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annotate src/timer/beos/SDL_systimer.c @ 5113:481dabb098ef

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Improved timer implementation The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms. Goals: * Minimize timer thread blocking * Dispatch timers as accurately as possible * SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe * SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
author Sam Lantinga <slouken@libsdl.org>
date Thu, 27 Jan 2011 14:45:06 -0800
parents f7b03b6838cb
children b530ef003506
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef SDL_TIMER_BEOS
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25
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26 #include <be/kernel/OS.h>
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27
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28 #include "SDL_timer.h"
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29
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30 static bigtime_t start;
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31
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32 void
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33 SDL_StartTicks(void)
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34 {
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35 /* Set first ticks value */
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36 start = system_time();
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37 }
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38
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39 Uint32
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40 SDL_GetTicks(void)
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41 {
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42 return ((system_time() - start) / 1000);
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43 }
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44
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45 void
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46 SDL_Delay(Uint32 ms)
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47 {
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48 snooze(ms * 1000);
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49 }
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50
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51 #endif /* SDL_TIMER_BEOS */
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52
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53 /* vi: set ts=4 sw=4 expandtab: */