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catomic.h
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/*
C89 compatible atomics. Choice of public domain or MIT-0. See license statements at the end of this file.
David Reid - [email protected]
*/
#ifndef C_ATOMIC_H
#define C_ATOMIC_H
#include <stdint.h>
#if defined(__cplusplus)
extern "C" {
#endif
#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wlong-long"
#if defined(__clang__)
#pragma GCC diagnostic ignored "-Wc++11-long-long"
#endif
#endif
#ifndef __ATOMIC_RELAXED
# define __ATOMIC_RELAXED 0
# define __ATOMIC_CONSUME 1
# define __ATOMIC_ACQUIRE 2
# define __ATOMIC_RELEASE 3
# define __ATOMIC_ACQ_REL 4
# define __ATOMIC_SEQ_CST 5
#endif
#ifndef _STDATOMIC_H
/* Memory ordering */
typedef enum {
memory_order_relaxed = __ATOMIC_RELAXED,
memory_order_consume = __ATOMIC_CONSUME,
memory_order_acquire = __ATOMIC_ACQUIRE,
memory_order_release = __ATOMIC_RELEASE,
memory_order_acq_rel = __ATOMIC_ACQ_REL,
memory_order_seq_cst = __ATOMIC_SEQ_CST,
} memory_order;
#endif
typedef int c89atomic_memory_order;
/* Sized Types */
typedef signed char c89atomic_int8;
typedef unsigned char c89atomic_uint8;
typedef signed short c89atomic_int16;
typedef unsigned short c89atomic_uint16;
typedef signed int c89atomic_int32;
typedef unsigned int c89atomic_uint32;
#if defined(_MSC_VER) && !defined(__clang__)
typedef signed __int64 c89atomic_int64;
typedef unsigned __int64 c89atomic_uint64;
#else
typedef signed long long c89atomic_int64;
typedef unsigned long long c89atomic_uint64;
#endif
typedef unsigned char c89atomic_bool;
/* End Sized Types */
#if defined(_WIN32) || defined(__APPLE__)
# define make_atomic(type, var) typedef volatile type var;
#else
# define make_atomic(type, var) typedef volatile _Atomic(type)var;
#endif
#ifndef _STDATOMIC_H
make_atomic(c89atomic_bool, atomic_bool)
make_atomic(c89atomic_int8, atomic_char)
make_atomic(c89atomic_int8, atomic_schar)
make_atomic(c89atomic_uint8, atomic_uchar)
make_atomic(c89atomic_int16, atomic_short)
make_atomic(c89atomic_uint16, atomic_ushort)
make_atomic(c89atomic_int32, atomic_int)
make_atomic(c89atomic_uint32, atomic_uint)
make_atomic(signed long, atomic_long)
make_atomic(unsigned long, atomic_ulong)
make_atomic(c89atomic_int64, atomic_llong)
make_atomic(c89atomic_uint64, atomic_ullong)
make_atomic(intptr_t, atomic_intptr_t)
make_atomic(uintptr_t, atomic_uintptr_t)
make_atomic(intmax_t, atomic_intmax_t)
make_atomic(uintmax_t, atomic_uintmax_t)
#endif
#if !defined(_STDATOMIC_H) && (defined(_WIN32) || defined(__APPLE__))
make_atomic(size_t, atomic_size_t)
make_atomic(ptrdiff_t, atomic_ptrdiff_t)
#elif !defined(_STDATOMIC_H)
make_atomic(__SIZE_TYPE__, atomic_size_t)
make_atomic(__PTRDIFF_TYPE__, atomic_ptrdiff_t)
#endif
make_atomic(void *, atomic_ptr_t)
#if defined(__TINYC__) || defined(_MSC_VER)
# define c89atomic_is_lock_free(obj) (sizeof((obj)) <= sizeof(void *))
#endif
/* Architecture Detection */
#if !defined(C89ATOMIC_64BIT) && !defined(C89ATOMIC_32BIT)
#ifdef _WIN32
#ifdef _WIN64
#define C89ATOMIC_64BIT
#else
#define C89ATOMIC_32BIT
#endif
#endif
#endif
#if !defined(C89ATOMIC_64BIT) && !defined(C89ATOMIC_32BIT)
#ifdef __GNUC__
#ifdef __LP64__
#define C89ATOMIC_64BIT
#else
#define C89ATOMIC_32BIT
#endif
#endif
#endif
#if !defined(C89ATOMIC_64BIT) && !defined(C89ATOMIC_32BIT)
#if INTPTR_MAX == INT64_MAX
#define C89ATOMIC_64BIT
#else
#define C89ATOMIC_32BIT
#endif
#endif
#if defined(__arm__) || defined(_M_ARM)
#define C89ATOMIC_ARM32
#endif
#if defined(__arm64) || defined(__arm64__) || defined(__aarch64__) || defined(_M_ARM64)
#define C89ATOMIC_ARM64
#endif
#if defined(__x86_64__) || defined(_M_X64)
#define C89ATOMIC_X64
