Commit b22e2a9f authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

Detect unsupported sleep delay at compile time

(Currently, <1ms on Linux, and <0 on others)
parent 116ca8af
......@@ -69,6 +69,23 @@ VLC_EXPORT( void, msleep, ( mtime_t delay ) );
VLC_EXPORT( char *, secstotimestr, ( char *psz_buffer, int secs ) );
#ifdef __GNUC__
# ifdef __linux__
# define VLC_HARD_MIN_SLEEP 1000 /* Linux has 100, 250, 300 or 1000Hz */
# else
# define VLC_HARD_MIN_SLEEP 0
# endif
#define VLC_SOFT_MIN_SLEEP 29000000
static
__attribute__((unused))
__attribute__((noinline))
__attribute__((error("sorry, cannot sleep for such short a time")))
void impossible_msleep( mtime_t delay )
{
(void) delay;
msleep( VLC_HARD_MIN_SLEEP );
}
static
__attribute__((unused))
__attribute__((noinline))
......@@ -77,8 +94,13 @@ void bad_msleep( mtime_t delay )
{
msleep( delay );
}
# define msleep( d ) \
((__builtin_constant_p(d) && (d < 29000000)) ? bad_msleep(d) : msleep(d))
(__builtin_constant_p(d < VLC_HARD_MIN_SLEEP) \
? impossible_msleep(d) \
: (__builtin_constant_p(d < VLC_SOFT_MIN_SLEEP) \
? bad_msleep(d) \
: msleep(d)))
#endif
/*****************************************************************************
......
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