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annotate include/SDL_timer.h @ 419:3d8ad40ef561
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 20 Jun 2002 17:47:18 +0000 |
| parents | 9154ec9ca3d2 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef _SDL_timer_h | |
| 29 #define _SDL_timer_h | |
| 30 | |
| 31 /* Header for the SDL time management routines */ | |
| 32 | |
| 33 #include "SDL_main.h" | |
| 34 #include "SDL_types.h" | |
| 35 | |
| 36 #include "begin_code.h" | |
| 37 /* Set up for C function definitions, even when using C++ */ | |
| 38 #ifdef __cplusplus | |
| 39 extern "C" { | |
| 40 #endif | |
| 41 | |
| 42 /* This is the OS scheduler timeslice, in milliseconds */ | |
| 43 #define SDL_TIMESLICE 10 | |
| 44 | |
| 45 /* This is the maximum resolution of the SDL timer on all platforms */ | |
| 46 #define TIMER_RESOLUTION 10 /* Experimentally determined */ | |
| 47 | |
| 48 /* Get the number of milliseconds since the SDL library initialization. | |
| 49 * Note that this value wraps if the program runs for more than ~49 days. | |
| 50 */ | |
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51 extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void); |
| 0 | 52 |
| 53 /* Wait a specified number of milliseconds before returning */ | |
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54 extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms); |
| 0 | 55 |
| 56 /* Function prototype for the timer callback function */ | |
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57 typedef Uint32 (SDLCALL *SDL_TimerCallback)(Uint32 interval); |
| 0 | 58 |
| 59 /* Set a callback to run after the specified number of milliseconds has | |
| 60 * elapsed. The callback function is passed the current timer interval | |
| 61 * and returns the next timer interval. If the returned value is the | |
| 62 * same as the one passed in, the periodic alarm continues, otherwise a | |
| 63 * new alarm is scheduled. If the callback returns 0, the periodic alarm | |
| 64 * is cancelled. | |
| 65 * | |
| 66 * To cancel a currently running timer, call SDL_SetTimer(0, NULL); | |
| 67 * | |
| 68 * The timer callback function may run in a different thread than your | |
| 69 * main code, and so shouldn't call any functions from within itself. | |
| 70 * | |
| 71 * The maximum resolution of this timer is 10 ms, which means that if | |
| 72 * you request a 16 ms timer, your callback will run approximately 20 ms | |
| 73 * later on an unloaded system. If you wanted to set a flag signaling | |
| 74 * a frame update at 30 frames per second (every 33 ms), you might set a | |
| 75 * timer for 30 ms: | |
| 76 * SDL_SetTimer((33/10)*10, flag_update); | |
| 77 * | |
| 78 * If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init(). | |
| 79 * | |
| 80 * Under UNIX, you should not use raise or use SIGALRM and this function | |
| 81 * in the same program, as it is implemented using setitimer(). You also | |
| 82 * should not use this function in multi-threaded applications as signals | |
| 83 * to multi-threaded apps have undefined behavior in some implementations. | |
| 84 */ | |
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85 extern DECLSPEC int SDLCALL SDL_SetTimer(Uint32 interval, SDL_TimerCallback callback); |
| 0 | 86 |
| 87 /* New timer API, supports multiple timers | |
| 88 * Written by Stephane Peter <megastep@lokigames.com> | |
| 89 */ | |
| 90 | |
| 91 /* Function prototype for the new timer callback function. | |
| 92 * The callback function is passed the current timer interval and returns | |
| 93 * the next timer interval. If the returned value is the same as the one | |
| 94 * passed in, the periodic alarm continues, otherwise a new alarm is | |
| 95 * scheduled. If the callback returns 0, the periodic alarm is cancelled. | |
| 96 */ | |
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97 typedef Uint32 (SDLCALL *SDL_NewTimerCallback)(Uint32 interval, void *param); |
| 0 | 98 |
| 99 /* Definition of the timer ID type */ | |
| 100 typedef struct _SDL_TimerID *SDL_TimerID; | |
| 101 | |
| 102 /* Add a new timer to the pool of timers already running. | |
| 103 Returns a timer ID, or NULL when an error occurs. | |
| 104 */ | |
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105 extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param); |
| 0 | 106 |
| 107 /* Remove one of the multiple timers knowing its ID. | |
| 108 * Returns a boolean value indicating success. | |
| 109 */ | |
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110 extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t); |
| 0 | 111 |
| 112 /* Ends C function definitions when using C++ */ | |
| 113 #ifdef __cplusplus | |
| 114 } | |
| 115 #endif | |
| 116 #include "close_code.h" | |
| 117 | |
| 118 #endif /* _SDL_timer_h */ |