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SDL_atomic.h
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SDL_atomic.h
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 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
*/
/**
* \file SDL_atomic.h
*
* Atomic operations.
*/
#ifndef _SDL_atomic_h_
#define _SDL_atomic_h_
#include "SDL_stdinc.h"
#include "SDL_platform.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif
/**
* These operations may, or may not, actually be implemented using
* processor specific atomic operations. When possible they are
* implemented as true processor specific atomic operations. When that
* is not possible the are implemented using locks that *do* use the
* available atomic operations. In rare cases they may be implemented
* using SDL's mutex fuctions.
*/
/* Function prototypes */
/* 8 bit atomic operations */
extern DECLSPEC Uint8 SDLCALL SDL_AtomicExchange8(volatile Uint8 * ptr, Uint8 value);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet8(volatile Uint8 * ptr,
Uint8 oldvalue, Uint8 newvalue);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet8(volatile Uint8 * ptr);
extern DECLSPEC void SDLCALL SDL_AtomicClear8(volatile Uint8 * ptr);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenIncrement8(volatile Uint8 * ptr);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenDecrement8(volatile Uint8 * ptr);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenAdd8(volatile Uint8 * ptr, Uint8 value);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenSubtract8(volatile Uint8 * ptr, Uint8 value);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicIncrementThenFetch8(volatile Uint8 * ptr);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicDecrementThenFetch8(volatile Uint8 * ptr);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicAddThenFetch8(volatile Uint8 * ptr, Uint8 value);
extern DECLSPEC Uint8 SDLCALL SDL_AtomicSubtractThenFetch8(volatile Uint8 * ptr, Uint8 value);
/* 16 bit atomic operations */
extern DECLSPEC Uint16 SDLCALL SDL_AtomicExchange16(volatile Uint16 * ptr, Uint16 value);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet16(volatile Uint16 * ptr,
Uint16 oldvalue, Uint16 newvalue);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet16(volatile Uint16 * ptr);
extern DECLSPEC void SDLCALL SDL_AtomicClear16(volatile Uint16 * ptr);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenIncrement16(volatile Uint16 * ptr);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenDecrement16(volatile Uint16 * ptr);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenAdd16(volatile Uint16 * ptr, Uint16 value);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenSubtract16(volatile Uint16 * ptr, Uint16 value);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicIncrementThenFetch16(volatile Uint16 * ptr);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicDecrementThenFetch16(volatile Uint16 * ptr);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicAddThenFetch16(volatile Uint16 * ptr, Uint16 value);
extern DECLSPEC Uint16 SDLCALL SDL_AtomicSubtractThenFetch16(volatile Uint16 * ptr, Uint16 value);
/* 32 bit atomic operations */
/**
* \fn int SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value)
*
* \brief Atomically exchange two 32 bit values.
*
* \return the value point to by ptr.
*
* \param ptr points to the value to be fetched from *ptr.
* \param value is value to be stored at *ptr.
*
* The current value stored at *ptr is returned and it is replaced
* with value. This function can be used to implement SDL_TestThenSet.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value);
/**
* \fn int SDL_AtomicCompareThenSet32(volatile Uint32 * ptr, Uint32 oldvalue, Uint32 newvalue)
*
* \brief If *ptr == oldvalue then replace the contents of *ptr by new value.
*
* \return true if the newvalue was stored.
*
* \param *ptr is the value to be compared and replaced.
* \param oldvalue is value to be compared to *ptr.
* \param newvalue is value to be stored at *ptr.
*
*/
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet32(volatile Uint32 * ptr,
Uint32 oldvalue, Uint32 newvalue);
/**
* \fn SDL_bool SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
*
* \brief Check to see if *ptr == 0 and set it to non-zero.
*
* \return SDL_True if the value pointed to by ptr was zero and
* SDL_False if it was not zero
*
* \param ptr points to the value to be tested and set.
*
*/
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
/**
* \fn void SDL_AtomicClear32(volatile Uint32 * ptr);
*
* \brief set the value pointed to by ptr to be zero.
*
* \param ptr address of the value to be set to zero
*
*/
extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr);
/**
* \fn Uint32 SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
*
* \brief fetch the current value of *ptr and then increment that
* value in place.
*
* \return the value before it was incremented.
*
* \param ptr address of the value to fetch and increment
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
/**
* \fn Uint32 SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
*
* \brief fetch *ptr and then decrement the value in place.
*
* \return the value before it was decremented.
*
* \param ptr address of the value to fetch and drement
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
/**
* \fn Uint32 SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
*
* \brief fetch the current value at ptr and then add value to *ptr.
*
* \return *ptr before the addition took place.
*
* \param ptr the address of data we are changing.
* \param value the value to add to *ptr.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
/**
* \fn Uint32 SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
*
* \brief Fetch *ptr and then subtract value from it.
*
* \return *ptr before the subtraction took place.
*
* \param ptr the address of the data being changed.
* \param value the value to subtract from *ptr.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
/**
* \fn Uint32 SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
*
* \brief Add one to the data pointed to by ptr and return that value.
*
* \return the incremented value.
*
* \param ptr address of the data to increment.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
/**
* \fn Uint32 SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
*
* \brief Subtract one from data pointed to by ptr and return the new value.
*
* \return The decremented value.
*
* \param ptr The address of the data to decrement.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
/**
* \fn Uint32 SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
*
* \brief Add value to the data pointed to by ptr and return result.
*
* \return The sum of *ptr and value.
*
* \param ptr The address of the data to be modified.
* \param value The value to be added.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
/**
* \fn Uint32 SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
*
* \brief Subtract value from the data pointed to by ptr and return the result.
*
* \return the difference between *ptr and value.
*
* \param ptr The address of the data to be modified.
* \param value The value to be subtracted.
*
*/
extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
/* 64 bit atomic operations */
#ifdef SDL_HAS_64BIT_TYPE
extern DECLSPEC Uint64 SDLCALL SDL_AtomicExchange64(volatile Uint64 * ptr, Uint64 value);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet64(volatile Uint64 * ptr,
Uint64 oldvalue, Uint64 newvalue);
extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
#endif /* SDL_HAS_64BIT_TYPE */
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_atomic_h_ */
/* vi: set ts=4 sw=4 expandtab: */