* mtime.c: high resolution time management functions
* Functions are prototyped in vlc_mtime.h.
*****************************************************************************
- * Copyright (C) 1998-2004 the VideoLAN team
+ * Copyright (C) 1998-2007 the VideoLAN team
* Copyright © 2006-2007 Rémi Denis-Courmont
* $Id$
*
* Authors: Vincent Seguin <seguin@via.ecp.fr>
* Rémi Denis-Courmont <rem$videolan,org>
+ * Gisle Vanem
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* Preamble
*****************************************************************************/
-#include <vlc/vlc.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
-#include <stdio.h> /* sprintf() */
#include <time.h> /* clock_gettime(), clock_nanosleep() */
-#include <stdlib.h> /* lldiv() */
#include <assert.h>
-
-
-#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */
-# include <pth.h>
-#endif
+#include <errno.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h> /* select() */
#if defined( WIN32 ) || defined( UNDER_CE )
# include <windows.h>
-#else
+# include <mmsystem.h>
+#endif
+
+#if defined(HAVE_SYS_TIME_H)
# include <sys/time.h>
#endif
-#if defined(HAVE_NANOSLEEP) && !defined(HAVE_STRUCT_TIMESPEC)
+#if defined(__APPLE__) && !defined(__powerpc__) && !defined(__ppc__) && !defined(__ppc64__)
+#define USE_APPLE_MACH 1
+# include <mach/mach.h>
+# include <mach/mach_time.h>
+#endif
+
+#if !defined(HAVE_STRUCT_TIMESPEC)
struct timespec
{
time_t tv_sec;
int nanosleep(struct timespec *, struct timespec *);
#endif
+#if !defined (_POSIX_CLOCK_SELECTION)
+# define _POSIX_CLOCK_SELECTION (-1)
+#endif
+
+# if (_POSIX_CLOCK_SELECTION < 0)
+/*
+ * We cannot use the monotonic clock if clock selection is not available,
+ * as it would screw vlc_cond_timedwait() completely. Instead, we have to
+ * stick to the realtime clock. Nevermind it screws everything up when ntpdate
+ * warps the wall clock.
+ */
+# undef CLOCK_MONOTONIC
+# define CLOCK_MONOTONIC CLOCK_REALTIME
+#elif !defined (HAVE_CLOCK_NANOSLEEP)
+/* Clock selection without clock in the first place, I don't think so. */
+# error We have quite a situation here! Fix me if it ever happens.
+#endif
+
/**
* Return a date in a readable format
*
*/
char *mstrtime( char *psz_buffer, mtime_t date )
{
- static mtime_t ll1000 = 1000, ll60 = 60, ll24 = 24;
+ static const mtime_t ll1000 = 1000, ll60 = 60, ll24 = 24;
snprintf( psz_buffer, MSTRTIME_MAX_SIZE, "%02d:%02d:%02d-%03d.%03d",
(int) (date / (ll1000 * ll1000 * ll60 * ll60) % ll24),
* \param psz_buffer should be a buffer at least MSTRTIME_MAX_SIZE characters
* \return psz_buffer is returned so this can be used as printf parameter.
*/
-char *secstotimestr( char *psz_buffer, int i_seconds )
+char *secstotimestr( char *psz_buffer, int32_t i_seconds )
{
- snprintf( psz_buffer, MSTRTIME_MAX_SIZE, "%d:%2.2d:%2.2d",
- (int) (i_seconds / (60 *60)),
- (int) ((i_seconds / 60) % 60),
- (int) (i_seconds % 60) );
- return( psz_buffer );
+ if( unlikely(i_seconds < 0) )
+ {
+ secstotimestr( psz_buffer + 1, -i_seconds );
+ *psz_buffer = '-';
+ return psz_buffer;
+ }
+
+ div_t d;
+
+ d = div( i_seconds, 60 );
+ i_seconds = d.rem;
+ d = div( d.quot, 60 );
+
+ if( d.quot )
+ snprintf( psz_buffer, MSTRTIME_MAX_SIZE, "%u:%02u:%02u",
+ d.quot, d.rem, i_seconds );
+ else
+ snprintf( psz_buffer, MSTRTIME_MAX_SIZE, "%02u:%02u",
+ d.rem, i_seconds );
+ return psz_buffer;
+}
+
+#if defined (HAVE_CLOCK_NANOSLEEP)
+static unsigned prec = 0;
+
+static void mprec_once( void )
+{
+ struct timespec ts;
+ if( clock_getres( CLOCK_MONOTONIC, &ts ))
+ clock_getres( CLOCK_REALTIME, &ts );
+
+ prec = ts.tv_nsec / 1000;
}
+#endif
+/**
+ * Return a value that is no bigger than the clock precision
+ * (possibly zero).
