e41a52bb
 Hu Chunming
1.优化数据读取线程；2. 添加A...
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/**
* Copyright 1993-2015 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
#ifndef NV_NPP_UTIL_STOP_WATCH_LINUX_H
#define NV_NPP_UTIL_STOP_WATCH_LINUX_H
// includes, system
#include <ctime>
#include <sys/time.h>
namespace npp
{
/// Windows specific implementation of StopWatch
class StopWatchLinux
{
protected:
//! Constructor, default
StopWatchLinux();
// Destructor
~StopWatchLinux();
public:
//! Start time measurement
inline void start();
//! Stop time measurement
inline void stop();
//! Reset time counters to zero
inline void reset();
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned, otherwise the
//! time between the last start() and stop call is returned
inline const double elapsed() const;
private:
// helper functions
//! Get difference between start time and current time
inline double getDiffTime() const;
private:
// member variables
//! Start of measurement
struct timeval start_time;
//! Time difference between the last start and stop
double diff_time;
//! TOTAL time difference between starts and stops
double total_time;
//! flag if the stop watch is running
bool running;
};
// functions, inlined
////////////////////////////////////////////////////////////////////////////////
//! Start time measurement
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::start()
{
gettimeofday(&start_time, 0);
running = true;
}
////////////////////////////////////////////////////////////////////////////////
//! Stop time measurement and increment add to the current diff_time summation
//! variable. Also increment the number of times this clock has been run.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::stop()
{
diff_time = getDiffTime();
total_time += diff_time;
running = false;
}
////////////////////////////////////////////////////////////////////////////////
//! Reset the timer to 0. Does not change the timer running state but does
//! recapture this point in time as the current start time if it is running.
////////////////////////////////////////////////////////////////////////////////
inline void
StopWatchLinux::reset()
{
diff_time = 0;
total_time = 0;
if (running)
{
gettimeofday(&start_time, 0);
}
}
////////////////////////////////////////////////////////////////////////////////
//! Time in msec. after start. If the stop watch is still running (i.e. there
//! was no call to stop()) then the elapsed time is returned added to the
//! current diff_time sum, otherwise the current summed time difference alone
//! is returned.
////////////////////////////////////////////////////////////////////////////////
inline const double
StopWatchLinux::elapsed() const
{
// Return the TOTAL time to date
double retval = total_time;
if (running)
{
retval += getDiffTime();
}
return retval;
}
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
inline double
StopWatchLinux::getDiffTime() const
{
struct timeval t_time;
gettimeofday(&t_time, 0);
// time difference in milli-seconds
return (1000.0 * (t_time.tv_sec - start_time.tv_sec)
+ (0.001 * (t_time.tv_usec - start_time.tv_usec)));
}
} // npp namespace
#endif // NV_NPP_UTIL_STOP_WATCH_LINUX_H
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