X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmisc%2Fmtime.c;h=b85c7ef0e3cedca38b14d43142615b18a97f1fa4;hb=a85ee2ea76c47c120fe6aacd3eb07637048afde7;hp=0388a67f6375ecd85ccf1a0a9218eb03395c022d;hpb=edb8e5098aff9a24ab8c52f9e6c875ecb582a097;p=vlc diff --git a/src/misc/mtime.c b/src/misc/mtime.c index 0388a67f63..b85c7ef0e3 100644 --- a/src/misc/mtime.c +++ b/src/misc/mtime.c @@ -1,12 +1,14 @@ /***************************************************************************** * mtime.c: high resolution time management functions - * Functions are prototyped in mtime.h. + * 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 * Rémi Denis-Courmont + * 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 @@ -27,16 +29,15 @@ * Preamble *****************************************************************************/ -#include - -#include /* sprintf() */ -#include /* clock_gettime(), clock_nanosleep() */ -#include /* lldiv() */ +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif +#include -#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */ -# include -#endif +#include /* clock_gettime(), clock_nanosleep() */ +#include +#include #ifdef HAVE_UNISTD_H # include /* select() */ @@ -48,11 +49,20 @@ #if defined( WIN32 ) || defined( UNDER_CE ) # include -#else +# include +#endif + +#if defined(HAVE_SYS_TIME_H) # include #endif -#if defined(HAVE_NANOSLEEP) && !defined(HAVE_STRUCT_TIMESPEC) +#if defined(__APPLE__) && !defined(__powerpc__) && !defined(__ppc__) && !defined(__ppc64__) +#define USE_APPLE_MACH 1 +# include +# include +#endif + +#if !defined(HAVE_STRUCT_TIMESPEC) struct timespec { time_t tv_sec; @@ -64,6 +74,24 @@ struct timespec 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 * @@ -76,7 +104,7 @@ int nanosleep(struct timespec *, struct timespec *); */ 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), @@ -97,33 +125,107 @@ char *mstrtime( char *psz_buffer, mtime_t date ) * \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 ) { -#if defined( HAVE_KERNEL_OS_H ) - return( real_time_clock_usecs() ); + mtime_t res; + +#if defined (HAVE_CLOCK_NANOSLEEP) + struct timespec ts; + + /* Try to use POSIX monotonic clock if available */ + if( clock_gettime( CLOCK_MONOTONIC, &ts ) == EINVAL ) + /* Run-time fallback to real-time clock (always available) */ + (void)clock_gettime( CLOCK_REALTIME, &ts ); + + res = ((mtime_t)ts.tv_sec * (mtime_t)1000000) + + (mtime_t)(ts.tv_nsec / 1000); +#elif defined( HAVE_KERNEL_OS_H ) + 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(); + + /* Convert to nanoseconds */ + date *= mtime_timebase_info.numer; + date /= mtime_timebase_info.denom; + + /* Convert to microseconds */ + res = date / 1000; #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); - mtime_t usec_time; + static mtime_t freq = INT64_C(-1); - if( freq == I64C(-1) ) + if( freq == INT64_C(-1) ) { /* Extract from the Tcl source code: * (http://www.cs.man.ac.uk/fellowsd-bin/TIP/7.html) @@ -143,73 +245,106 @@ mtime_t mdate( void ) * the RTC rather than the TSC. If it's anything else, we * presume that the performance counter is unreliable. */ - - freq = ( QueryPerformanceFrequency( (LARGE_INTEGER *)&freq ) && - (freq == I64C(1193182) || freq == I64C(3579545) ) ) - ? freq : 0; + LARGE_INTEGER buf; + + freq = ( QueryPerformanceFrequency( &buf ) && + (buf.QuadPart == INT64_C(1193182) || buf.QuadPart == INT64_C(3579545) ) ) + ? buf.QuadPart : 0; + +#if defined( WIN32 ) + /* on windows 2000, XP and Vista detect if there are two + cores there - that makes QueryPerformanceFrequency in + any case not trustable? + (may also be true, for single cores with adaptive + CPU frequency and active power management?) + */ + HINSTANCE h_Kernel32 = LoadLibrary(_T("kernel32.dll")); + if(h_Kernel32) + { + void WINAPI (*pf_GetSystemInfo)(LPSYSTEM_INFO); + pf_GetSystemInfo = (void WINAPI (*)(LPSYSTEM_INFO)) + GetProcAddress(h_Kernel32, _T("GetSystemInfo")); + if(pf_GetSystemInfo) + { + SYSTEM_INFO system_info; + pf_GetSystemInfo(&system_info); + if(system_info.dwNumberOfProcessors > 1) + freq = 0; + } + FreeLibrary(h_Kernel32); + } +#endif } if( freq != 0 ) { - /* Microsecond resolution */ - QueryPerformanceCounter( (LARGE_INTEGER *)&usec_time ); - return ( usec_time * 1000000 ) / freq; + 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); } 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 + /* Fallback on timeGetTime() which has a millisecond resolution + * (actually, best case is about 5 ms resolution) + * timeGetTime() 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 mtime_t i_previous_time = INT64_C(-1); static int i_wrap_counts = -1; if( i_wrap_counts == -1 ) { /* Initialization */ - i_previous_time = I64C(1000) * GetTickCount(); +#if defined( WIN32 ) + i_previous_time = INT64_C(1000) * timeGetTime(); +#else + i_previous_time = INT64_C(1000) * GetTickCount(); +#endif 