#elif defined(__i386) || defined(_M_IX86)
#define C89ATOMIC_X86
#elif defined(C89ATOMIC_ARM32) || defined(C89ATOMIC_ARM64)
#define C89ATOMIC_ARM
#endif
/* End Architecture Detection */
/* Inline */
/* We want to encourage the compiler to inline. When adding support for a new compiler, make sure it's handled here. */
#if defined(_MSC_VER)
# define C89ATOMIC_INLINE __forceinline
#elif defined(__GNUC__)
/*
I've had a bug report where GCC is emitting warnings about functions possibly not being inlineable. This warning happens when
the __attribute__((always_inline)) attribute is defined without an "inline" statement. I think therefore there must be some
case where "__inline__" is not always defined, thus the compiler emitting these warnings. When using -std=c89 or -ansi on the
command line, we cannot use the "inline" keyword and instead need to use "__inline__". In an attempt to work around this issue
I am using "__inline__" only when we're compiling in strict ANSI mode.
*/
#if defined(__STRICT_ANSI__) || !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
#define C89ATOMIC_INLINE __inline__ __attribute__((always_inline))
#else
#define C89ATOMIC_INLINE inline __attribute__((always_inline))
#endif
#elif defined(__WATCOMC__) || defined(__DMC__)
#define C89ATOMIC_INLINE __inline
#else
#define C89ATOMIC_INLINE
#endif
/* End Inline */
/* Assume everything supports all standard sized atomics by default. We'll #undef these when not supported. */
#define C89ATOMIC_HAS_8
#define C89ATOMIC_HAS_16
#define C89ATOMIC_HAS_32
#define C89ATOMIC_HAS_64
#if (defined(_MSC_VER) /*&& !defined(__clang__)*/) || defined(__WATCOMC__) || defined(__DMC__)
/* Visual C++. */
#define C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, intrin, c89atomicType, msvcType) \
c89atomicType result; \
switch (order) \
{ \
case c89atomic_memory_order_relaxed: \
{ \
result = (c89atomicType)intrin##_nf((volatile msvcType*)dst, (msvcType)src); \
} break; \
case c89atomic_memory_order_consume: \
case c89atomic_memory_order_acquire: \
{ \
result = (c89atomicType)intrin##_acq((volatile msvcType*)dst, (msvcType)src); \
} break; \
case c89atomic_memory_order_release: \
{ \
result = (c89atomicType)intrin##_rel((volatile msvcType*)dst, (msvcType)src); \
} break; \
case c89atomic_memory_order_acq_rel: \
case c89atomic_memory_order_seq_cst: \
default: \
{ \
result = (c89atomicType)intrin((volatile msvcType*)dst, (msvcType)src); \
} break; \
} \
return result;
#define C89ATOMIC_MSVC_ARM_INTRINSIC_COMPARE_EXCHANGE(ptr, expected, desired, order, intrin, c89atomicType, msvcType) \
c89atomicType result; \
switch (order) \
{ \
case c89atomic_memory_order_relaxed: \
{ \
result = (c89atomicType)intrin##_nf((volatile msvcType*)ptr, (msvcType)expected, (msvcType)desired); \
} break; \
case c89atomic_memory_order_consume: \
case c89atomic_memory_order_acquire: \
{ \
result = (c89atomicType)intrin##_acq((volatile msvcType*)ptr, (msvcType)expected, (msvcType)desired); \
} break; \
case c89atomic_memory_order_release: \
{ \
result = (c89atomicType)intrin##_rel((volatile msvcType*)ptr, (msvcType)expected, (msvcType)desired); \
} break; \
case c89atomic_memory_order_acq_rel: \
case c89atomic_memory_order_seq_cst: \
default: \
{ \
result = (c89atomicType)intrin((volatile msvcType*)ptr, (msvcType)expected, (msvcType)desired); \
} break; \
} \
return result;
#define c89atomic_memory_order_relaxed 0
#define c89atomic_memory_order_consume 1
#define c89atomic_memory_order_acquire 2
#define c89atomic_memory_order_release 3
#define c89atomic_memory_order_acq_rel 4
#define c89atomic_memory_order_seq_cst 5
/*
Visual Studio 2003 (_MSC_VER 1300) and earlier have no support for sized atomic operations.