+ */
+static inline unsigned mprec( void )
+{
+#if defined (HAVE_CLOCK_NANOSLEEP)
+ static pthread_once_t once = PTHREAD_ONCE_INIT;
+ pthread_once( &once, mprec_once );
+ return prec;
+#else
+ return 0;
+#endif
+}
+
+#ifdef USE_APPLE_MACH
+static mach_timebase_info_data_t mtime_timebase_info;
+static pthread_once_t mtime_timebase_info_once = PTHREAD_ONCE_INIT;
+static void mtime_init_timebase(void)
+{
+ mach_timebase_info(&mtime_timebase_info);
+}
+#endif
/**
* Return high precision date
*
- * Uses the gettimeofday() function when possible (1 MHz resolution) or the
- * ftime() function (1 kHz resolution).
+ * Use a 1 MHz clock when possible, or 1 kHz
+ *
+ * Beware ! It doesn't reflect the actual date (since epoch), but can be the machine's uptime or anything (when monotonic clock is used)
*/
mtime_t mdate( void )
{
+ mtime_t res;
+
#if defined (HAVE_CLOCK_NANOSLEEP)
struct timespec ts;
-# if (_POSIX_MONOTONIC_CLOCK - 0 >= 0)
/* Try to use POSIX monotonic clock if available */
- if( clock_gettime( CLOCK_MONOTONIC, &ts ) )
-# endif
+ if( clock_gettime( CLOCK_MONOTONIC, &ts ) == EINVAL )
/* Run-time fallback to real-time clock (always available) */
(void)clock_gettime( CLOCK_REALTIME, &ts );
- return ((mtime_t)ts.tv_sec * (mtime_t)1000000)
+ res = ((mtime_t)ts.tv_sec * (mtime_t)1000000)
+ (mtime_t)(ts.tv_nsec / 1000);
#elif defined( HAVE_KERNEL_OS_H )
- return( real_time_clock_usecs() );
+ res = real_time_clock_usecs();
+
+#elif defined( USE_APPLE_MACH )
+ pthread_once(&mtime_timebase_info_once, mtime_init_timebase);
+ uint64_t date = mach_absolute_time();
+ mach_timebase_info_data_t tb = mtime_timebase_info;
+
+ /* Get the ssystem dependent factor. Switch to double to prevent overflow */
+ double factor = (double) tb.numer / (double) tb.denom;
+ /* Convert to microseconds */
+ double d = (double) date * factor / 1000;
+ res = d;
#elif defined( WIN32 ) || defined( UNDER_CE )
/* We don't need the real date, just the value of a high precision timer */
- static mtime_t freq = I64C(-1);
+ LARGE_INTEGER counter, freq;
+ if (!QueryPerformanceCounter (&counter)
+ || !QueryPerformanceFrequency (&freq))
+ abort();
- if( freq == I64C(-1) )
- {
- /* Extract from the Tcl source code:
- * (http://www.cs.man.ac.uk/fellowsd-bin/TIP/7.html)
- *
- * Some hardware abstraction layers use the CPU clock
- * in place of the real-time clock as a performance counter
- * reference. This results in:
- * - inconsistent results among the processors on
- * multi-processor systems.
- * - unpredictable changes in performance counter frequency
- * on "gearshift" processors such as Transmeta and
- * SpeedStep.
- * There seems to be no way to test whether the performance
- * counter is reliable, but a useful heuristic is that
- * if its frequency is 1.193182 MHz or 3.579545 MHz, it's
- * derived from a colorburst crystal and is therefore
- * the RTC rather than the TSC. If it's anything else, we
- * presume that the performance counter is unreliable.
