| author | Sam Lantinga <slouken@libsdl.org> |
| Mon, 19 Oct 2009 13:31:58 +0000 | |
| changeset 3407 | d3baf5ac4e37 |
| parent 3261 | 72b542f34739 |
| child 3697 | f7b03b6838cb |
| 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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Contributed by Bob Pendleton, bob@pendleton.com |
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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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* 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. |
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* |
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* At the very minimum spin locks must be implemented. Without spin |
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* locks it is not possible (AFAICT) to emulate the rest of the atomic |
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* 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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/* Function prototypes */ |
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/** |
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* \name SDL AtomicLock |
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* |
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* The spin lock functions and type are required and can not be |
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* emulated because they are used in the emulation code. |
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*/ |
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/*@{*/
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typedef volatile Uint32 SDL_SpinLock; |
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/** |
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* \brief Lock a spin lock by setting it to a none zero value. |
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* |
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* \param lock Points to the lock. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock); |
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/** |
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* \brief Unlock a spin lock by setting it to 0. Always returns immediately |
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* |
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* \param lock Points to the lock. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock); |
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/*@}*//*SDL AtomicLock*/ |
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/** |
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* \name 32 bit atomic operations |
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*/ |
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/*@{*/
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/** |
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* \brief Check to see if \c *ptr == 0 and set it to 1. |
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* |
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* \return SDL_True if the value pointed to by \c 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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extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr); |
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/** |
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* \brief Set the value pointed to by \c 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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extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr); |
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/** |
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* \brief Fetch the current value of \c *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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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr); |
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/** |
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* \brief Fetch \c *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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extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr); |
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/** |
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* \brief Fetch the current value at \c ptr and then add \c value to \c *ptr. |
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* |
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* \return \c *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 \c *ptr. |
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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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* \brief Fetch \c *ptr and then subtract \c value from it. |
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* |
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* \return \c *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 \c *ptr. |
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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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* \brief Add one to the data pointed to by \c 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 The address of the data to increment. |
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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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* \brief Subtract one from data pointed to by \c 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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extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr); |
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/** |
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* \brief Add \c value to the data pointed to by \c ptr and return result. |
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* |
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* \return The sum of \c *ptr and \c 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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extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value); |
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/** |
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* \brief Subtract \c value from the data pointed to by \c ptr and return the result. |
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* |
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* \return The difference between \c *ptr and \c 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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extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value); |
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/*@}*//*32 bit atomic operations*/ |
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184 |
|
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/** |
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* \name 64 bit atomic operations |
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*/ |
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/*@{*/
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#ifdef SDL_HAS_64BIT_TYPE |
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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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/*@}*//*64 bit atomic operations*/ |
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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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208 |
} |
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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: */ |