Created
January 4, 2015 21:48
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// clang++ BadTimer.cpp -fPIC -shared -O3 -std=c++11 -o BadTimer.dylib | |
#include <chrono> | |
class BadTimer { | |
private: | |
std::chrono::high_resolution_clock::time_point startTime; | |
std::chrono::high_resolution_clock::time_point endTime; | |
std::chrono::duration<double> timeSpan; | |
public: | |
BadTimer( void ); | |
double getElapsedTime( void ); | |
}; | |
BadTimer::BadTimer( void ) { | |
startTime = std::chrono::high_resolution_clock::now( ); | |
} | |
double BadTimer::getElapsedTime( void ) { | |
endTime = std::chrono::high_resolution_clock::now( ); | |
timeSpan = std::chrono::duration_cast<std::chrono::duration<double>>(endTime - startTime); | |
return timeSpan.count( ); | |
} | |
extern "C" { | |
void* startTimer( void ) { | |
return new BadTimer; | |
} | |
double getDuration( BadTimer *badTimer ) { | |
return badTimer->getElapsedTime( ); | |
} | |
void freeTimer( BadTimer *badTimer ) { | |
delete badTimer; | |
} | |
} |
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ffi = require"ffi" | |
ffi.cdef[[ | |
void* startTimer( void ); | |
double getDuration( void* ); | |
void freeTimer( void* ); | |
]] | |
badTimer = ffi.load"./BadTimer.dylib" | |
bad = badTimer.startTimer( ) | |
print(("%g us"):format(badTimer.getDuration(bad)*1000000)) | |
print(("%g us"):format(badTimer.getDuration(bad)*1000000)) | |
print(("%g us"):format(badTimer.getDuration(bad)*1000000)) | |
badTimer.freeTimer(bad) |
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