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annotate include/SDL_timer.h @ 2213:59a667370c57
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| author | Bob Pendleton <bob@pendleton.com> |
|---|---|
| date | Tue, 24 Jul 2007 18:46:45 +0000 |
| parents | c121d94672cb |
| children | 99210400e8b9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifndef _SDL_timer_h | |
| 24 #define _SDL_timer_h | |
| 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 */ |
| 0 | 31 |
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32 #include "SDL_stdinc.h" |
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33 #include "SDL_error.h" |
| 0 | 34 |
| 35 #include "begin_code.h" | |
| 36 /* Set up for C function definitions, even when using C++ */ | |
| 37 #ifdef __cplusplus | |
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38 /* *INDENT-OFF* */ |
| 0 | 39 extern "C" { |
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40 /* *INDENT-ON* */ |
| 0 | 41 #endif |
| 42 | |
| 43 /* This is the OS scheduler timeslice, in milliseconds */ | |
| 44 #define SDL_TIMESLICE 10 | |
| 45 | |
| 46 /* This is the maximum resolution of the SDL timer on all platforms */ | |
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47 #define TIMER_RESOLUTION 10 /* Experimentally determined */ |
| 0 | 48 |
| 49 /* Get the number of milliseconds since the SDL library initialization. | |
| 50 * Note that this value wraps if the program runs for more than ~49 days. | |
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51 */ |
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52 extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void); |
| 0 | 53 |
| 54 /* Wait a specified number of milliseconds before returning */ | |
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55 extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms); |
| 0 | 56 |
| 57 /* Function prototype for the timer callback function */ | |
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58 typedef Uint32(SDLCALL * SDL_TimerCallback) (Uint32 interval); |
| 0 | 59 |
| 60 /* Set a callback to run after the specified number of milliseconds has | |
| 61 * elapsed. The callback function is passed the current timer interval | |
| 62 * and returns the next timer interval. If the returned value is the | |
| 63 * same as the one passed in, the periodic alarm continues, otherwise a | |
| 64 * new alarm is scheduled. If the callback returns 0, the periodic alarm | |
| 65 * is cancelled. | |
| 66 * | |
| 67 * To cancel a currently running timer, call SDL_SetTimer(0, NULL); | |
| 68 * | |
| 69 * The timer callback function may run in a different thread than your | |
| 70 * main code, and so shouldn't call any functions from within itself. | |
| 71 * | |
| 72 * The maximum resolution of this timer is 10 ms, which means that if | |
| 73 * you request a 16 ms timer, your callback will run approximately 20 ms | |
| 74 * later on an unloaded system. If you wanted to set a flag signaling | |
| 75 * a frame update at 30 frames per second (every 33 ms), you might set a | |
| 76 * timer for 30 ms: | |
| 77 * SDL_SetTimer((33/10)*10, flag_update); | |
| 78 * | |
| 79 * If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init(). | |
| 80 * | |
| 81 * Under UNIX, you should not use raise or use SIGALRM and this function | |
| 82 * in the same program, as it is implemented using setitimer(). You also | |
| 83 * should not use this function in multi-threaded applications as signals | |
| 84 * to multi-threaded apps have undefined behavior in some implementations. | |
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85 * |
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86 * This function returns 0 if successful, or -1 if there was an error. |
| 0 | 87 */ |
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88 extern DECLSPEC int SDLCALL SDL_SetTimer(Uint32 interval, |
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89 SDL_TimerCallback callback); |
| 0 | 90 |
| 91 /* New timer API, supports multiple timers | |
| 92 * Written by Stephane Peter <megastep@lokigames.com> | |
| 93 */ | |
| 94 | |
| 95 /* Function prototype for the new timer callback function. | |
| 96 * The callback function is passed the current timer interval and returns | |
| 97 * the next timer interval. If the returned value is the same as the one | |
| 98 * passed in, the periodic alarm continues, otherwise a new alarm is | |
| 99 * scheduled. If the callback returns 0, the periodic alarm is cancelled. | |
| 100 */ | |
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101 typedef Uint32(SDLCALL * SDL_NewTimerCallback) (Uint32 interval, void *param); |
| 0 | 102 |
| 103 /* Definition of the timer ID type */ | |
| 104 typedef struct _SDL_TimerID *SDL_TimerID; | |
| 105 | |
| 106 /* Add a new timer to the pool of timers already running. | |
| 107 Returns a timer ID, or NULL when an error occurs. | |
| 108 */ | |
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109 extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval, |
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110 SDL_NewTimerCallback |
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111 callback, void *param); |
| 0 | 112 |
| 113 /* Remove one of the multiple timers knowing its ID. | |
| 114 * Returns a boolean value indicating success. | |
| 115 */ | |
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116 extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t); |
| 0 | 117 |
| 118 /* Ends C function definitions when using C++ */ | |
| 119 #ifdef __cplusplus | |
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120 /* *INDENT-OFF* */ |
| 0 | 121 } |
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122 /* *INDENT-ON* */ |
| 0 | 123 #endif |
| 124 #include "close_code.h" | |
| 125 | |
| 126 #endif /* _SDL_timer_h */ | |
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127 |
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128 /* vi: set ts=4 sw=4 expandtab: */ |