72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/* hires.h: Definitions for hires clock calculations
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#ifndef __HIRES_H__
|
|
#define __HIRES_H__
|
|
|
|
#include <mmsystem.h>
|
|
|
|
/* Conversions for per-process and per-thread clocks */
|
|
#define PID_TO_CLOCKID(pid) (pid * 8 + CLOCK_PROCESS_CPUTIME_ID)
|
|
#define CLOCKID_TO_PID(cid) ((cid - CLOCK_PROCESS_CPUTIME_ID) / 8)
|
|
#define CLOCKID_IS_PROCESS(cid) ((cid % 8) == CLOCK_PROCESS_CPUTIME_ID)
|
|
#define THREADID_TO_CLOCKID(tid) (tid * 8 + CLOCK_THREAD_CPUTIME_ID)
|
|
#define CLOCKID_TO_THREADID(cid) ((cid - CLOCK_THREAD_CPUTIME_ID) / 8)
|
|
#define CLOCKID_IS_THREAD(cid) ((cid % 8) == CLOCK_THREAD_CPUTIME_ID)
|
|
|
|
/* Largest delay in ms for sleep and alarm calls.
|
|
Allow actual delay to exceed requested delay by 10 s.
|
|
Express as multiple of 1000 (i.e. seconds) + max resolution
|
|
The tv_sec argument in timeval structures cannot exceed
|
|
HIRES_DELAY_MAX / 1000 - 1, so that adding fractional part
|
|
and rounding won't exceed HIRES_DELAY_MAX */
|
|
#define HIRES_DELAY_MAX ((((UINT_MAX - 10000) / 1000) * 1000) + 10)
|
|
|
|
/* 100ns difference between Windows and UNIX timebase. */
|
|
#define FACTOR (0x19db1ded53e8000LL)
|
|
/* # of nanosecs per second. */
|
|
#define NSPERSEC (1000000000LL)
|
|
/* # of 100ns intervals per second. */
|
|
#define NS100PERSEC (10000000LL)
|
|
/* # of microsecs per second. */
|
|
#define USPERSEC (1000000LL)
|
|
/* # of millisecs per second. */
|
|
#define MSPERSEC (1000L)
|
|
|
|
class hires_base
|
|
{
|
|
protected:
|
|
int inited;
|
|
public:
|
|
void reset() {inited = false;}
|
|
};
|
|
|
|
class hires_ns : public hires_base
|
|
{
|
|
LARGE_INTEGER primed_pc;
|
|
double freq;
|
|
void prime ();
|
|
public:
|
|
LONGLONG nsecs (bool monotonic = false);
|
|
LONGLONG usecs () {return nsecs () / 1000LL;}
|
|
LONGLONG resolution();
|
|
};
|
|
|
|
class hires_ms : public hires_base
|
|
{
|
|
public:
|
|
LONGLONG nsecs ();
|
|
LONGLONG usecs () {return nsecs () / 10LL;}
|
|
LONGLONG msecs () {return nsecs () / 10000LL;}
|
|
UINT resolution ();
|
|
};
|
|
|
|
extern hires_ms gtod;
|
|
extern hires_ns ntod;
|
|
#endif /*__HIRES_H__*/
|