pandory500/SDL-mirror
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Moved atomic API implementation out of headers.

Browse source 
--HG--
extra : rebase_source : 71f9b298ea312a5957cd761163f812750fb66899
This commit is contained in:
Ryan C. Gordon 2013-11-24 21:04:51 -05:00
parent 3224881c2e
commit 4b0089b843
2 changed files with 117 additions and 117 deletions
Download patch file Download diff file Expand all files Collapse all files

123
src/atomic/SDL_atomic.c
View file

@ -22,13 +22,14 @@
#include "SDL_atomic.h"
/* Note that we undefine the atomic operations here, in case they are
defined as compiler intrinsics while building SDL but the library user
doesn't have that compiler. That way we always have a working set of
atomic operations built into the library.
*/
#undef SDL_AtomicCAS
#undef SDL_AtomicCASPtr
#if defined(_MSC_VER) && (_MSC_VER >= 1500)
#include <intrin.h>
#define HAVE_MSC_ATOMICS 1
#endif
#if defined(__MACOSX__) /* !!! FIXME: should we favor gcc atomics? */
#include <libkern/OSAtomic.h>
#endif
/*
If any of the operations are not provided then we must emulate some
@ -53,6 +54,11 @@
Contributed by Bob Pendleton, bob@pendleton.com
*/
#if !defined(HAVE_MSC_ATOMICS) && !defined(HAVE_GCC_ATOMICS) && !defined(__MACOSX__)
#define EMULATE_CAS 1
#endif
#if EMULATE_CAS
static SDL_SpinLock locks[32];
static SDL_INLINE void
@ -70,10 +76,19 @@ leaveLock(void *a)
SDL_AtomicUnlock(&locks[index]);
}
#endif
DECLSPEC SDL_bool SDLCALL
SDL_bool
SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval)
{
#ifdef HAVE_MSC_ATOMICS
return (_InterlockedCompareExchange((long*)&a->value, (long)newval, (long)oldval) == (long)oldval);
#elif defined(__MACOSX__) /* !!! FIXME: should we favor gcc atomics? */
return (SDL_bool) OSAtomicCompareAndSwap32Barrier(oldval, newval, &a->value);
#elif defined(HAVE_GCC_ATOMICS)
return (SDL_bool) __sync_bool_compare_and_swap(&a->value, oldval, newval);
#elif EMULATE_CAS
SDL_bool retval = SDL_FALSE;
enterLock(a);
@ -84,11 +99,25 @@ SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval)
leaveLock(a);
return retval;
#else
#error Please define your platform.
#endif
}
DECLSPEC SDL_bool SDLCALL
SDL_bool
SDL_AtomicCASPtr(void **a, void *oldval, void *newval)
{
#if defined(HAVE_MSC_ATOMICS) && (_M_IX86)
return (_InterlockedCompareExchange((long*)a, (long)newval, (long)oldval) == (long)oldval);
#elif defined(HAVE_MSC_ATOMICS) && (!_M_IX86)
return (_InterlockedCompareExchangePointer(a, newval, oldval) == oldval);
#elif defined(__MACOSX__) && defined(__LP64__) /* !!! FIXME: should we favor gcc atomics? */
return (SDL_bool) OSAtomicCompareAndSwap64Barrier((int64_t)oldval, (int64_t)newval, (int64_t*) a);
#elif defined(__MACOSX__) && !defined(__LP64__) /* !!! FIXME: should we favor gcc atomics? */
return (SDL_bool) OSAtomicCompareAndSwap32Barrier((int32_t)oldval, (int32_t)newval, (int32_t*) a);
#elif defined(HAVE_GCC_ATOMICS)
return __sync_bool_compare_and_swap(a, oldval, newval);
#elif EMULATE_CAS
SDL_bool retval = SDL_FALSE;
enterLock(a);
@ -99,10 +128,80 @@ SDL_AtomicCASPtr(void **a, void *oldval, void *newval)
leaveLock(a);
return retval;
#else
#error Please define your platform.
#endif
}
#if defined(__GNUC__) && defined(__arm__) && \
(defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__))
int
SDL_AtomicSet(SDL_atomic_t *a, int v)
{
#ifdef HAVE_MSC_ATOMICS
return _InterlockedExchange((long*)&a->value, v);
#elif defined(HAVE_GCC_ATOMICS)
return __sync_lock_test_and_set(&a->value, v);
#else
int value;
do {
value = a->value;
} while (!SDL_AtomicCAS(a, value, v));
return value;
#endif
}
void*
SDL_AtomicSetPtr(void **a, void *v)
{
#ifdef HAVE_MSC_ATOMICS
return _InterlockedExchangePointer(a, v);
#elif defined(HAVE_GCC_ATOMICS)
return __sync_lock_test_and_set(a, v);
#else
void *value;
do {
value = *a;
} while (!SDL_AtomicCASPtr(a, value, v));
return value;
#endif
}
int
SDL_AtomicAdd(SDL_atomic_t *a, int v)
{
#ifdef HAVE_MSC_ATOMICS
return _InterlockedExchangeAdd((long*)&a->value, v);
#elif defined(HAVE_GCC_ATOMICS)
return __sync_fetch_and_add(&a->value, v);
#else
int value;
do {
value = a->value;
} while (!SDL_AtomicCAS(a, value, (value + v)));
return value;
#endif
}
int
SDL_AtomicGet(SDL_atomic_t *a)
{
int value;
do {
value = a->value;
} while (!SDL_AtomicCAS(a, value, value));
return value;
}
void *
SDL_AtomicGetPtr(void **a)
{
void *value;
do {
value = *a;
} while (!SDL_AtomicCASPtr(a, value, value));
return value;
}
#ifdef __thumb__
__asm__(
" .align 2\n"
" .globl _SDL_MemoryBarrierRelease\n"
@ -113,6 +212,6 @@ __asm__(
" mcr p15, 0, r0, c7, c10, 5\n"
" bx lr\n"
);
#endif /* __GNUC__ && __arm__ && ARMV6 */
#endif
/* vi: set ts=4 sw=4 expandtab: */