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