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timing.h
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1 //
2 // Copyright 2016 Pixar
3 //
4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
6 // compliance with the Apache License and the following modification to it:
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24 #ifndef ARCH_TIMING_H
25 #define ARCH_TIMING_H
26 
30 
31 #include "pxr/pxr.h"
32 #include "pxr/base/arch/api.h"
33 #include "pxr/base/arch/defines.h"
34 #include "pxr/base/arch/inttypes.h"
35 
38 
39 #if defined(ARCH_OS_LINUX)
40 #include <x86intrin.h>
41 #elif defined(ARCH_OS_DARWIN)
42 #include <mach/mach_time.h>
43 #elif defined(ARCH_OS_WINDOWS)
44 #include <intrin.h>
45 #endif
46 
47 PXR_NAMESPACE_OPEN_SCOPE
48 
54 #define ARCH_CLK_TCK 100
55 
63 inline uint64_t
65 {
66 #if defined(ARCH_OS_DARWIN)
67  // On Darwin we'll use mach_absolute_time().
68  return mach_absolute_time();
69 #elif defined(ARCH_CPU_INTEL)
70  // On Intel we'll use the rdtsc instruction.
71  return __rdtsc();
72 #else
73 #error Unknown architecture.
74 #endif
75 }
76 
90 ARCH_API
91 int64_t ArchTicksToNanoseconds(uint64_t nTicks);
92 
95 ARCH_API
96 double ArchTicksToSeconds(uint64_t nTicks);
97 
100 ARCH_API
101 uint64_t ArchSecondsToTicks(double seconds);
102 
105 ARCH_API
107 
109 
110 PXR_NAMESPACE_CLOSE_SCOPE
111 
112 #endif // ARCH_TIMING_H
ARCH_API double ArchTicksToSeconds(uint64_t nTicks)
Convert a duration measured in &quot;ticks&quot;, as returned by ArchGetTickTime(), to seconds.
uint64_t ArchGetTickTime()
Return the current time in system-dependent units.
Definition: timing.h:64
ARCH_API double ArchGetNanosecondsPerTick()
Get nanoseconds per tick.
ARCH_API int64_t ArchTicksToNanoseconds(uint64_t nTicks)
Convert a duration measured in &quot;ticks&quot;, as returned by ArchGetTickTime(), to nanoseconds.
ARCH_API uint64_t ArchSecondsToTicks(double seconds)
Convert a duration in seconds to &quot;ticks&quot;, as returned by ArchGetTickTime().