src/timer/dummy/SDL_systimer.c
author Ryan C. Gordon
Sun, 03 Jan 2016 06:50:50 -0500
changeset 10003 d91a2c45825e
parent 9998 f67cf37e9cd4
child 10737 3406a0f8b041
permissions -rw-r--r--
Remove almost all instances of "volatile" keyword.

As Tiffany pointed out in Bugzilla, volatile is not useful for thread safety:

https://software.intel.com/en-us/blogs/2007/11/30/volatile-almost-useless-for-multi-threaded-programming/

Some of these volatiles didn't need to be, some were otherwise protected by
spinlocks or mutexes, and some got moved over to SDL_atomic_t data, etc.

Fixes Bugzilla #3220.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if defined(SDL_TIMER_DUMMY) || defined(SDL_TIMERS_DISABLED)
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#include "SDL_timer.h"
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static SDL_bool ticks_started = SDL_FALSE;
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void
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SDL_TicksInit(void)
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{
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    if (ticks_started) {
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        return;
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    }
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    ticks_started = SDL_TRUE;
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}
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void
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SDL_TicksQuit(void)
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{
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    ticks_started = SDL_FALSE;
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}
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Uint32
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SDL_GetTicks(void)
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{
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    if (!ticks_started) {
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        SDL_TicksInit();
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    }
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    SDL_Unsupported();
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    return 0;
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}
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Uint64
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SDL_GetPerformanceCounter(void)
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{
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    return SDL_GetTicks();
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}
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Uint64
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SDL_GetPerformanceFrequency(void)
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{
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    return 1000;
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}
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void
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SDL_Delay(Uint32 ms)
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{
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    SDL_Unsupported();
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}
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#endif /* SDL_TIMER_DUMMY || SDL_TIMERS_DISABLED */
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