-/******************************************************************************
+/*****************************************************************************
* mtime.c: high rezolution time management functions
- * (c)1998 VideoLAN
- ******************************************************************************
* Functions are prototyped in mtime.h.
- ******************************************************************************
- * to-do list:
+ *****************************************************************************
+ * Copyright (C) 1998, 1999, 2000 VideoLAN
+ * $Id: mtime.c,v 1.24 2001/06/28 22:12:04 gbazin 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 <unistd.h>
-#include <sys/time.h>
+ *****************************************************************************/
+#include "defs.h"
+
+#include <stdio.h> /* sprintf() */
+
+#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */
+# include <pth.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h> /* select() */
+#endif
+
+#ifdef HAVE_KERNEL_OS_H
+# include <kernel/OS.h>
+#endif
+
+#if defined( WIN32 )
+# include <windows.h>
+#else
+# include <sys/time.h>
+#endif
+#include "config.h"
#include "common.h"
#include "mtime.h"
-/******************************************************************************
+/*****************************************************************************
* 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)
- ******************************************************************************
+ *****************************************************************************
* Uses the gettimeofday() function when possible (1 MHz resolution) or the
* ftime() function (1 kHz resolution).
- ******************************************************************************/
+ *****************************************************************************/
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;
+ }
+ else
+ {
+ /* 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)
- ******************************************************************************
+ *****************************************************************************
* 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.
- ******************************************************************************/
+ *****************************************************************************/
void mwait( mtime_t date )
{
+#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
+
+# ifdef HAVE_USLEEP
+ struct timeval tv_date;
+# else
struct timeval tv_date, tv_delay;
- mtime_t delay; /* delay in msec, signed to detect errors */
+# endif
+ 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;
}
-#ifndef usleep
+
+# if defined( PTH_INIT_IN_PTH_H )
+ pth_usleep( delay );
+
+# elif defined( HAVE_USLEEP )
+ usleep( delay );
+
+# else
tv_delay.tv_sec = delay / 1000000;
tv_delay.tv_usec = delay % 1000000;
-
/* see msleep() about select() errors */
select( 0, NULL, NULL, NULL, &tv_delay );
-#else
- usleep( delay );
+
+# endif
+
#endif
}
-/******************************************************************************
+/*****************************************************************************
* msleep: more precise sleep() (inline function) (ok ?)
- ******************************************************************************
+ *****************************************************************************
* Portable usleep() function.
- ******************************************************************************/
+ *****************************************************************************/
void msleep( mtime_t delay )
{
-#ifndef usleep
+#if defined( HAVE_KERNEL_OS_H )
+ snooze( delay );
+
+#elif defined( PTH_INIT_IN_PTH_H )
+ struct timeval tv_delay;
+ tv_delay.tv_sec = delay / 1000000;
+ tv_delay.tv_usec = delay % 1000000;
+ pth_select( 0, NULL, NULL, NULL, &tv_delay );
+
+#elif defined( HAVE_USLEEP )
+ usleep( delay );
+
+#elif defined( WIN32 )
+ Sleep( (int) (delay / 1000) );
+
+#else
struct timeval tv_delay;
tv_delay.tv_sec = delay / 1000000;
* (i.e. when a signal is sent to the thread, or when memory is full), and
* can be ingnored. */
select( 0, NULL, NULL, NULL, &tv_delay );
-#else
- usleep( delay );
+
#endif
}
+
projects / vlc / blobdiff