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Diffstat (limited to 'source/3rd-party/SDL2/src/atomic')
-rw-r--r--source/3rd-party/SDL2/src/atomic/SDL_atomic.c304
-rw-r--r--source/3rd-party/SDL2/src/atomic/SDL_spinlock.c176
2 files changed, 480 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/atomic/SDL_atomic.c b/source/3rd-party/SDL2/src/atomic/SDL_atomic.c
new file mode 100644
index 0000000..d0022cd
--- /dev/null
+++ b/source/3rd-party/SDL2/src/atomic/SDL_atomic.c
@@ -0,0 +1,304 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#include "SDL_atomic.h"
+
+#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 !defined(HAVE_GCC_ATOMICS) && defined(__SOLARIS__)
+#include <atomic.h>
+#endif
+
+/* The __atomic_load_n() intrinsic showed up in different times for different compilers. */
+#if defined(HAVE_GCC_ATOMICS)
+# if defined(__clang__)
+# if __has_builtin(__atomic_load_n)
+ /* !!! FIXME: this advertises as available in the NDK but uses an external symbol we don't have.
+ It might be in a later NDK or we might need an extra library? --ryan. */
+# if !defined(__ANDROID__)
+# define HAVE_ATOMIC_LOAD_N 1
+# endif
+# endif
+# elif defined(__GNUC__)
+# if (__GNUC__ >= 5)
+# define HAVE_ATOMIC_LOAD_N 1
+# endif
+# endif
+#endif
+
+#if defined(__WATCOMC__) && defined(__386__)
+SDL_COMPILE_TIME_ASSERT(intsize, 4==sizeof(int));
+#define HAVE_WATCOM_ATOMICS
+extern _inline int _SDL_xchg_watcom(volatile int *a, int v);
+#pragma aux _SDL_xchg_watcom = \
+ "lock xchg [ecx], eax" \
+ parm [ecx] [eax] \
+ value [eax] \
+ modify exact [eax];
+
+extern _inline unsigned char _SDL_cmpxchg_watcom(volatile int *a, int newval, int oldval);
+#pragma aux _SDL_cmpxchg_watcom = \
+ "lock cmpxchg [edx], ecx" \
+ "setz al" \
+ parm [edx] [ecx] [eax] \
+ value [al] \
+ modify exact [eax];
+
+extern _inline int _SDL_xadd_watcom(volatile int *a, int v);
+#pragma aux _SDL_xadd_watcom = \
+ "lock xadd [ecx], eax" \
+ parm [ecx] [eax] \
+ value [eax] \
+ modify exact [eax];
+#endif /* __WATCOMC__ && __386__ */
+
+/*
+ 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.
+
+ Contributed by Bob Pendleton, bob@pendleton.com
+*/
+
+#if !defined(HAVE_MSC_ATOMICS) && !defined(HAVE_GCC_ATOMICS) && !defined(__MACOSX__) && !defined(__SOLARIS__) && !defined(HAVE_WATCOM_ATOMICS)
+#define EMULATE_CAS 1
+#endif
+
+#if EMULATE_CAS
+static SDL_SpinLock locks[32];
+
+static SDL_INLINE void
+enterLock(void *a)
+{
+ uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f);
+
+ SDL_AtomicLock(&locks[index]);
+}
+
+static SDL_INLINE void
+leaveLock(void *a)
+{
+ uintptr_t index = ((((uintptr_t)a) >> 3) & 0x1f);
+
+ SDL_AtomicUnlock(&locks[index]);
+}
+#endif
+
+
+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(HAVE_WATCOM_ATOMICS)
+ return (SDL_bool) _SDL_cmpxchg_watcom(&a->value, newval, oldval);
+#elif defined(HAVE_GCC_ATOMICS)
+ return (SDL_bool) __sync_bool_compare_and_swap(&a->value, oldval, newval);
+#elif defined(__MACOSX__) /* this is deprecated in 10.12 sdk; favor gcc atomics. */
+ return (SDL_bool) OSAtomicCompareAndSwap32Barrier(oldval, newval, &a->value);
+#elif defined(__SOLARIS__) && defined(_LP64)
+ return (SDL_bool) ((int) atomic_cas_64((volatile uint64_t*)&a->value, (uint64_t)oldval, (uint64_t)newval) == oldval);
+#elif defined(__SOLARIS__) && !defined(_LP64)
+ return (SDL_bool) ((int) atomic_cas_32((volatile uint32_t*)&a->value, (uint32_t)oldval, (uint32_t)newval) == oldval);
+#elif EMULATE_CAS
+ SDL_bool retval = SDL_FALSE;
+
+ enterLock(a);
+ if (a->value == oldval) {
+ a->value = newval;
+ retval = SDL_TRUE;
+ }
+ leaveLock(a);
+
+ return retval;
+#else
+ #error Please define your platform.
