-/******************************************************************************
+/*****************************************************************************
* mtime.c: high rezolution time management functions
- * (c)1998 VideoLAN
- ******************************************************************************
* Functions are prototyped in mtime.h.
- ******************************************************************************
- * to-do list:
+ *****************************************************************************
+ * Copyright (C) 1998-2001 VideoLAN
+ * $Id: mtime.c,v 1.33 2002/07/12 21:57:25 massiot Exp $
+ *
+ * Authors: Vincent Seguin <seguin@via.ecp.fr>
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ *****************************************************************************/
+
+/*
+ * TODO:
* see if using Linux real-time extensions is possible and profitable
- ******************************************************************************/
+ */
-/******************************************************************************
+/*****************************************************************************
* Preamble
- ******************************************************************************/
-#include <stdio.h>
-#include <sys/time.h>
+ *****************************************************************************/
+#include <stdio.h> /* sprintf() */
+
+#include <vlc/vlc.h>
+
+#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */
+# include <pth.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h> /* select() */
+#endif
-#include "common.h"
-#include "mtime.h"
+#ifdef HAVE_KERNEL_OS_H
+# include <kernel/OS.h>
+#endif
+
+#if defined( WIN32 )
+# include <windows.h>
+#else
+# include <sys/time.h>
+#endif
+
+#if defined(HAVE_NANOSLEEP) && !defined(HAVE_STRUCT_TIMESPEC)
+struct timespec
+{
+ time_t tv_sec;
+ int32_t tv_nsec;
+};
+#endif
-/******************************************************************************
+#if defined(HAVE_NANOSLEEP) && !defined(HAVE_DECL_NANOSLEEP)
+int nanosleep(struct timespec *, struct timespec *);
+#endif
+
+/*****************************************************************************
* mstrtime: return a date in a readable format
- ******************************************************************************
+ *****************************************************************************
* This functions is provided for any interface function which need to print a
* date. psz_buffer should be a buffer long enough to store the formatted
* date.
- ******************************************************************************/
+ *****************************************************************************/
char *mstrtime( char *psz_buffer, mtime_t date )
{
sprintf( psz_buffer, "%02d:%02d:%02d-%03d.%03d",
- (int) (date / (1000LL * 1000LL * 60LL * 60LL) % 24LL),
- (int) (date / (1000LL * 1000LL * 60LL) % 60LL),
- (int) (date / (1000LL * 1000LL) % 60LL),
- (int) (date / 1000LL % 1000LL),
- (int) (date % 1000LL) );
+ (int) (date / (I64C(1000) * I64C(1000) * I64C(60) * I64C(60)) % I64C(24)),
+ (int) (date / (I64C(1000) * I64C(1000) * I64C(60)) % I64C(60)),
+ (int) (date / (I64C(1000) * I64C(1000)) % I64C(60)),
+ (int) (date / I64C(1000) % I64C(1000)),
+ (int) (date % I64C(1000)) );
return( psz_buffer );
}
-/******************************************************************************
- * mdate: return high precision date (inline function)
- ******************************************************************************
+/*****************************************************************************
+ * mdate: return high precision date
+ *****************************************************************************
* Uses the gettimeofday() function when possible (1 MHz resolution) or the
* ftime() function (1 kHz resolution).
- ******************************************************************************
- * to-do list: ??
- * implement the function when gettimeofday is not available
- * this function should be decalred as inline
- ******************************************************************************/
+ *****************************************************************************/
mtime_t mdate( void )
{
+#if defined( HAVE_KERNEL_OS_H )
+ return( real_time_clock_usecs() );
+
+#elif defined( WIN32 )
+ /* We don't get the real date, just the value of a high precision timer.
+ * this is because the usual time functions have at best only a milisecond
+ * resolution */
+ mtime_t freq, usec_time;
+
+ if( QueryPerformanceFrequency( (LARGE_INTEGER *)&freq ) )
+ {
+ /* Microsecond resolution */
+ QueryPerformanceCounter( (LARGE_INTEGER *)&usec_time );
+ return ( usec_time * 1000000 ) / freq;
+ }
+
+ /* Milisecond resolution */
+ return 1000 * GetTickCount();
+
+#else
struct timeval tv_date;
/* gettimeofday() could return an error, and should be tested. However, the
* here, since tv is a local variable. */
gettimeofday( &tv_date, NULL );
return( (mtime_t) tv_date.tv_sec * 1000000 + (mtime_t) tv_date.tv_usec );
+
+#endif
}
-/******************************************************************************
- * mwait: wait for a date (inline function)
- ******************************************************************************
+/*****************************************************************************
+ * mwait: wait for a date
+ *****************************************************************************
* This function uses select() and an system date function to wake up at a
* precise date. It should be used for process synchronization. If current date
* is posterior to wished date, the function returns immediately.
- ******************************************************************************
- * to-do list:
- * implement the function when gettimeofday is not available
- * optimize delay calculation
- * ?? declare as inline
- ******************************************************************************/
+ *****************************************************************************/
void mwait( mtime_t date )
{
- struct timeval tv_date, tv_delay;
- mtime_t delay; /* delay in msec, signed to detect errors */
+#if defined( HAVE_KERNEL_OS_H )
+ mtime_t delay;
+
+ delay = date - real_time_clock_usecs();
+ if( delay <= 0 )
+ {
+ return;
+ }
+ snooze( delay );
+
+#elif defined( WIN32 )
+ mtime_t usec_time, delay;
+
+ usec_time = mdate();
+ delay = date - usec_time;
+ if( delay <= 0 )
+ {
+ return;
+ }
+ msleep( delay );
+
+#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;
- if( delay <= 0 ) /* wished date is now or already passed */
+ 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 */
{
return;
}
- tv_delay.tv_sec = delay / 1000000;
- tv_delay.tv_usec = delay % 1000000;
+# if defined( PTH_INIT_IN_PTH_H )
+ pth_usleep( delay );
+
+# elif defined( ST_INIT_IN_ST_H )
+ st_usleep( delay );
+
+# else
+
+# if defined( HAVE_NANOSLEEP )
+ {
+ struct timespec ts_delay;
+ ts_delay.tv_sec = delay / 1000000;
+ ts_delay.tv_nsec = (delay % 1000000) * 1000;
+
+ nanosleep( &ts_delay, NULL );
+ }
+
+# else
+ tv_date.tv_sec = delay / 1000000;
+ tv_date.tv_usec = delay % 1000000;
/* see msleep() about select() errors */
- select( 0, NULL, NULL, NULL, &tv_delay );
+ select( 0, NULL, NULL, NULL, &tv_date );
+# endif
+
+# endif
+
+#endif
}
-/******************************************************************************
- * msleep: more precise sleep() (inline function) (ok ?)
- ******************************************************************************
- * This function uses select() in a classical way to implement a sleep() call
- * with a microsecond precision.
- * For synchronization purposes, mwait() should be prefered.
- ******************************************************************************
- * ?? decalre as inline
- ******************************************************************************/
+/*****************************************************************************
+ * msleep: more precise sleep()
+ *****************************************************************************
+ * Portable usleep() function.
+ *****************************************************************************/
void msleep( mtime_t delay )
{
+#if 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 )
+ Sleep( (int) (delay / 1000) );
+
+#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 );
+
+#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 ingnored. */
+ * can be ignored. */
select( 0, NULL, NULL, NULL, &tv_delay );
+
+#endif
}
+
projects / vlc / blobdiff