We'll need to use inlined assembly for these compilers.
I've also had a report that 8-bit and 16-bit interlocked intrinsics were only added in Visual
Studio 2010 (_MSC_VER 1600). We'll need to disable these on the 64-bit build because there's
no way to implement them with inlined assembly since Microsoft has decided to drop support for
it from their 64-bit compilers.
To simplify the implementation, any older MSVC compilers targeting 32-bit will use inlined
assembly for everything. I'm not going to use inlined assembly wholesale for all 32-bit builds
regardless of the age of the compiler because I don't trust the compiler will optimize the
inlined assembly properly.
The inlined assembly path supports both MSVC, Digital Mars and OpenWatcom. OpenWatcom is a little
bit too pedantic with it's warnings. A few notes:
- The return value of these functions are defined by the AL/AX/EAX/EAX:EDX registers which
means an explicit return statement is not actually necessary. This is helpful for performance
reasons because it means we can avoid the cost of a declaring a local variable and moving the
value in EAX into that variable, only to then return it. However, unfortunately OpenWatcom
thinks this is a mistake and tries to be helpful by throwing a warning. To work around we're
going to declare a "result" variable and incur this theoretical cost. Most likely the
compiler will optimize this away and make it a non-issue.
- Variables that are assigned within the inline assembly will not be detected as such, and
OpenWatcom will throw a warning about the variable being used without being assigned. To work
around this we just initialize our local variables to 0.
*/
#if _MSC_VER < 1600 && defined(C89ATOMIC_X86) /* 1600 = Visual Studio 2010 */
#define C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY
#endif
#if _MSC_VER < 1600
#undef C89ATOMIC_HAS_8
#undef C89ATOMIC_HAS_16
#endif
/* We need <intrin.h>, but only if we're not using inlined assembly. */
#if !defined(C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY)
#include <intrin.h>
#endif
/* atomic_compare_and_swap */
#if defined(C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY)
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_compare_and_swap_8(volatile c89atomic_uint8* dst, c89atomic_uint8 expected, c89atomic_uint8 desired)
{
c89atomic_uint8 result = 0;
__asm {
mov ecx, dst
mov al, expected
mov dl, desired
lock cmpxchg [ecx], dl /* Writes to EAX which MSVC will treat as the return value. */
mov result, al
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_compare_and_swap_16(volatile c89atomic_uint16* dst, c89atomic_uint16 expected, c89atomic_uint16 desired)
{
c89atomic_uint16 result = 0;
__asm {
mov ecx, dst
mov ax, expected
mov dx, desired
lock cmpxchg [ecx], dx /* Writes to EAX which MSVC will treat as the return value. */
mov result, ax
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_compare_and_swap_32(volatile c89atomic_uint32* dst, c89atomic_uint32 expected, c89atomic_uint32 desired)
{
c89atomic_uint32 result = 0;
__asm {
mov ecx, dst
mov eax, expected
mov edx, desired
lock cmpxchg [ecx], edx /* Writes to EAX which MSVC will treat as the return value. */
mov result, eax
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_compare_and_swap_64(volatile c89atomic_uint64* dst, c89atomic_uint64 expected, c89atomic_uint64 desired)
{
c89atomic_uint32 resultEAX = 0;
c89atomic_uint32 resultEDX = 0;
__asm {
mov esi, dst /* From Microsoft documentation: "... you don't need to preserve the EAX, EBX, ECX, EDX, ESI, or EDI registers." Choosing ESI since it's the next available one in their list. */
mov eax, dword ptr expected
mov edx, dword ptr expected + 4
mov ebx, dword ptr desired
mov ecx, dword ptr desired + 4
lock cmpxchg8b qword ptr [esi] /* Writes to EAX:EDX which MSVC will treat as the return value. */
mov resultEAX, eax
mov resultEDX, edx
}
return ((c89atomic_uint64)resultEDX << 32) | resultEAX;
}
#endif
#else
#if defined(C89ATOMIC_HAS_8)
#define c89atomic_compare_and_swap_8( dst, expected, desired) (c89atomic_uint8 )_InterlockedCompareExchange8((volatile char*)dst, (char)desired, (char)expected)
#endif
#if defined(C89ATOMIC_HAS_16)
#define c89atomic_compare_and_swap_16(dst, expected, desired) (c89atomic_uint16)_InterlockedCompareExchange16((volatile short*)dst, (short)desired, (short)expected)
#endif
#if defined(C89ATOMIC_HAS_32)
#define c89atomic_compare_and_swap_32(dst, expected, desired) (c89atomic_uint32)_InterlockedCompareExchange((volatile long*)dst, (long)desired, (long)expected)
