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/* stopwatch.h - Helper code for timing
* Copyright (C) 2013 g10 Code GmbH
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
*/
#include <time.h>
#ifdef _WIN32
# include <winsock2.h>
# include <windows.h>
#else
# include <sys/times.h>
#endif
#ifdef _WIN32
struct
{
FILETIME creation_time, exit_time, kernel_time, user_time;
} started_at, stopped_at;
#else
static clock_t started_at, stopped_at;
#endif
static void
start_timer (void)
{
#ifdef _WIN32
#ifdef __MINGW32CE__
GetThreadTimes (GetCurrentThread (),
&started_at.creation_time, &started_at.exit_time,
&started_at.kernel_time, &started_at.user_time);
#else
GetProcessTimes (GetCurrentProcess (),
&started_at.creation_time, &started_at.exit_time,
&started_at.kernel_time, &started_at.user_time);
#endif
stopped_at = started_at;
#else
struct tms tmp;
times (&tmp);
started_at = stopped_at = tmp.tms_utime;
#endif
}
static void
stop_timer (void)
{
#ifdef _WIN32
#ifdef __MINGW32CE__
GetThreadTimes (GetCurrentThread (),
&stopped_at.creation_time, &stopped_at.exit_time,
&stopped_at.kernel_time, &stopped_at.user_time);
#else
GetProcessTimes (GetCurrentProcess (),
&stopped_at.creation_time, &stopped_at.exit_time,
&stopped_at.kernel_time, &stopped_at.user_time);
#endif
#else
struct tms tmp;
times (&tmp);
stopped_at = tmp.tms_utime;
#endif
}
static const char *
elapsed_time (unsigned int divisor)
{
static char buf[50];
#if _WIN32
unsigned long long t1, t2, t;
t1 = (((unsigned long long)started_at.kernel_time.dwHighDateTime << 32)
+ started_at.kernel_time.dwLowDateTime);
t1 += (((unsigned long long)started_at.user_time.dwHighDateTime << 32)
+ started_at.user_time.dwLowDateTime);
t2 = (((unsigned long long)stopped_at.kernel_time.dwHighDateTime << 32)
+ stopped_at.kernel_time.dwLowDateTime);
t2 += (((unsigned long long)stopped_at.user_time.dwHighDateTime << 32)
+ stopped_at.user_time.dwLowDateTime);
t = ((t2 - t1)/divisor)/10000;
if (divisor != 1)
snprintf (buf, sizeof buf, "%5.1fms", (double)t );
else
snprintf (buf, sizeof buf, "%5.0fms", (double)t );
#else
if (divisor != 1)
snprintf (buf, sizeof buf, "%5.1fms",
((((double) (stopped_at - started_at)/(double)divisor)
/CLOCKS_PER_SEC)*10000000));
else
snprintf (buf, sizeof buf, "%5.0fms",
(((double) (stopped_at - started_at)/CLOCKS_PER_SEC)*10000000));
#endif
return buf;
}