57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
/* hires.h: Definitions for hires clock calculations
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Copyright 2002 Red Hat, Inc.
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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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/* 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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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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virtual LONGLONG usecs (bool justdelta) {return 0LL;}
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};
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class hires_us : hires_base
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{
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LARGE_INTEGER primed_ft;
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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 usecs (bool justdelta);
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};
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class hires_ms : hires_base
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{
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DWORD initime_ms;
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LARGE_INTEGER initime_us;
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static UINT minperiod;
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UINT prime ();
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public:
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LONGLONG usecs (bool justdelta);
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UINT dmsecs () { return timeGetTime (); }
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UINT resolution () { return minperiod ?: prime (); }
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};
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extern hires_ms gtod;
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#endif /*__HIRES_H__*/
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