+#endif
+}
+
+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(HAVE_WATCOM_ATOMICS)
+ return (SDL_bool) _SDL_cmpxchg_watcom((int *)a, (long)newval, (long)oldval);
+#elif defined(HAVE_GCC_ATOMICS)
+ return __sync_bool_compare_and_swap(a, oldval, newval);
+#elif defined(__MACOSX__) && defined(__LP64__) /* this is deprecated in 10.12 sdk; favor gcc atomics. */
+ return (SDL_bool) OSAtomicCompareAndSwap64Barrier((int64_t)oldval, (int64_t)newval, (int64_t*) a);
+#elif defined(__MACOSX__) && !defined(__LP64__) /* this is deprecated in 10.12 sdk; favor gcc atomics. */
+ return (SDL_bool) OSAtomicCompareAndSwap32Barrier((int32_t)oldval, (int32_t)newval, (int32_t*) a);
+#elif defined(__SOLARIS__)
+ return (SDL_bool) (atomic_cas_ptr(a, oldval, newval) == oldval);
+#elif EMULATE_CAS
+ SDL_bool retval = SDL_FALSE;
+
+ enterLock(a);
+ if (*a == oldval) {
+ *a = newval;
+ retval = SDL_TRUE;
+ }
+ leaveLock(a);
+
+ return retval;
+#else
+ #error Please define your platform.
+#endif
+}
+
+int
+SDL_AtomicSet(SDL_atomic_t *a, int v)
+{
+#ifdef HAVE_MSC_ATOMICS
+ return _InterlockedExchange((long*)&a->value, v);
+#elif defined(HAVE_WATCOM_ATOMICS)
+ return _SDL_xchg_watcom(&a->value, v);
+#elif defined(HAVE_GCC_ATOMICS)
+ return __sync_lock_test_and_set(&a->value, v);
+#elif defined(__SOLARIS__) && defined(_LP64)
+ return (int) atomic_swap_64((volatile uint64_t*)&a->value, (uint64_t)v);
+#elif defined(__SOLARIS__) && !defined(_LP64)
+ return (int) atomic_swap_32((volatile uint32_t*)&a->value, (uint32_t)v);
+#else
+ int value;
+ do {
+ value = a->value;
+ } while (!SDL_AtomicCAS(a, value, v));
+ return value;
+#endif
+}
+
+void*
+SDL_AtomicSetPtr(void **a, void *v)
+{
+#if defined(HAVE_MSC_ATOMICS) && (_M_IX86)
+ return (void *) _InterlockedExchange((long *)a, (long) v);
+#elif defined(HAVE_MSC_ATOMICS) && (!_M_IX86)
+ return _InterlockedExchangePointer(a, v);
+#elif defined(HAVE_WATCOM_ATOMICS)
+ return (void *) _SDL_xchg_watcom((int *)a, (long)v);
+#elif defined(HAVE_GCC_ATOMICS)
+ return __sync_lock_test_and_set(a, v);
+#elif defined(__SOLARIS__)
+ return atomic_swap_ptr(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_WATCOM_ATOMICS)
+ return _SDL_xadd_watcom(&a->value, v);
+#elif defined(HAVE_GCC_ATOMICS)
+ return __sync_fetch_and_add(&a->value, v);
+#elif defined(__SOLARIS__)
+ int pv = a->value;
+ membar_consumer();
+#if defined(_LP64)
+ atomic_add_64((volatile uint64_t*)&a->value, v);
+#elif !defined(_LP64)
+ atomic_add_32((volatile uint32_t*)&a->value, v);
+#endif
+ return pv;
+#else
+ int value;
+ do {
+ value = a->value;
+ } while (!SDL_AtomicCAS(a, value, (value + v)));
+ return value;
+#endif
+}
+
+int
+SDL_AtomicGet(SDL_atomic_t *a)
+{
+#ifdef HAVE_ATOMIC_LOAD_N
