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annotate include/SDL_timer.h @ 3694:b0a707f589a6

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Fixed bug #916 Shutting down the video shuts down the event loop, so don't do that after starting the event loop. :)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Jan 2010 19:47:17 +0000
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children f7b03b6838cb
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 * This is the OS scheduler timeslice, in milliseconds.
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45 */
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46 #define SDL_TIMESLICE 10
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47
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48 /**
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49 * This is the maximum resolution of the SDL timer on all platforms.
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50 */
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51 #define TIMER_RESOLUTION 10 /**< Experimentally determined */
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52
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53 /**
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54 * Get the number of milliseconds since the SDL library initialization.
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55 *
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56 * Note that this value wraps if the program runs for more than ~49 days.
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57 */
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58 extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void);
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59
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60 /**
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61 * Wait a specified number of milliseconds before returning.
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62 */
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63 extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
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64
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65 /**
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66 * Function prototype for the timer callback function.
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67 */
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68 typedef Uint32(SDLCALL * SDL_TimerCallback) (Uint32 interval);
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69
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70 /**
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71 * Set a callback to run after the specified number of milliseconds has
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72 * elapsed. The callback function is passed the current timer interval
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73 * and returns the next timer interval. If the returned value is the
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74 * same as the one passed in, the periodic alarm continues, otherwise a
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75 * new alarm is scheduled. If the callback returns 0, the periodic alarm
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76 * is cancelled.
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77 *
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78 * To cancel a currently running timer, call
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79 * \code SDL_SetTimer(0, NULL); \endcode
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80 *
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81 * The timer callback function may run in a different thread than your
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82 * main code, and so shouldn't call any functions from within itself.
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83 *
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84 * The maximum resolution of this timer is 10 ms, which means that if
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85 * you request a 16 ms timer, your callback will run approximately 20 ms
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86 * later on an unloaded system. If you wanted to set a flag signaling
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87 * a frame update at 30 frames per second (every 33 ms), you might set a
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88 * timer for 30 ms:
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89 * \code
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90 * SDL_SetTimer((33/10)*10, flag_update);
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91 * \endcode
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92 *
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93 * If you use this function, you need to pass ::SDL_INIT_TIMER to SDL_Init().
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94 *
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95 * Under UNIX, you should not use raise or use SIGALRM and this function
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96 * in the same program, as it is implemented using setitimer(). You also
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97 * should not use this function in multi-threaded applications as signals
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98 * to multi-threaded apps have undefined behavior in some implementations.
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99 *
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100 * \return 0 if successful, or -1 if there was an error.
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101 */
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102 extern DECLSPEC int SDLCALL SDL_SetTimer(Uint32 interval,
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103 SDL_TimerCallback callback);
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104
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105 /**
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106 * \name Peter timers
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107 * New timer API, supports multiple timers
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108 * Written by Stephane Peter <megastep@lokigames.com>
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109 */
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110 /*@{*/
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111
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112 /**
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113 * Function prototype for the new timer callback function.
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114 *
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115 * The callback function is passed the current timer interval and returns
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116 * the next timer interval. If the returned value is the same as the one
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117 * passed in, the periodic alarm continues, otherwise a new alarm is
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118 * scheduled. If the callback returns 0, the periodic alarm is cancelled.
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119 */
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120 typedef Uint32(SDLCALL * SDL_NewTimerCallback) (Uint32 interval, void *param);
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121
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122 /**
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123 * Definition of the timer ID type.
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124 */
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125 typedef struct _SDL_TimerID *SDL_TimerID;
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126
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127 /**
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128 * Add a new timer to the pool of timers already running.
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129 * \return A timer ID, or NULL when an error occurs.
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130 */
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131 extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval,
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132 SDL_NewTimerCallback
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133 callback, void *param);
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134
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135 /**
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136 * Remove one of the multiple timers knowing its ID.
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137 * \return A boolean value indicating success or failure.
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138 */
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139 extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t);
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140
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141 /*@}*//*Peter timers*/
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142
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143 /* Ends C function definitions when using C++ */
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144 #ifdef __cplusplus
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145 /* *INDENT-OFF* */
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146 }
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147 /* *INDENT-ON* */
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148 #endif
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149 #include "close_code.h"
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150
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151 #endif /* _SDL_timer_h */
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153 /* vi: set ts=4 sw=4 expandtab: */