- */
- LARGE_INTEGER buf;
-
- freq = ( QueryPerformanceFrequency( &buf ) &&
- (buf.QuadPart == I64C(1193182) || buf.QuadPart == I64C(3579545) ) )
- ? buf.QuadPart : 0;
- }
+ /* Convert to from (1/freq) to microsecond resolution */
+ /* We need to split the division to avoid 63-bits overflow */
+ lldiv_t d = lldiv (counter.QuadPart, freq.QuadPart);
- if( freq != 0 )
- {
- LARGE_INTEGER counter;
- QueryPerformanceCounter (&counter);
-
- /* Convert to from (1/freq) to microsecond resolution */
- /* We need to split the division to avoid 63-bits overflow */
- lldiv_t d = lldiv (counter.QuadPart, freq);
+ res = (d.quot * 1000000) + ((d.rem * 1000000) / freq.QuadPart);
- return (d.quot * 1000000)
- + ((d.rem * 1000000) / freq);
- }
- else
- {
- /* Fallback on GetTickCount() which has a milisecond resolution
- * (actually, best case is about 10 ms resolution)
- * GetTickCount() only returns a DWORD thus will wrap after
- * about 49.7 days so we try to detect the wrapping. */
-
- static CRITICAL_SECTION date_lock;
- static mtime_t i_previous_time = I64C(-1);
- static int i_wrap_counts = -1;
- mtime_t usec_time;
-
- if( i_wrap_counts == -1 )
- {
- /* Initialization */
- i_previous_time = I64C(1000) * GetTickCount();
- InitializeCriticalSection( &date_lock );
- i_wrap_counts = 0;
- }
-
- EnterCriticalSection( &date_lock );
- usec_time = I64C(1000) *
- (i_wrap_counts * I64C(0x100000000) + GetTickCount());
- if( i_previous_time > usec_time )
- {
- /* Counter wrapped */
- i_wrap_counts++;
- usec_time += I64C(0x100000000) * 1000;
- }
- i_previous_time = usec_time;
- LeaveCriticalSection( &date_lock );
-
- return usec_time;
- }
#else
struct timeval tv_date;
/* gettimeofday() cannot fail given &tv_date is a valid address */
(void)gettimeofday( &tv_date, NULL );
- return( (mtime_t) tv_date.tv_sec * 1000000 + (mtime_t) tv_date.tv_usec );
+ res = (mtime_t) tv_date.tv_sec * 1000000 + (mtime_t) tv_date.tv_usec;
#endif
+
+ return res;
}
+#undef mwait
/**
* Wait for a date
*
*/
void mwait( mtime_t date )
{
+ /* If the deadline is already elapsed, or within the clock precision,
+ * do not even bother the system timer. */
+ date -= mprec();
+
#if defined (HAVE_CLOCK_NANOSLEEP)
lldiv_t d = lldiv( date, 1000000 );
struct timespec ts = { d.quot, d.rem * 1000 };
-# if (_POSIX_MONOTONIC_CLOCK - 0 >= 0)
- if( clock_nanosleep( CLOCK_MONOTONIC, TIMER_ABSTIME, &ts, NULL ) )
-# endif
- clock_nanosleep( CLOCK_REALTIME, TIMER_ABSTIME, &ts, NULL );
-#else
+ int val;
+ while( ( val = clock_nanosleep( CLOCK_MONOTONIC, TIMER_ABSTIME, &ts,
+ NULL ) ) == EINTR );
+ if( val == EINVAL )
+ {
+ ts.tv_sec = d.quot; ts.tv_nsec = d.rem * 1000;
+ while( clock_nanosleep( CLOCK_REALTIME, 0, &ts, NULL ) == EINTR );
+ }
+
+#elif defined (WIN32)
+ mtime_t i_total;
+
+ while( (i_total = (date - mdate())) > 0 )
+ {
+ const mtime_t i_sleep = i_total / 1000;
+ DWORD i_delay = (i_sleep > 0x7fffffff) ? 0x7fffffff : i_sleep;
+ vlc_testcancel();
+ SleepEx( i_delay, TRUE );
+ }
+ vlc_testcancel();
+#else
mtime_t delay = date - mdate();
if( delay > 0 )
msleep( delay );
#endif
}
+
+#include "libvlc.h" /* vlc_backtrace() */
+#undef msleep
+
/**
- * More precise sleep()
+ * Portable usleep(). Cancellation point.
*
- * Portable usleep() function.
* \param delay the amount of time to sleep
*/
void msleep( mtime_t delay )
{
-#if defined( HAVE_CLOCK_NANOSLEEP )
+#if defined( HAVE_CLOCK_NANOSLEEP )
lldiv_t d = lldiv( delay, 1000000 );
struct timespec ts = { d.quot, d.rem * 1000 };
-# if (_POSIX_MONOTONIC_CLOCK - 0 >= 0)
- if( clock_nanosleep( CLOCK_MONOTONIC, 0, &ts, NULL ) )
-# endif
- clock_nanosleep( CLOCK_REALTIME, 0, &ts, NULL );
+ int val;
+ while( ( val = clock_nanosleep( CLOCK_MONOTONIC, 0, &ts, &ts ) ) == EINTR );
+ if( val == EINVAL )
+ {
+ ts.tv_sec = d.quot; ts.tv_nsec = d.rem * 1000;
+ while( clock_nanosleep( CLOCK_REALTIME, 0, &ts, &ts ) == EINTR );
+ }
#elif defined( HAVE_KERNEL_OS_H )
snooze( delay );
-#elif defined( PTH_INIT_IN_PTH_H )
- pth_usleep( delay );
-
-#elif defined( ST_INIT_IN_ST_H )
- st_usleep( delay );
