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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: System-dependent time functions.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "assert.h"
#ifdef __GNUC__
#define LL_LITERAL(X) X##LL
#else
#define LL_LITERAL(X) X##i64
#endif
/******************* Routines for time measurement *********************/
#define EPOCH_JULIAN_DIFF LL_LITERAL(11644473600)
static SysHrTime wrap = 0;
static DWORD last_tick_count = 0;
int
sys_init_time(void)
{
return 1;
}
void
sys_gettimeofday(SysTimeval *tv)
{
SYSTEMTIME t;
FILETIME ft;
LONGLONG lft;
GetSystemTime(&t);
SystemTimeToFileTime(&t, &ft);
memcpy(&lft, &ft, sizeof(lft));
tv->tv_usec = (erts_time_t) ((lft / LL_LITERAL(10)) % LL_LITERAL(1000000));
tv->tv_sec = (erts_time_t) ((lft / LL_LITERAL(10000000)) - EPOCH_JULIAN_DIFF);
}
SysHrTime
sys_gethrtime(void)
{
DWORD ticks = (SysHrTime) (GetTickCount() & 0x7FFFFFFF);
if (ticks < (SysHrTime) last_tick_count) {
wrap += LL_LITERAL(1) << 31;
}
last_tick_count = ticks;
return ((((LONGLONG) ticks) + wrap) * LL_LITERAL(1000000));
}
clock_t
sys_times(SysTimes *buffer) {
clock_t kernel_ticks = (GetTickCount() /
(1000 / SYS_CLK_TCK)) & 0x7FFFFFFF;
FILETIME dummy;
LONGLONG user;
LONGLONG system;
buffer->tms_utime = buffer->tms_stime = buffer->tms_cutime =
buffer->tms_cstime = 0;
if (GetProcessTimes(GetCurrentProcess(), &dummy, &dummy,
(FILETIME *) &system, (FILETIME *) &user) == 0)
return kernel_ticks;
system /= (LONGLONG)(10000000 / SYS_CLK_TCK);
user /= (LONGLONG)(10000000 / SYS_CLK_TCK);
buffer->tms_utime = (clock_t) (user & LL_LITERAL(0x7FFFFFFF));
buffer->tms_stime = (clock_t) (system & LL_LITERAL(0x7FFFFFFF));
return kernel_ticks;
}
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