include/SDL_timer.h
author Sam Lantinga <slouken@libsdl.org>
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child 3697 f7b03b6838cb
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Partial fix for bug #859 Header file update from Ken for improved doxygen output
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifndef _SDL_timer_h
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#define _SDL_timer_h
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/**
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 *  \file SDL_timer.h
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 *  
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 *  Header for the SDL time management routines.
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 */
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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 *  This is the OS scheduler timeslice, in milliseconds.
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 */
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#define SDL_TIMESLICE		10
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/**
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 *  This is the maximum resolution of the SDL timer on all platforms.
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 */
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#define TIMER_RESOLUTION	10      /**< Experimentally determined */
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/**
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 *  Get the number of milliseconds since the SDL library initialization.
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 *  
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 *  Note that this value wraps if the program runs for more than ~49 days.
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void);
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/**
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 *  Wait a specified number of milliseconds before returning.
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 */
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extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
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/**
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 *  Function prototype for the timer callback function.
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 */
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typedef Uint32(SDLCALL * SDL_TimerCallback) (Uint32 interval);
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/**
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 *  Set a callback to run after the specified number of milliseconds has
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 *  elapsed. The callback function is passed the current timer interval
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 *  and returns the next timer interval.  If the returned value is the 
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 *  same as the one passed in, the periodic alarm continues, otherwise a
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 *  new alarm is scheduled.  If the callback returns 0, the periodic alarm
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 *  is cancelled.
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 *  
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 *  To cancel a currently running timer, call 
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 *  \code SDL_SetTimer(0, NULL); \endcode
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 *  
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 *  The timer callback function may run in a different thread than your
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 *  main code, and so shouldn't call any functions from within itself.
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 *  
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 *  The maximum resolution of this timer is 10 ms, which means that if
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 *  you request a 16 ms timer, your callback will run approximately 20 ms
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 *  later on an unloaded system.  If you wanted to set a flag signaling
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 *  a frame update at 30 frames per second (every 33 ms), you might set a 
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 *  timer for 30 ms:
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 *  \code
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 *    SDL_SetTimer((33/10)*10, flag_update);
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 *  \endcode
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 *  
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 *  If you use this function, you need to pass ::SDL_INIT_TIMER to SDL_Init().
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 *  
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 *  Under UNIX, you should not use raise or use SIGALRM and this function
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 *  in the same program, as it is implemented using setitimer().  You also
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 *  should not use this function in multi-threaded applications as signals
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 *  to multi-threaded apps have undefined behavior in some implementations.
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 *  
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 *  \return 0 if successful, or -1 if there was an error.
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 */
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extern DECLSPEC int SDLCALL SDL_SetTimer(Uint32 interval,
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                                         SDL_TimerCallback callback);
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/**
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 *  \name Peter timers
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 *  New timer API, supports multiple timers
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 *  Written by Stephane Peter <megastep@lokigames.com>
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 */
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/*@{*/
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/**
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 *  Function prototype for the new timer callback function.
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 *  
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 *  The callback function is passed the current timer interval and returns
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 *  the next timer interval.  If the returned value is the same as the one
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 *  passed in, the periodic alarm continues, otherwise a new alarm is
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 *  scheduled.  If the callback returns 0, the periodic alarm is cancelled.
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 */
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typedef Uint32(SDLCALL * SDL_NewTimerCallback) (Uint32 interval, void *param);
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/**
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 *  Definition of the timer ID type.
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 */
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typedef struct _SDL_TimerID *SDL_TimerID;
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/**
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 *  Add a new timer to the pool of timers already running.
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 *  \return A timer ID, or NULL when an error occurs.
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 */
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extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval,
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                                                 SDL_NewTimerCallback
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                                                 callback, void *param);
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/**
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 *  Remove one of the multiple timers knowing its ID.
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 *  \return A boolean value indicating success or failure.
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t);
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/*@}*//*Peter timers*/
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* _SDL_timer_h */
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/* vi: set ts=4 sw=4 expandtab: */