-
#elif defined( WIN32 ) || defined( UNDER_CE )
- Sleep( (int) (delay / 1000) );
+ mwait (mdate () + delay);
#elif defined( HAVE_NANOSLEEP )
struct timespec ts_delay;
ts_delay.tv_sec = delay / 1000000;
ts_delay.tv_nsec = (delay % 1000000) * 1000;
- nanosleep( &ts_delay, NULL );
+ while( nanosleep( &ts_delay, &ts_delay ) && ( errno == EINTR ) );
+
+#elif defined (USE_APPLE_MACH)
+ /* The version that should be used, if it was cancelable */
+ pthread_once(&mtime_timebase_info_once, mtime_init_timebase);
+ uint64_t mach_time = delay * 1000 * mtime_timebase_info.denom / mtime_timebase_info.numer;
+ mach_wait_until(mach_time + mach_absolute_time());
#else
struct timeval tv_delay;
tv_delay.tv_sec = delay / 1000000;
tv_delay.tv_usec = delay % 1000000;
- /* select() return value should be tested, since several possible errors
- * can occur. However, they should only happen in very particular occasions
- * (i.e. when a signal is sent to the thread, or when memory is full), and
- * can be ignored. */
+ /* If a signal is caught, you are screwed. Update your OS to nanosleep()
+ * or clock_nanosleep() if this is an issue. */
select( 0, NULL, NULL, NULL, &tv_delay );
#endif
}
void date_Change( date_t *p_date, uint32_t i_divider_n, uint32_t i_divider_d )
{
+ /* change time scale of remainder */
+ p_date->i_remainder = p_date->i_remainder * i_divider_n / p_date->i_divider_num;
p_date->i_divider_num = i_divider_n;
p_date->i_divider_den = i_divider_d;
}
*/
mtime_t date_Increment( date_t *p_date, uint32_t i_nb_samples )
{
- mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000;
- p_date->date += i_dividend / p_date->i_divider_num * p_date->i_divider_den;
+ mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000 * p_date->i_divider_den;
+ p_date->date += i_dividend / p_date->i_divider_num;
p_date->i_remainder += (int)(i_dividend % p_date->i_divider_num);
if( p_date->i_remainder >= p_date->i_divider_num )
{
/* This is Bresenham algorithm. */
- p_date->date += p_date->i_divider_den;
+ assert( p_date->i_remainder < 2*p_date->i_divider_num);
+ p_date->date += 1;
p_date->i_remainder -= p_date->i_divider_num;
}
return p_date->date;
}
+/**
+ * Decrement the date and return the result, taking into account
+ * rounding errors.
+ *
+ * \param date to decrement
+ * \param decrementation in number of samples
+ * \return date value
+ */
+mtime_t date_Decrement( date_t *p_date, uint32_t i_nb_samples )
+{
+ mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000 * p_date->i_divider_den;
+ p_date->date -= i_dividend / p_date->i_divider_num;
+ unsigned i_rem_adjust = i_dividend % p_date->i_divider_num;
+
+ if( p_date->i_remainder < i_rem_adjust )
+ {
+ /* This is Bresenham algorithm. */
+ assert( p_date->i_remainder > -p_date->i_divider_num);
+ p_date->date -= 1;
+ p_date->i_remainder += p_date->i_divider_num;
+ }
+
+ p_date->i_remainder -= i_rem_adjust;
+
+ return p_date->date;
+}
+
+#ifndef HAVE_GETTIMEOFDAY
+
+#ifdef WIN32
+
+/*
+ * Number of micro-seconds between the beginning of the Windows epoch
+ * (Jan. 1, 1601) and the Unix epoch (Jan. 1, 1970).
+ *
+ * This assumes all Win32 compilers have 64-bit support.
+ */
+#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) || defined(__WATCOMC__)
+# define DELTA_EPOCH_IN_USEC 11644473600000000Ui64
+#else
+# define DELTA_EPOCH_IN_USEC 11644473600000000ULL
+#endif
+
+static uint64_t filetime_to_unix_epoch (const FILETIME *ft)
+{
+ uint64_t res = (uint64_t) ft->dwHighDateTime << 32;
+
+ res |= ft->dwLowDateTime;
+ res /= 10; /* from 100 nano-sec periods to usec */
+ res -= DELTA_EPOCH_IN_USEC; /* from Win epoch to Unix epoch */
+ return (res);
+}
+
+static int gettimeofday (struct timeval *tv, void *tz )
+{
+ FILETIME ft;
+ uint64_t tim;
+
+ if (!tv) {
+ return VLC_EGENERIC;
+ }
+ GetSystemTimeAsFileTime (&ft);
+ tim = filetime_to_unix_epoch (&ft);
+ tv->tv_sec = (long) (tim / 1000000L);
+ tv->tv_usec = (long) (tim % 1000000L);
+ return (0);
+}
+
+#endif
+
+#endif
+
/**
* @return NTP 64-bits timestamp in host byte order.
*/