#endif
#if defined(C89ATOMIC_HAS_64)
#define c89atomic_compare_and_swap_64(dst, expected, desired) (c89atomic_uint64)_InterlockedCompareExchange64((volatile c89atomic_int64*)dst, (c89atomic_int64)desired, (c89atomic_int64)expected)
#endif
#endif
/* atomic_exchange_explicit */
#if defined(C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY)
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_exchange_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
c89atomic_uint8 result = 0;
(void)order;
__asm {
mov ecx, dst
mov al, src
lock xchg [ecx], al
mov result, al
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_exchange_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
c89atomic_uint16 result = 0;
(void)order;
__asm {
mov ecx, dst
mov ax, src
lock xchg [ecx], ax
mov result, ax
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_exchange_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
c89atomic_uint32 result = 0;
(void)order;
__asm {
mov ecx, dst
mov eax, src
lock xchg [ecx], eax
mov result, eax
}
return result;
}
#endif
#else
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_exchange_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchange8, c89atomic_uint8, char);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint8)_InterlockedExchange8((volatile char*)dst, (char)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_exchange_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchange16, c89atomic_uint16, short);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint16)_InterlockedExchange16((volatile short*)dst, (short)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_exchange_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchange, c89atomic_uint32, long);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint32)_InterlockedExchange((volatile long*)dst, (long)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64) && defined(C89ATOMIC_64BIT)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_exchange_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchange64, c89atomic_uint64, long long);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint64)_InterlockedExchange64((volatile long long*)dst, (long long)src);
#endif
}
#else
/* Implemented below. */
#endif
#endif
#if defined(C89ATOMIC_HAS_64) && !defined(C89ATOMIC_64BIT) /* atomic_exchange_explicit_64() must be implemented in terms of atomic_compare_and_swap() on 32-bit builds, no matter the version of Visual Studio. */
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_exchange_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
c89atomic_uint64 oldValue;
do {
oldValue = *dst;
} while (c89atomic_compare_and_swap_64(dst, oldValue, src) != oldValue);
(void)order; /* Always using the strongest memory order. */
return oldValue;
}
#endif
/* atomic_fetch_add */
#if defined(C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY)
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_add_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
c89atomic_uint8 result = 0;
(void)order;
__asm {
mov ecx, dst
mov al, src
lock xadd [ecx], al
mov result, al
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_add_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
c89atomic_uint16 result = 0;
(void)order;
__asm {
mov ecx, dst
mov ax, src
lock xadd [ecx], ax
mov result, ax
}
return result;
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_add_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
c89atomic_uint32 result = 0;
(void)order;
__asm {
mov ecx, dst
mov eax, src
lock xadd [ecx], eax
mov result, eax
}
return result;
}
#endif
#else
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_add_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchangeAdd8, c89atomic_uint8, char);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint8)_InterlockedExchangeAdd8((volatile char*)dst, (char)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_add_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchangeAdd16, c89atomic_uint16, short);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint16)_InterlockedExchangeAdd16((volatile short*)dst, (short)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_add_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchangeAdd, c89atomic_uint32, long);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint32)_InterlockedExchangeAdd((volatile long*)dst, (long)src);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64) && defined(C89ATOMIC_64BIT)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_add_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedExchangeAdd64, c89atomic_uint64, long long);
