1 | /* |
2 | Copyright (c) 2005-2019 Intel Corporation |
3 | |
4 | Licensed under the Apache License, Version 2.0 (the "License"); |
5 | you may not use this file except in compliance with the License. |
6 | You may obtain a copy of the License at |
7 | |
8 | http://www.apache.org/licenses/LICENSE-2.0 |
9 | |
10 | Unless required by applicable law or agreed to in writing, software |
11 | distributed under the License is distributed on an "AS IS" BASIS, |
12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | See the License for the specific language governing permissions and |
14 | limitations under the License. |
15 | */ |
16 | |
17 | #ifndef __TBB_tick_count_H |
18 | #define __TBB_tick_count_H |
19 | |
20 | #include "tbb_stddef.h" |
21 | |
22 | #if _WIN32||_WIN64 |
23 | #include "machine/windows_api.h" |
24 | #elif __linux__ |
25 | #include <ctime> |
26 | #else /* generic Unix */ |
27 | #include <sys/time.h> |
28 | #endif /* (choice of OS) */ |
29 | |
30 | namespace tbb { |
31 | |
32 | //! Absolute timestamp |
33 | /** @ingroup timing */ |
34 | class tick_count { |
35 | public: |
36 | //! Relative time interval. |
37 | class interval_t { |
38 | long long value; |
39 | explicit interval_t( long long value_ ) : value(value_) {} |
40 | public: |
41 | //! Construct a time interval representing zero time duration |
42 | interval_t() : value(0) {}; |
43 | |
44 | //! Construct a time interval representing sec seconds time duration |
45 | explicit interval_t( double sec ); |
46 | |
47 | //! Return the length of a time interval in seconds |
48 | double seconds() const; |
49 | |
50 | friend class tbb::tick_count; |
51 | |
52 | //! Extract the intervals from the tick_counts and subtract them. |
53 | friend interval_t operator-( const tick_count& t1, const tick_count& t0 ); |
54 | |
55 | //! Add two intervals. |
56 | friend interval_t operator+( const interval_t& i, const interval_t& j ) { |
57 | return interval_t(i.value+j.value); |
58 | } |
59 | |
60 | //! Subtract two intervals. |
61 | friend interval_t operator-( const interval_t& i, const interval_t& j ) { |
62 | return interval_t(i.value-j.value); |
63 | } |
64 | |
65 | //! Accumulation operator |
66 | interval_t& operator+=( const interval_t& i ) {value += i.value; return *this;} |
67 | |
68 | //! Subtraction operator |
69 | interval_t& operator-=( const interval_t& i ) {value -= i.value; return *this;} |
70 | private: |
71 | static long long ticks_per_second(){ |
72 | #if _WIN32||_WIN64 |
73 | LARGE_INTEGER qpfreq; |
74 | int rval = QueryPerformanceFrequency(&qpfreq); |
75 | __TBB_ASSERT_EX(rval, "QueryPerformanceFrequency returned zero" ); |
76 | return static_cast<long long>(qpfreq.QuadPart); |
77 | #elif __linux__ |
78 | return static_cast<long long>(1E9); |
79 | #else /* generic Unix */ |
80 | return static_cast<long long>(1E6); |
81 | #endif /* (choice of OS) */ |
82 | } |
83 | }; |
84 | |
85 | //! Construct an absolute timestamp initialized to zero. |
86 | tick_count() : my_count(0) {}; |
87 | |
88 | //! Return current time. |
89 | static tick_count now(); |
90 | |
91 | //! Subtract two timestamps to get the time interval between |
92 | friend interval_t operator-( const tick_count& t1, const tick_count& t0 ); |
93 | |
94 | //! Return the resolution of the clock in seconds per tick. |
95 | static double resolution() { return 1.0 / interval_t::ticks_per_second(); } |
96 | |
97 | private: |
98 | long long my_count; |
99 | }; |
100 | |
101 | inline tick_count tick_count::now() { |
102 | tick_count result; |
103 | #if _WIN32||_WIN64 |
104 | LARGE_INTEGER qpcnt; |
105 | int rval = QueryPerformanceCounter(&qpcnt); |
106 | __TBB_ASSERT_EX(rval, "QueryPerformanceCounter failed" ); |
107 | result.my_count = qpcnt.QuadPart; |
108 | #elif __linux__ |
109 | struct timespec ts; |
110 | int status = clock_gettime( CLOCK_REALTIME, &ts ); |
111 | __TBB_ASSERT_EX( status==0, "CLOCK_REALTIME not supported" ); |
112 | result.my_count = static_cast<long long>(1000000000UL)*static_cast<long long>(ts.tv_sec) + static_cast<long long>(ts.tv_nsec); |
113 | #else /* generic Unix */ |
114 | struct timeval tv; |
115 | int status = gettimeofday(&tv, NULL); |
116 | __TBB_ASSERT_EX( status==0, "gettimeofday failed" ); |
117 | result.my_count = static_cast<long long>(1000000)*static_cast<long long>(tv.tv_sec) + static_cast<long long>(tv.tv_usec); |
118 | #endif /*(choice of OS) */ |
119 | return result; |
120 | } |
121 | |
122 | inline tick_count::interval_t::interval_t( double sec ) { |
123 | value = static_cast<long long>(sec*interval_t::ticks_per_second()); |
124 | } |
125 | |
126 | inline tick_count::interval_t operator-( const tick_count& t1, const tick_count& t0 ) { |
127 | return tick_count::interval_t( t1.my_count-t0.my_count ); |
128 | } |
129 | |
130 | inline double tick_count::interval_t::seconds() const { |
131 | return value*tick_count::resolution(); |
132 | } |
133 | |
134 | } // namespace tbb |
135 | |
136 | #endif /* __TBB_tick_count_H */ |
137 | |