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PO
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Id
1861337
data
AcceptedAnswerId
0
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0
ClosedDate
CommentCount
5
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CreationDate
2009-12-07T17:01:57.787
FavoriteCount
0
LastActivityDate
2015-04-10T19:55:24.313
LastEditDate
2015-04-10T19:55:24.313
LastEditorUserId
95135
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95135
ParentId
1861294
PostTypeId
2
Score
110
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0
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text
Body
You can use this function I wrote. You call <code>GetTimeMs64()</code>, and it returns the number of milliseconds elapsed since the unix epoch using the system clock - the just like <code>time(NULL)</code>, except in milliseconds. It works on both windows and linux; it is thread safe. Note that the granularity is 15 ms on windows; on linux it is implementation dependent, but it usually 15 ms as well. <pre><code>#ifdef _WIN32 #include <Windows.h> #else #include <sys/time.h> #include <ctime> #endif /* Remove if already defined */ typedef long long int64; typedef unsigned long long uint64; /* Returns the amount of milliseconds elapsed since the UNIX epoch. Works on both * windows and linux. */ uint64 GetTimeMs64() { #ifdef _WIN32 /* Windows */ FILETIME ft; LARGE_INTEGER li; /* Get the amount of 100 nano seconds intervals elapsed since January 1, 1601 (UTC) and copy it * to a LARGE_INTEGER structure. */ GetSystemTimeAsFileTime(&ft); li.LowPart = ft.dwLowDateTime; li.HighPart = ft.dwHighDateTime; uint64 ret = li.QuadPart; ret -= 116444736000000000LL; /* Convert from file time to UNIX epoch time. */ ret /= 10000; /* From 100 nano seconds (10^-7) to 1 millisecond (10^-3) intervals */ return ret; #else /* Linux */ struct timeval tv; gettimeofday(&tv, NULL); uint64 ret = tv.tv_usec; /* Convert from micro seconds (10^-6) to milliseconds (10^-3) */ ret /= 1000; /* Adds the seconds (10^0) after converting them to milliseconds (10^-3) */ ret += (tv.tv_sec * 1000); return ret; #endif } </code></pre>
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1. POHow to Calculate Execution Time of a Code Snippet in C++
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1. PTAnswer
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1. USAndreas Bonini
UserOwnerUserId
1. USAndreas Bonini
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1. POHow to Calculate Execution Time of a Code Snippet in C++
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