4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
33 * \brief Portable abstraction for high-resolution time handling (implementation)
35 * \author Bernie Innocenti <bernie@codewiz.org>
44 hptime_t hptime_get(void)
49 * La precisione dei FileTime sarebbe 100ns, ma il
50 * valore viene ottenuto convertendo una struttura
51 * SYSTEMTIME, che ha precisione di 1ms. Il numero
52 * che otteniamo e' quindi sempre un multiplo di
55 GetSystemTimeAsFileTime(&ft);
57 /* Copy the upper/lower into a quadword. */
58 return (((hptime_t)ft.dwHighDateTime) << 32) + (hptime_t)ft.dwLowDateTime;
61 #elif defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
63 #include <sys/time.h> /* for gettimeofday() */
64 #include <stddef.h> /* for NULL */
66 hptime_t hptime_get(void)
70 gettimeofday(&tv, NULL);
71 return (hptime_t)tv.tv_sec * HPTIME_TICKS_PER_SECOND
72 + (hptime_t)tv.tv_usec;
76 #error OS dependent support code missing for this OS
77 #endif /* !__unix__ */