+ return __atomic_load_n(&a->value, __ATOMIC_SEQ_CST);
+#else
+ int value;
+ do {
+ value = a->value;
+ } while (!SDL_AtomicCAS(a, value, value));
+ return value;
+#endif
+}
+
+void *
+SDL_AtomicGetPtr(void **a)
+{
+#ifdef HAVE_ATOMIC_LOAD_N
+ return __atomic_load_n(a, __ATOMIC_SEQ_CST);
+#else
+ void *value;
+ do {
+ value = *a;
+ } while (!SDL_AtomicCASPtr(a, value, value));
+ return value;
+#endif
+}
+
+void
+SDL_MemoryBarrierReleaseFunction(void)
+{
+ SDL_MemoryBarrierRelease();
+}
+
+void
+SDL_MemoryBarrierAcquireFunction(void)
+{
+ SDL_MemoryBarrierAcquire();
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/atomic/SDL_spinlock.c b/source/3rd-party/SDL2/src/atomic/SDL_spinlock.c
new file mode 100644
index 0000000..6a7b14a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/atomic/SDL_spinlock.c
@@ -0,0 +1,176 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#if defined(__WIN32__) || defined(__WINRT__)
+#include "../core/windows/SDL_windows.h"
+#endif
+
+#include "SDL_atomic.h"
+#include "SDL_mutex.h"
+#include "SDL_timer.h"
+
+#if !defined(HAVE_GCC_ATOMICS) && defined(__SOLARIS__)
+#include <atomic.h>
+#endif
+
+#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+#include <xmmintrin.h>
+#endif
+
+#if defined(__WATCOMC__) && defined(__386__)
+SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock));
+extern _inline int _SDL_xchg_watcom(volatile int *a, int v);
+#pragma aux _SDL_xchg_watcom = \
+ "lock xchg [ecx], eax" \
+ parm [ecx] [eax] \
+ value [eax] \
+ modify exact [eax];
+#endif /* __WATCOMC__ && __386__ */
+
+/* This function is where all the magic happens... */
+SDL_bool
+SDL_AtomicTryLock(SDL_SpinLock *lock)
+{
+#if SDL_ATOMIC_DISABLED
+ /* Terrible terrible damage */
+ static SDL_mutex *_spinlock_mutex;
+
+ if (!_spinlock_mutex) {
+ /* Race condition on first lock... */
+ _spinlock_mutex = SDL_CreateMutex();
+ }
+ SDL_LockMutex(_spinlock_mutex);
+ if (*lock == 0) {
+ *lock = 1;
+ SDL_UnlockMutex(_spinlock_mutex);
+ return SDL_TRUE;
+ } else {
+ SDL_UnlockMutex(_spinlock_mutex);
+ return SDL_FALSE;
+ }
+
+#elif defined(_MSC_VER)
+ SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long));
+ return (InterlockedExchange((long*)lock, 1) == 0);
+
+#elif defined(__WATCOMC__) && defined(__386__)
+ return _SDL_xchg_watcom(lock, 1) == 0;
+
+#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
+ return (__sync_lock_test_and_set(lock, 1) == 0);
+
+#elif defined(__GNUC__) && defined(__arm__) && \
+ (defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \
+ defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5TE__) || \
+ defined(__ARM_ARCH_5TEJ__))
+ int result;
+ __asm__ __volatile__ (
+ "swp %0, %1, [%2]\n"
+ : "=&r,&r" (result) : "r,0" (1), "r,r" (lock) : "memory");
