( \
      "This option minimizes the number of threads needed to run VLC")
@@ -850,6 +856,10 @@ vlc_module_begin();
     add_bool( "rt-priority", 0, NULL, RT_PRIORITY_TEXT, RT_PRIORITY_LONGTEXT, VLC_TRUE );
 #endif
 
+#if !defined(SYS_BEOS) && defined(PTHREAD_COND_T_IN_PTHREAD_H)
+    add_integer( "rt-offset", 0, NULL, RT_OFFSET_TEXT, RT_OFFSET_LONGTEXT, VLC_TRUE );
+#endif
+
 #if defined(WIN32)
     add_bool( "one-instance", 0, NULL, ONEINSTANCE_TEXT, ONEINSTANCE_LONGTEXT, VLC_TRUE );
     add_bool( "high-priority", 1, NULL, HPRIORITY_TEXT, HPRIORITY_LONGTEXT, VLC_TRUE );

src/misc/threads.c

@@ -2,7 +2,7 @@
  * threads.c : threads implementation for the VideoLAN client
  *****************************************************************************
  * Copyright (C) 1999-2004 VideoLAN
- * $Id: threads.c,v 1.45 2004/01/06 12:02:06 zorglub Exp $
+ * $Id: threads.c,v 1.46 2004/02/20 17:20:01 massiot Exp $
  *
  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
  *          Samuel Hocevar <sam@zoy.org>
@@ -568,7 +568,9 @@ int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
     {
         int i_error, i_policy;
         struct sched_param param;
+
         memset( &param, 0, sizeof(struct sched_param) );
+        i_priority += config_GetInt( p_this, "rt-offset" );
         if ( i_priority < 0 )
         {
             param.sched_priority = (-1) * i_priority;
@@ -645,13 +647,17 @@ int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
     }
 
 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
-
-#ifdef SYS_DARWIN
-    if ( i_priority )
+    if ( i_priority
+#ifndef SYS_DARWIN
+            && config_GetInt( p_this, "rt-priority" )
+#endif
+        )
     {
         int i_error, i_policy;
         struct sched_param param;
+
         memset( &param, 0, sizeof(struct sched_param) );
+        i_priority += config_GetInt( p_this, "rt-offset" );
         if ( i_priority < 0 )
         {
             param.sched_priority = (-1) * i_priority;
@@ -662,7 +668,7 @@ int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
             param.sched_priority = i_priority;
             i_policy = SCHED_RR;
         }
-        if ( (i_error = pthread_setschedparam( pthread_self(),
+        if ( (i_error = pthread_setschedparam( p_this->thread_id,
                                                i_policy, &param )) )
         {
             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
@@ -670,8 +676,6 @@ int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
             i_priority = 0;
         }
     }
-#endif
-
 #endif
 
     return 0;