X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Fvlc_mtime.h;h=f3bb895d42fdbde9294c2c60d378f5889ddaf684;hb=1fcd8954bc872b9d6b338b3d4aa4e0281bf7b94d;hp=c2ad1bea802d8d244e6f34854f2765417d095b9f;hpb=218bc1f9815d90acfd1dc3ac5f2aafd7ac217838;p=vlc

diff --git a/include/vlc_mtime.h b/include/vlc_mtime.h
index c2ad1bea80..f3bb895d42 100644
--- a/include/vlc_mtime.h
+++ b/include/vlc_mtime.h
@@ -68,19 +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 ) );
 
-#ifdef __GNUC__
+#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__((warning("use proper event handling instead")))
-void bad_msleep( mtime_t delay )
+__attribute__((error("deadlines can not be constant")))
+mtime_t impossible_deadline( mtime_t deadline )
 {
-    msleep( delay );
+    return deadline;
 }
-# define msleep( d ) \
-   ((__builtin_constant_p(d) && (d < 29000000)) ? bad_msleep(d) : msleep(d))
+
+# 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
  *****************************************************************************/