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/// @module system
/// Time.
// @section time
#include <lua.h>
#include <lauxlib.h>
#ifdef _WIN32
#include <float.h>
#include <limits.h>
#include <windows.h>
#else
#include <time.h>
#include <sys/time.h>
#endif
#ifdef __APPLE__
#include <AvailabilityMacros.h>
#ifndef MAC_OS_X_VERSION_10_12
#define MAC_OS_X_VERSION_10_12 101200
#endif
#define HAVE_CLOCK_GETTIME (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12 || defined(CLOCK_MONOTONIC))
#if !(HAVE_CLOCK_GETTIME)
#include "time_osx.h"
#endif
#endif
#include "compat.h"
/*-------------------------------------------------------------------------
* Gets time in s, relative to January 1, 1970 (UTC)
* Returns
* time in s.
*-------------------------------------------------------------------------*/
#ifdef _WIN32
static double time_gettime(void) {
FILETIME ft;
double t;
GetSystemTimeAsFileTime(&ft);
/* Windows file time (time since January 1, 1601 (UTC)) */
t = ft.dwLowDateTime*1.0e-7 + ft.dwHighDateTime*(4294967296.0*1.0e-7);
/* convert to Unix Epoch time (time since January 1, 1970 (UTC)) */
return (t - 11644473600.0);
}
#else
static double time_gettime(void) {
struct timeval v;
gettimeofday(&v, (struct timezone *) NULL);
/* Unix Epoch time (time since January 1, 1970 (UTC)) */
return v.tv_sec + v.tv_usec*1.0e-6;
}
#endif
#ifdef _WIN32
WINBASEAPI ULONGLONG WINAPI GetTickCount64(VOID);
static double time_monotime(void) {
ULONGLONG ms = GetTickCount64();
return ms*1.0e-3;
}
#else
static double time_monotime(void) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec + ts.tv_nsec*1.0e-9;
}
#endif
/***
Get system time.
The time is returned as the seconds since the epoch (1 January 1970 00:00:00).
@function gettime
@treturn number seconds (fractional)
*/
static int time_lua_gettime(lua_State *L)
{
lua_pushnumber(L, time_gettime());
return 1;
}
/***
Get monotonic time.
The time is returned as the seconds since system start.
@function monotime
@treturn number seconds (fractional)
*/
static int time_lua_monotime(lua_State *L)
{
lua_pushnumber(L, time_monotime());
return 1;
}
/***
Sleep without a busy loop.
This function will sleep, without doing a busy-loop and wasting CPU cycles.
@function sleep
@tparam number seconds seconds to sleep (fractional).
@tparam[opt=16] integer precision minimum stepsize in milliseconds (Windows only, ignored elsewhere)
@return `true` on success, or `nil+err` on failure
*/
#ifdef _WIN32
static int time_lua_sleep(lua_State *L)
{
double n = luaL_checknumber(L, 1);
int precision = luaL_optinteger(L, 2, 16);
if (precision < 0 || precision > 16) precision = 16;
if (n > 0.0) {
if (n < DBL_MAX/1000.0) n *= 1000.0;
if (n > INT_MAX) n = INT_MAX;
if (timeBeginPeriod(precision) != TIMERR_NOERROR) {
lua_pushnil(L);
lua_pushstring(L, "failed to set timer precision");
return 2;
};
Sleep((int)n);
timeEndPeriod(precision);
}
lua_pushboolean(L, 1);
return 1;
}
#else
static int time_lua_sleep(lua_State *L)
{
double n = luaL_checknumber(L, 1);
struct timespec t, r;
if (n > 0.0) {
if (n > INT_MAX) n = INT_MAX;
t.tv_sec = (int) n;
n -= t.tv_sec;
t.tv_nsec = (int) (n * 1000000000);
if (t.tv_nsec >= 1000000000) t.tv_nsec = 999999999;
while (nanosleep(&t, &r) != 0) {
t.tv_sec = r.tv_sec;
t.tv_nsec = r.tv_nsec;
}
}
lua_pushboolean(L, 1);
return 1;
}
#endif
static luaL_Reg func[] = {
{ "gettime", time_lua_gettime },
{ "monotime", time_lua_monotime },
{ "sleep", time_lua_sleep },
{ NULL, NULL }
};
/*-------------------------------------------------------------------------
* Initializes module
*-------------------------------------------------------------------------*/
void time_open(lua_State *L) {
luaL_setfuncs(L, func, 0);
}
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