+ return (result == 0);
+
+#elif defined(__GNUC__) && defined(__arm__)
+ int result;
+ __asm__ __volatile__ (
+ "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]"
+ : "=&r" (result) : "r" (1), "r" (lock) : "cc", "memory");
+ return (result == 0);
+
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+ int result;
+ __asm__ __volatile__(
+ "lock ; xchgl %0, (%1)\n"
+ : "=r" (result) : "r" (lock), "0" (1) : "cc", "memory");
+ return (result == 0);
+
+#elif defined(__MACOSX__) || defined(__IPHONEOS__)
+ /* Maybe used for PowerPC, but the Intel asm or gcc atomics are favored. */
+ return OSAtomicCompareAndSwap32Barrier(0, 1, lock);
+
+#elif defined(__SOLARIS__) && defined(_LP64)
+ /* Used for Solaris with non-gcc compilers. */
+ return (SDL_bool) ((int) atomic_cas_64((volatile uint64_t*)lock, 0, 1) == 0);
+
+#elif defined(__SOLARIS__) && !defined(_LP64)
+ /* Used for Solaris with non-gcc compilers. */
+ return (SDL_bool) ((int) atomic_cas_32((volatile uint32_t*)lock, 0, 1) == 0);
+
+#else
+#error Please implement for your platform.
+ return SDL_FALSE;
+#endif
+}
+
+/* "REP NOP" is PAUSE, coded for tools that don't know it by that name. */
+#if (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
+ #define PAUSE_INSTRUCTION() __asm__ __volatile__("pause\n") /* Some assemblers can't do REP NOP, so go with PAUSE. */
+#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+ #define PAUSE_INSTRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. No inline asm in MSVC x86-64! */
+#elif defined(__WATCOMC__) && defined(__386__)
+ /* watcom assembler rejects PAUSE if CPU < i686, and it refuses REP NOP as an invalid combination. Hardcode the bytes. */
+ extern _inline void PAUSE_INSTRUCTION(void);
+ #pragma aux PAUSE_INSTRUCTION = "db 0f3h,90h"
+#else
+ #define PAUSE_INSTRUCTION()
+#endif
+
+void
+SDL_AtomicLock(SDL_SpinLock *lock)
+{
+ int iterations = 0;
+ /* FIXME: Should we have an eventual timeout? */
+ while (!SDL_AtomicTryLock(lock)) {
+ if (iterations < 32) {
+ iterations++;
+ PAUSE_INSTRUCTION();
+ } else {
+ /* !!! FIXME: this doesn't definitely give up the current timeslice, it does different things on various platforms. */
+ SDL_Delay(0);
+ }
+ }
+}
+
+void
+SDL_AtomicUnlock(SDL_SpinLock *lock)
+{
+#if defined(_MSC_VER)
+ _ReadWriteBarrier();
+ *lock = 0;
+
+#elif defined(__WATCOMC__) && defined(__386__)
+ SDL_CompilerBarrier ();
+ *lock = 0;
+
+#elif HAVE_GCC_ATOMICS || HAVE_GCC_SYNC_LOCK_TEST_AND_SET
+ __sync_lock_release(lock);
+
+#elif defined(__SOLARIS__)
+ /* Used for Solaris when not using gcc. */
+ *lock = 0;
+ membar_producer();
+
+#else
+ *lock = 0;
+#endif
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
generated by cgit v1.1-26-g67d0 at 2025-05-19 01:19:09 +0000