Mercurial > sdl-ios-xcode
view src/timer/beos/SDL_systimer.c @ 5113:481dabb098ef
Improved timer implementation
The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms.
Goals:
* Minimize timer thread blocking
* Dispatch timers as accurately as possible
* SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe
* SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Thu, 27 Jan 2011 14:45:06 -0800 |
parents | f7b03b6838cb |
children | b530ef003506 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 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 */ #include "SDL_config.h" #ifdef SDL_TIMER_BEOS #include <be/kernel/OS.h> #include "SDL_timer.h" static bigtime_t start; void SDL_StartTicks(void) { /* Set first ticks value */ start = system_time(); } Uint32 SDL_GetTicks(void) { return ((system_time() - start) / 1000); } void SDL_Delay(Uint32 ms) { snooze(ms * 1000); } #endif /* SDL_TIMER_BEOS */ /* vi: set ts=4 sw=4 expandtab: */