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 ) +#if defined( WIN32 ) + res = INT64_C(1000) * + (i_wrap_counts * INT64_C(0x100000000) + timeGetTime()); +#else + res = INT64_C(1000) * + (i_wrap_counts * INT64_C(0x100000000) + GetTickCount()); +#endif + if( i_previous_time > res ) { /* Counter wrapped */ i_wrap_counts++; - usec_time += I64C(0x100000000000); + res += INT64_C(0x100000000) * 1000; } - i_previous_time = usec_time; + i_previous_time = res; LeaveCriticalSection( &date_lock ); - - return usec_time; } +#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 = date * 1000 * mtime_timebase_info.denom / mtime_timebase_info.numer; + mach_wait_until(mach_time); -#elif 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 - /* Run-time fallback to real-time clock (always available) */ - (void)clock_gettime( CLOCK_REALTIME, &ts ); - - return ((mtime_t)ts.tv_sec * (mtime_t)1000000) - + (mtime_t)(ts.tv_nsec / 1000); #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 * @@ -220,112 +355,71 @@ mtime_t mdate( void ) */ void mwait( mtime_t date ) { -#if defined( HAVE_KERNEL_OS_H ) - mtime_t delay; + /* If the deadline is already elapsed, or within the clock precision, + * do not even bother the system timer. */ + date -= mprec(); - delay = date - real_time_clock_usecs(); - if( delay <= 0 ) - { - return; - } - snooze( delay ); - -#elif defined( WIN32 ) || defined( UNDER_CE ) - mtime_t usec_time, delay; - - usec_time = mdate(); - delay = date - usec_time; - if( delay <= 0 ) - { - return; - } - msleep( delay ); - -#elif defined (HAVE_CLOCK_NANOSLEEP) +#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 - - struct timeval tv_date; - mtime_t delay; /* delay in msec, signed to detect errors */ - - /* see mdate() about gettimeofday() possible errors */ - gettimeofday( &tv_date, NULL ); - - /* calculate delay and check if current date is before wished date */ - delay = date - (mtime_t) tv_date.tv_sec * 1000000 - - (mtime_t) tv_date.tv_usec - - 10000; - - /* Linux/i386 has a granularity of 10 ms. It's better to be in advance - * than to be late. */ - if( delay <= 0 ) /* wished date is now or already passed */ + int val; + while( ( val = clock_nanosleep( CLOCK_MONOTONIC, TIMER_ABSTIME, &ts, + NULL ) ) == EINTR ); + if( val == EINVAL ) { - return; + ts.tv_sec = d.quot; ts.tv_nsec = d.rem * 1000; + while( clock_nanosleep( CLOCK_REALTIME, 0, &ts, NULL ) == EINTR ); } -# if defined( PTH_INIT_IN_PTH_H ) - pth_usleep( delay ); - -# elif defined( ST_INIT_IN_ST_H ) - st_usleep( delay ); - -# else +#elif defined (WIN32) + mtime_t i_total; -# if defined( HAVE_NANOSLEEP ) + while( (i_total = (date - mdate())) > 0 ) { - struct timespec ts_delay; - ts_delay.tv_sec = delay / 1000000; - ts_delay.tv_nsec = (delay % 1000000) * 1000; - - nanosleep( &ts_delay, NULL ); + 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 - tv_date.tv_sec = delay / 1000000; - tv_date.tv_usec = delay % 1000000; - /* see msleep() about select() errors */ - select( 0, NULL, NULL, NULL, &tv_date ); -# endif - -# endif +#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_KERNEL_OS_H ) - snooze( delay ); +#if defined( HAVE_CLOCK_NANOSLEEP ) + lldiv_t d = lldiv( delay, 1000000 ); + struct timespec ts = { d.quot, d.rem * 1000 }; -#elif defined( PTH_INIT_IN_PTH_H ) - pth_usleep( delay ); + 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( ST_INIT_IN_ST_H ) - st_usleep( delay ); +#elif defined( HAVE_KERNEL_OS_H ) + snooze( delay ); #elif defined( WIN32 ) || defined( UNDER_CE ) - Sleep( (int) (delay / 1000) ); - -#elif 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 ); + mwait (mdate () + delay); #elif defined( HAVE_NANOSLEEP ) struct timespec ts_delay; @@ -333,7 +427,13 @@ void msleep( mtime_t 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; @@ -341,12 +441,9 @@ void msleep( mtime_t 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 } @@ -380,6 +477,8 @@ void date_Init( date_t *p_date, uint32_t i_divider_n, uint32_t i_divider_d ) 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; } @@ -428,16 +527,120 @@ void date_Move( date_t *p_date, mtime_t i_difference ) */ 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. + */ +uint64_t NTPtime64 (void) +{ + struct timespec ts; +#if defined (CLOCK_REALTIME) + clock_gettime (CLOCK_REALTIME, &ts); +#else + { + struct timeval tv; + gettimeofday (&tv, NULL); + ts.tv_sec = tv.tv_sec; + ts.tv_nsec = tv.tv_usec * 1000; + } +#endif + + /* Convert nanoseconds to 32-bits fraction (232 picosecond units) */ + uint64_t t = (uint64_t)(ts.tv_nsec) << 32; + t /= 1000000000; + + + /* There is 70 years (incl. 17 leap ones) offset to the Unix Epoch. + * No leap seconds during that period since they were not invented yet. + */ + assert (t < 0x100000000); + t |= ((70LL * 365 + 17) * 24 * 60 * 60 + ts.tv_sec) << 32; + return t; +} +