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/*
* The MIT License
*
* Copyright (C) 2015-2017 Alexander Saprykin <saprykin.spb@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* 'Software'), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* https://msdn.microsoft.com/ru-ru/library/windows/desktop/dn553408(v=vs.85).aspx */
#include "ptimeprofiler.h"
#include "ptimeprofiler-private.h"
#include <time.h>
#if PLIBSYS_HAS_LLDIV
# include <stdlib.h>
#endif
typedef puint64 (WINAPI * PWin32TicksFunc) (void);
typedef puint64 (* PWin32ElapsedFunc) (puint64 last_counter);
static PWin32TicksFunc pp_time_profiler_ticks_func = NULL;
static PWin32ElapsedFunc pp_time_profiler_elapsed_func = NULL;
static puint64 pp_time_profiler_freq = 1;
static puint64 WINAPI pp_time_profiler_get_hr_ticks (void);
static puint64 pp_time_profiler_elapsed_hr (puint64 last_counter);
static puint64 pp_time_profiler_elapsed_tick64 (puint64 last_counter);
static puint64 pp_time_profiler_elapsed_tick (puint64 last_counter);
static puint64 WINAPI
pp_time_profiler_get_hr_ticks (void)
{
LARGE_INTEGER tcounter;
if (P_UNLIKELY (QueryPerformanceCounter (&tcounter) == FALSE)) {
P_ERROR ("PTimeProfiler::pp_time_profiler_get_hr_ticks: QueryPerformanceCounter() failed");
tcounter.QuadPart = 0;
}
return (puint64) tcounter.QuadPart;
}
static puint64
pp_time_profiler_elapsed_hr (puint64 last_counter)
{
puint64 ticks;
#ifdef PLIBSYS_HAS_LLDIV
lldiv_t ldres;
#endif
puint64 quot;
puint64 rem;
ticks = pp_time_profiler_ticks_func () - last_counter;
#ifdef PLIBSYS_HAS_LLDIV
ldres = lldiv ((long long) ticks, (long long) pp_time_profiler_freq);
quot = ldres.quot;
rem = ldres.rem;
#else
quot = ticks / pp_time_profiler_freq;
rem = ticks % pp_time_profiler_freq;
#endif
return (puint64) (quot * 1000000 + (rem * 1000000) / pp_time_profiler_freq);
}
static puint64
pp_time_profiler_elapsed_tick64 (puint64 last_counter)
{
return (pp_time_profiler_ticks_func () - last_counter) * 1000;
}
static puint64
pp_time_profiler_elapsed_tick (puint64 last_counter)
{
puint64 val;
puint64 high_bit;
high_bit = 0;
val = pp_time_profiler_ticks_func ();
if (P_UNLIKELY (val < last_counter))
high_bit = 1;
return ((val | (high_bit << 32)) - last_counter) * 1000;
}
puint64
p_time_profiler_get_ticks_internal ()
{
return pp_time_profiler_ticks_func ();
}
puint64
p_time_profiler_elapsed_usecs_internal (const PTimeProfiler *profiler)
{
return pp_time_profiler_elapsed_func (profiler->counter);
}
void
p_time_profiler_init (void)
{
LARGE_INTEGER tcounter;
HMODULE hmodule;
pboolean has_qpc;
has_qpc = (QueryPerformanceCounter (&tcounter) != 0 && tcounter.QuadPart != 0) ? TRUE : FALSE;
if (has_qpc == TRUE) {
if (P_UNLIKELY (QueryPerformanceFrequency (&tcounter) == 0)) {
P_ERROR ("PTimeProfiler::p_time_profiler_init: QueryPerformanceFrequency() failed");
has_qpc = FALSE;
} else {
pp_time_profiler_freq = (puint64) (tcounter.QuadPart);
pp_time_profiler_ticks_func = (PWin32TicksFunc) pp_time_profiler_get_hr_ticks;
pp_time_profiler_elapsed_func = (PWin32ElapsedFunc) pp_time_profiler_elapsed_hr;
}
}
if (P_UNLIKELY (has_qpc == FALSE)) {
hmodule = GetModuleHandleA ("kernel32.dll");
if (P_UNLIKELY (hmodule == NULL)) {
P_ERROR ("PTimeProfiler::p_time_profiler_init: failed to load kernel32.dll module");
return;
}
pp_time_profiler_ticks_func = (PWin32TicksFunc) GetProcAddress (hmodule, "GetTickCount64");
pp_time_profiler_elapsed_func = (PWin32ElapsedFunc) pp_time_profiler_elapsed_tick64;
if (P_UNLIKELY (pp_time_profiler_ticks_func == NULL)) {
pp_time_profiler_ticks_func = (PWin32TicksFunc) GetProcAddress (hmodule, "GetTickCount");
pp_time_profiler_elapsed_func = (PWin32ElapsedFunc) pp_time_profiler_elapsed_tick;
}
if (P_UNLIKELY (pp_time_profiler_ticks_func == NULL)) {
P_ERROR ("PTimeProfiler::p_time_profiler_init: no reliable tick counter");
pp_time_profiler_elapsed_func = NULL;
}
}
}
void
p_time_profiler_shutdown (void)
{
pp_time_profiler_freq = 1;
pp_time_profiler_ticks_func = NULL;
pp_time_profiler_elapsed_func = NULL;
}
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