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Commit e38cbfcc authored by Sam Lantinga's avatar Sam Lantinga
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Removed the atomic file for the old API

parent 96656bb9
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Makefile.ds
View file @ e38cbfcc
......@@ -39,7 +39,6 @@ src/SDL_error.c \
src/SDL_fatal.c \
src/SDL_hints.c \
src/SDL_log.c \
src/atomic/nds/SDL_atomic.c \
src/atomic/SDL_atomic.c \
src/audio/SDL_audio.c \
src/audio/SDL_audiocvt.c \
......
src/atomic/nds/SDL_atomic.c deleted 100644 → 0
View file @ 96656bb9
/*
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
Contributed by Bob Pendleton, bob@pendleton.com
*/
#include "SDL_stdinc.h"
#include "SDL_atomic.h"
#include "SDL_error.h"
/*
This file provides 32, and 64 bit atomic operations. If the
operations are provided by the native hardware and operating system
they are used. If they are not then the operations are emulated
using the SDL spin lock operations. If spin lock can not be
implemented then these functions must fail.
*/
/*
DUMMY VERSION.
This version of the code assumes there is no support for atomic
operations. Therefore, every function sets the SDL error
message. Oddly enough, if you only have one thread then this
version actuallys works.
*/
/*
Native spinlock routines. Because this is the dummy implementation
these will always call SDL_SetError() and do nothing.
*/
void
SDL_AtomicLock(SDL_SpinLock *lock)
{
SDL_SetError("SDL_atomic.c: is not implemented on this platform");
}
void
SDL_AtomicUnlock(SDL_SpinLock *lock)
{
SDL_SetError("SDL_atomic.c: is not implemented on this platform");
}
/*
Note that platform specific versions can be built from this version
by changing the #undefs to #defines and adding platform specific
code.
*/
#undef nativeTestThenSet32
#undef nativeClear32
#undef nativeFetchThenIncrement32
#undef nativeFetchThenDecrement32
#undef nativeFetchThenAdd32
#undef nativeFetchThenSubtract32
#undef nativeIncrementThenFetch32
#undef nativeDecrementThenFetch32
#undef nativeAddThenFetch32
#undef nativeSubtractThenFetch32
#undef nativeTestThenSet64
#undef nativeClear64
#undef nativeFetchThenIncrement64
#undef nativeFetchThenDecrement64
#undef nativeFetchThenAdd64
#undef nativeFetchThenSubtract64
#undef nativeIncrementThenFetch64
#undef nativeDecrementThenFetch64
#undef nativeAddThenFetch64
#undef nativeSubtractThenFetch64
/*
If any of the operations are not provided then we must emulate some
of them. That means we need a nice implementation of spin locks
that avoids the "one big lock" problem. We use a vector of spin
locks and pick which one to use based on the address of the operand
of the function.
To generate the index of the lock we first shift by 3 bits to get
rid on the zero bits that result from 32 and 64 bit allignment of
data. We then mask off all but 5 bits and use those 5 bits as an
index into the table.
Picking the lock this way insures that accesses to the same data at
the same time will go to the same lock. OTOH, accesses to different
data have only a 1/32 chance of hitting the same lock. That should
pretty much eliminate the chances of several atomic operations on
different data from waiting on the same "big lock". If it isn't
then the table of locks can be expanded to a new size so long as
the new size is a power of two.
*/
static SDL_SpinLock locks[32] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
static __inline__ void
privateWaitLock(volatile void *ptr)
{
#if SIZEOF_VOIDP == 4
Uint32 index = ((((Uint32)ptr) >> 3) & 0x1f);
#elif SIZEOF_VOIDP == 8
Uint64 index = ((((Uint64)ptr) >> 3) & 0x1f);
#endif
SDL_AtomicLock(&locks[index]);
}
static __inline__ void
privateUnlock(volatile void *ptr)
{
#if SIZEOF_VOIDP == 4
Uint32 index = ((((Uint32)ptr) >> 3) & 0x1f);
#elif SIZEOF_VOIDP == 8
Uint64 index = ((((Uint64)ptr) >> 3) & 0x1f);
#endif
SDL_AtomicUnlock(&locks[index]);
}
/* 32 bit atomic operations */
SDL_bool
SDL_AtomicTestThenSet32(volatile Uint32 * ptr)
{
#ifdef nativeTestThenSet32
#else
SDL_bool result = SDL_FALSE;
privateWaitLock(ptr);
result = (*ptr == 0);
if (result)
{
*ptr = 1;
}
privateUnlock(ptr);
return result;
#endif
}
void
SDL_AtomicClear32(volatile Uint32 * ptr)
{
#ifdef nativeClear32
#else
privateWaitLock(ptr);
*ptr = 0;
privateUnlock(ptr);
return;
#endif
}
Uint32
SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr)
{
#ifdef nativeFetchThenIncrement32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)+= 1;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr)
{
#ifdef nativeFetchThenDecrement32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr) -= 1;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value)
{
#ifdef nativeFetchThenAdd32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)+= value;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value)
{
#ifdef nativeFetchThenSubtract32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)-= value;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr)
{
#ifdef nativeIncrementThenFetch32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
(*ptr)+= 1;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr)
{
#ifdef nativeDecrementThenFetch32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
(*ptr)-= 1;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value)
{
#ifdef nativeAddThenFetch32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
(*ptr)+= value;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint32
SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value)
{
#ifdef nativeSubtractThenFetch32
#else
Uint32 tmp = 0;
privateWaitLock(ptr);
(*ptr)-= value;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
/* 64 bit atomic operations */
#ifdef SDL_HAS_64BIT_TYPE
SDL_bool
SDL_AtomicTestThenSet64(volatile Uint64 * ptr)
{
#ifdef nativeTestThenSet64
#else
SDL_bool result = SDL_FALSE;
privateWaitLock(ptr);
result = (*ptr == 0);
if (result)
{
*ptr = 1;
}
privateUnlock(ptr);
return result;
#endif
}
void
SDL_AtomicClear64(volatile Uint64 * ptr)
{
#ifdef nativeClear64
#else
privateWaitLock(ptr);
*ptr = 0;
privateUnlock(ptr);
return;
#endif
}
Uint64
SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr)
{
#ifdef nativeFetchThenIncrement64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)+= 1;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr)
{
#ifdef nativeFetchThenDecrement64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr) -= 1;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value)
{
#ifdef nativeFetchThenAdd64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)+= value;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value)
{
#ifdef nativeFetchThenSubtract64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
tmp = *ptr;
(*ptr)-= value;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr)
{
#ifdef nativeIncrementThenFetch64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
(*ptr)+= 1;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr)
{
#ifdef nativeDecrementThenFetch64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
(*ptr)-= 1;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value)
{
#ifdef nativeAddThenFetch64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
(*ptr)+= value;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
Uint64
SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value)
{
#ifdef nativeSubtractThenFetch64
#else
Uint64 tmp = 0;
privateWaitLock(ptr);
(*ptr)-= value;
tmp = *ptr;
privateUnlock(ptr);
return tmp;
#endif
}
#endif
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