include/SDL_atomic.h
author Bob Pendleton <bob@pendleton.com>
Tue, 11 Aug 2009 21:27:19 +0000
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child 3261 72b542f34739
permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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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/**
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 * \file SDL_atomic.h
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 *
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 * Atomic operations.
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 */
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#ifndef _SDL_atomic_h_
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#define _SDL_atomic_h_
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#include "SDL_stdinc.h"
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#include "SDL_platform.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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 * These operations may, or may not, actually be implemented using
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 * processor specific atomic operations. When possible they are
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 * implemented as true processor specific atomic operations. When that
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 * is not possible the are implemented using locks that *do* use the
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 * available atomic operations. In rare cases they may be implemented
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 * using SDL's mutex fuctions.
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 */
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/* Function prototypes */
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/* 32 bit atomic operations */
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/**
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 * \fn int SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value)
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 *
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 * \brief Atomically exchange two 32 bit values.
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 *
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 * \return the value point to by ptr.
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 *
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 * \param ptr points to the value to be fetched from *ptr.  
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 * \param value is value to be stored at *ptr.
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 *
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 * The current value stored at *ptr is returned and it is replaced
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 * with value. This function can be used to implement SDL_TestThenSet.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value);
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/**
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 * \fn int SDL_AtomicCompareThenSet32(volatile Uint32 * ptr, Uint32 oldvalue, Uint32 newvalue)
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 *
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 * \brief If *ptr == oldvalue then replace the contents of *ptr by new value. 
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 *
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 * \return true if the newvalue was stored.
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 *
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 * \param *ptr is the value to be compared and replaced.
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 * \param oldvalue is value to be compared to *ptr.
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 * \param newvalue is value to be stored at *ptr.
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 *
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet32(volatile Uint32 * ptr,
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                                                            Uint32 oldvalue, Uint32 newvalue);
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/**
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 * \fn  SDL_bool SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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 *
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 * \brief Check to see if *ptr == 0 and set it to non-zero.
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 *
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 * \return SDL_True if the value pointed to by ptr was zero and
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 * SDL_False if it was not zero
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 *
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 * \param ptr points to the value to be tested and set.
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 *
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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/**
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 * \fn  void SDL_AtomicClear32(volatile Uint32 * ptr);
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 *
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 * \brief set the value pointed to by ptr to be zero.
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 *
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 * \param ptr address of the value to be set to zero
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 *
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 */
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extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr);
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/**
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 * \fn  Uint32 SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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 *
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 * \brief fetch the current value of *ptr and then increment that
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 * value in place.
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 *
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 * \return the value before it was incremented.
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 *
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 * \param ptr address of the value to fetch and increment
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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/**
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 * \fn  Uint32 SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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 * \brief fetch *ptr and then decrement the value in place.
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 *
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 * \return the value before it was decremented.
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 *
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 * \param ptr address of the value to fetch and drement
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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/**
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 * \fn  Uint32 SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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 *
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 * \brief fetch the current value at ptr and then add value to *ptr.
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 *
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 * \return *ptr before the addition took place.
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 *
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 * \param ptr the address of data we are changing.
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 * \param value the value to add to *ptr. 
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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/**
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 * \fn  Uint32 SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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 *
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 * \brief Fetch *ptr and then subtract value from it.
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 *
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 * \return *ptr before the subtraction took place.
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 *
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 * \param ptr the address of the data being changed.
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 * \param value the value to subtract from *ptr.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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/**
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 * \fn  Uint32 SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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 *
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 * \brief Add one to the data pointed to by ptr and return that value.
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 *
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 * \return the incremented value.
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 *
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 * \param ptr address of the data to increment.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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/**
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 * \fn  Uint32 SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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 *
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 * \brief Subtract one from data pointed to by ptr and return the new value.
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 *
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 * \return The decremented value.
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 *
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 * \param ptr The address of the data to decrement.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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/**
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 * \fn  Uint32 SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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 *
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 * \brief Add value to the data pointed to by ptr and return result.
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 *
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 * \return The sum of *ptr and value.
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 *
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 * \param ptr The address of the data to be modified.
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 * \param value The value to be added.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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/**
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 * \fn  Uint32 SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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 *
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 * \brief Subtract value from the data pointed to by ptr and return the result.
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 *
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 * \return the difference between *ptr and value.
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 *
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 * \param ptr The address of the data to be modified.
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 * \param value The value to be subtracted.
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 *
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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/* 64 bit atomic operations */
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#ifdef SDL_HAS_64BIT_TYPE
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicExchange64(volatile Uint64 * ptr, Uint64 value);
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extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet64(volatile Uint64 * ptr,
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                                                            Uint64 oldvalue, Uint64 newvalue);
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extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
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extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
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extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
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#endif /*  SDL_HAS_64BIT_TYPE */
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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_atomic_h_ */
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/* vi: set ts=4 sw=4 expandtab: */