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annotate include/SDL_timer.h @ 5249:762e40fb8e28

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author Sam Lantinga <slouken@libsdl.org>
date Thu, 10 Feb 2011 12:14:37 -0800
parents 481dabb098ef
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
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23 #ifndef _SDL_timer_h
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24 #define _SDL_timer_h
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25
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26 /**
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27 * \file SDL_timer.h
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28 *
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29 * Header for the SDL time management routines.
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30 */
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34
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35 #include "begin_code.h"
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36 /* Set up for C function definitions, even when using C++ */
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37 #ifdef __cplusplus
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38 /* *INDENT-OFF* */
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39 extern "C" {
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40 /* *INDENT-ON* */
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41 #endif
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42
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43 /**
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44 * \brief Get the number of milliseconds since the SDL library initialization.
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45 *
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46 * \note This value wraps if the program runs for more than ~49 days.
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47 */
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48 extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void);
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49
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50 /**
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51 * \brief Wait a specified number of milliseconds before returning.
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52 */
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53 extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
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54
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55 /**
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56 * Function prototype for the timer callback function.
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57 *
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58 * The callback function is passed the current timer interval and returns
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59 * the next timer interval. If the returned value is the same as the one
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60 * passed in, the periodic alarm continues, otherwise a new alarm is
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61 * scheduled. If the callback returns 0, the periodic alarm is cancelled.
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62 */
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63 typedef Uint32 (SDLCALL * SDL_TimerCallback) (Uint32 interval, void *param);
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64
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65 /**
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66 * Definition of the timer ID type.
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67 */
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68 typedef int SDL_TimerID;
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69
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70 /**
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71 * \brief Add a new timer to the pool of timers already running.
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72 *
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73 * \return A timer ID, or NULL when an error occurs.
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74 */
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75 extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval,
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76 SDL_TimerCallback callback,
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77 void *param);
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78
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79 /**
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80 * \brief Remove a timer knowing its ID.
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81 *
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82 * \return A boolean value indicating success or failure.
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83 *
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84 * \warning It is not safe to remove a timer multiple times.
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85 */
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86 extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t);
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87
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88
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89 /* Ends C function definitions when using C++ */
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90 #ifdef __cplusplus
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91 /* *INDENT-OFF* */
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92 }
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93 /* *INDENT-ON* */
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94 #endif
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95 #include "close_code.h"
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96
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97 #endif /* _SDL_timer_h */
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99 /* vi: set ts=4 sw=4 expandtab: */