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