#else
(void)order; /* Always using the strongest memory order. */
return (c89atomic_uint64)_InterlockedExchangeAdd64((volatile long long*)dst, (long long)src);
#endif
}
#else
/* Implemented below. */
#endif
#endif
#if defined(C89ATOMIC_HAS_64) && !defined(C89ATOMIC_64BIT) /* 9atomic_fetch_add_explicit_64() must be implemented in terms of atomic_compare_and_swap() on 32-bit builds, no matter the version of Visual Studio. */
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_add_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
c89atomic_uint64 oldValue;
c89atomic_uint64 newValue;
do {
oldValue = *dst;
newValue = oldValue + src;
} while (c89atomic_compare_and_swap_64(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
}
#endif
/* atomic_thread_fence */
#if defined(C89ATOMIC_MSVC_USE_INLINED_ASSEMBLY)
static C89ATOMIC_INLINE void __stdcall c89atomic_thread_fence(c89atomic_memory_order order)
{
(void)order;
__asm {
lock add [esp], 0
}
}
#else
#define c89atomic_thread_fence(order) MemoryBarrier()
#endif
/*
I'm not sure how to implement a compiler barrier for old MSVC so I'm just making it a thread_fence() and hopefully the compiler will see the volatile and not do
any reshuffling. If anybody has a better idea on this please let me know! Cannot use _ReadWriteBarrier() as it has been marked as deprecated.
*/
#define c89atomic_compiler_fence() c89atomic_thread_fence(c89atomic_memory_order_seq_cst)
#define c89atomic_signal_fence(order) _ReadWriteBarrier()
/* Atomic loads can be implemented in terms of a compare-and-swap. Need to implement as functions to silence warnings about `order` being unused. */
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 c89atomic_load_explicit_8(volatile const c89atomic_uint8* ptr, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC_COMPARE_EXCHANGE(ptr, 0, 0, order, _InterlockedCompareExchange8, c89atomic_uint8, char);
#else
(void)order; /* Always using the strongest memory order. */
return c89atomic_compare_and_swap_8((volatile c89atomic_uint8*)ptr, 0, 0);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 c89atomic_load_explicit_16(volatile const c89atomic_uint16* ptr, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC_COMPARE_EXCHANGE(ptr, 0, 0, order, _InterlockedCompareExchange16, c89atomic_uint16, short);
#else
(void)order; /* Always using the strongest memory order. */
return c89atomic_compare_and_swap_16((volatile c89atomic_uint16*)ptr, 0, 0);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 c89atomic_load_explicit_32(volatile const c89atomic_uint32* ptr, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC_COMPARE_EXCHANGE(ptr, 0, 0, order, _InterlockedCompareExchange, c89atomic_uint32, long);
#else
(void)order; /* Always using the strongest memory order. */
return c89atomic_compare_and_swap_32((volatile c89atomic_uint32*)ptr, 0, 0);
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 c89atomic_load_explicit_64(volatile const c89atomic_uint64* ptr, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC_COMPARE_EXCHANGE(ptr, 0, 0, order, _InterlockedCompareExchange64, c89atomic_uint64, long long);
#else
(void)order; /* Always using the strongest memory order. */
return c89atomic_compare_and_swap_64((volatile c89atomic_uint64*)ptr, 0, 0);
#endif
}
#endif
/* atomic_store() is the same as atomic_exchange() but returns void. */
#if defined(C89ATOMIC_HAS_8)
#define c89atomic_store_explicit_8( dst, src, order) (void)c89atomic_exchange_explicit_8 (dst, src, order)
#endif
#if defined(C89ATOMIC_HAS_16)
#define c89atomic_store_explicit_16(dst, src, order) (void)c89atomic_exchange_explicit_16(dst, src, order)
#endif
#if defined(C89ATOMIC_HAS_32)
#define c89atomic_store_explicit_32(dst, src, order) (void)c89atomic_exchange_explicit_32(dst, src, order)
#endif
#if defined(C89ATOMIC_HAS_64)
#define c89atomic_store_explicit_64(dst, src, order) (void)c89atomic_exchange_explicit_64(dst, src, order)
#endif
/* fetch_sub() */
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_sub_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
c89atomic_uint8 oldValue;
c89atomic_uint8 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint8)(oldValue - src);
} while (c89atomic_compare_and_swap_8(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_sub_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
c89atomic_uint16 oldValue;
c89atomic_uint16 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint16)(oldValue - src);
