X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Fvlc_mtime.h;h=f3bb895d42fdbde9294c2c60d378f5889ddaf684;hb=584fb9f5d0a4342a4651f935f2dd96870caa09ad;hp=458cf35d35ada05935dd81441f937af8fd91adbc;hpb=d3fe7f28797d4dba65ffcdd60bf932e758a48a9e;p=vlc

diff --git a/include/vlc_mtime.h b/include/vlc_mtime.h
index 458cf35d35..f3bb895d42 100644
--- a/include/vlc_mtime.h
+++ b/include/vlc_mtime.h
@@ -1,5 +1,6 @@
 /*****************************************************************************
- * mtime.h: high resolution time management functions
+ * vlc_mtime.h: high resolution time management functions
+ *****************************************************************************
  * This header provides portable high precision time management functions,
  * which should be the only ones used in other segments of the program, since
  * functions like gettimeofday() and ftime() are not always supported.
@@ -28,6 +29,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
+#ifndef __VLC_MTIME_H
+# define __VLC_MTIME_H 1
+
 /*****************************************************************************
  * LAST_MDATE: date which will never happen
  *****************************************************************************
@@ -64,6 +68,57 @@ VLC_EXPORT( void,    mwait,    ( mtime_t date ) );
 VLC_EXPORT( void,    msleep,   ( mtime_t delay ) );
 VLC_EXPORT( char *,  secstotimestr, ( char *psz_buffer, int secs ) );
 
+#if defined (__GNUC__) && defined (__linux__)
+# define VLC_HARD_MIN_SLEEP 1000 /* Linux has 100, 250, 300 or 1000Hz */
+# define VLC_SOFT_MIN_SLEEP 9000000
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((error("sorry, cannot sleep for such short a time")))
+mtime_t impossible_delay( mtime_t delay )
+{
+    (void) delay;
+    return VLC_HARD_MIN_SLEEP;
+}
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((warning("use proper event handling instead of short delay")))
+mtime_t harmful_delay( mtime_t delay )
+{
+    return delay;
+}
+
+# define check_delay( d ) \
+    ((__builtin_constant_p(d < VLC_HARD_MIN_SLEEP) \
+   && (d < VLC_HARD_MIN_SLEEP)) \
+       ? impossible_delay(d) \
+       : ((__builtin_constant_p(d < VLC_SOFT_MIN_SLEEP) \
+       && (d < VLC_SOFT_MIN_SLEEP)) \
+           ? harmful_delay(d) \
+           : d))
+
+static
+__attribute__((unused))
+__attribute__((noinline))
+__attribute__((error("deadlines can not be constant")))
+mtime_t impossible_deadline( mtime_t deadline )
+{
+    return deadline;
+}
+
+# define check_deadline( d ) \
+    (__builtin_constant_p(d) ? impossible_deadline(d) : d)
+#else
+# define check_delay(d) (d)
+# define check_deadline(d) (d)
+#endif
+
+#define msleep(d) msleep(check_delay(d))
+#define mwait(d) mwait(check_deadline(d))
+
 /*****************************************************************************
  * date_t: date incrementation without long-term rounding errors
  *****************************************************************************/
@@ -81,3 +136,5 @@ VLC_EXPORT( void,    date_Set,       ( date_t *, mtime_t ) );
 VLC_EXPORT( mtime_t, date_Get,       ( const date_t * ) );
 VLC_EXPORT( void,    date_Move,      ( date_t *, mtime_t ) );
 VLC_EXPORT( mtime_t, date_Increment, ( date_t *, uint32_t ) );
+VLC_EXPORT( uint64_t, NTPtime64,     ( void ) );
+#endif /* !__VLC_MTIME_ */