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/**
* \file os_ticks.c
* \brief Return the system tick counter (in microsecond units).
*/
#include <stdlib.h>
#include "premake.h"
// Epochs used by Windows and Unix time APIs. These adjustments,
// when added to the time value returned by the OS, will yield
// the number of microsecond intervals since Jan 1, year 1.
#define TICK_EPOCH_WINDOWS ((lua_Integer)0x0701ce1722770000)
#define TICK_EPOCH_UNIX ((lua_Integer)0x00dcbffeff2bc000)
#define TICKS_PER_SECOND ((lua_Integer)1000000)
int os_ticks(lua_State* L)
{
lua_Integer ticks = 0;
#if PLATFORM_WINDOWS
FILETIME fileTimeUtc;
GetSystemTimeAsFileTime(&fileTimeUtc);
ticks =
TICK_EPOCH_WINDOWS
+ ((lua_Integer)fileTimeUtc.dwHighDateTime << 32
| (lua_Integer)fileTimeUtc.dwLowDateTime);
ticks /= (lua_Integer)10;
#else
struct timeval tp;
if (gettimeofday(&tp, NULL) == 0) {
ticks =
TICK_EPOCH_UNIX
+ (lua_Integer)tp.tv_sec * TICKS_PER_SECOND
+ (lua_Integer)tp.tv_usec;
}
#endif
lua_pushinteger(L, ticks);
return 1;
}
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