} while (c89atomic_compare_and_swap_16(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_sub_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
c89atomic_uint32 oldValue;
c89atomic_uint32 newValue;
do {
oldValue = *dst;
newValue = oldValue - src;
} while (c89atomic_compare_and_swap_32(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_sub_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
c89atomic_uint64 oldValue;
c89atomic_uint64 newValue;
do {
oldValue = *dst;
newValue = oldValue - src;
} while (c89atomic_compare_and_swap_64(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
}
#endif
/* fetch_and() */
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_and_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedAnd8, c89atomic_uint8, char);
#else
c89atomic_uint8 oldValue;
c89atomic_uint8 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint8)(oldValue & src);
} while (c89atomic_compare_and_swap_8(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_and_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedAnd16, c89atomic_uint16, short);
#else
c89atomic_uint16 oldValue;
c89atomic_uint16 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint16)(oldValue & src);
} while (c89atomic_compare_and_swap_16(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_and_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedAnd, c89atomic_uint32, long);
#else
c89atomic_uint32 oldValue;
c89atomic_uint32 newValue;
do {
oldValue = *dst;
newValue = oldValue & src;
} while (c89atomic_compare_and_swap_32(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_and_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedAnd64, c89atomic_uint64, long long);
#else
c89atomic_uint64 oldValue;
c89atomic_uint64 newValue;
do {
oldValue = *dst;
newValue = oldValue & src;
} while (c89atomic_compare_and_swap_64(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
/* fetch_xor() */
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_xor_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedXor8, c89atomic_uint8, char);
#else
c89atomic_uint8 oldValue;
c89atomic_uint8 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint8)(oldValue ^ src);
} while (c89atomic_compare_and_swap_8(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_xor_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedXor16, c89atomic_uint16, short);
#else
c89atomic_uint16 oldValue;
c89atomic_uint16 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint16)(oldValue ^ src);
} while (c89atomic_compare_and_swap_16(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_xor_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedXor, c89atomic_uint32, long);
#else
c89atomic_uint32 oldValue;
c89atomic_uint32 newValue;
do {
oldValue = *dst;
newValue = oldValue ^ src;
} while (c89atomic_compare_and_swap_32(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_xor_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedXor64, c89atomic_uint64, long long);
#else
c89atomic_uint64 oldValue;
c89atomic_uint64 newValue;
do {
oldValue = *dst;
newValue = oldValue ^ src;
} while (c89atomic_compare_and_swap_64(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
/* fetch_or() */
#if defined(C89ATOMIC_HAS_8)
static C89ATOMIC_INLINE c89atomic_uint8 __stdcall c89atomic_fetch_or_explicit_8(volatile c89atomic_uint8* dst, c89atomic_uint8 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedOr8, c89atomic_uint8, char);
#else
c89atomic_uint8 oldValue;
c89atomic_uint8 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint8)(oldValue | src);
} while (c89atomic_compare_and_swap_8(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_16)
static C89ATOMIC_INLINE c89atomic_uint16 __stdcall c89atomic_fetch_or_explicit_16(volatile c89atomic_uint16* dst, c89atomic_uint16 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedOr16, c89atomic_uint16, short);
#else
c89atomic_uint16 oldValue;
c89atomic_uint16 newValue;
do {
oldValue = *dst;
newValue = (c89atomic_uint16)(oldValue | src);
} while (c89atomic_compare_and_swap_16(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_32)
static C89ATOMIC_INLINE c89atomic_uint32 __stdcall c89atomic_fetch_or_explicit_32(volatile c89atomic_uint32* dst, c89atomic_uint32 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedOr, c89atomic_uint32, long);
#else
c89atomic_uint32 oldValue;
c89atomic_uint32 newValue;
do {
oldValue = *dst;
newValue = oldValue | src;
} while (c89atomic_compare_and_swap_32(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
#if defined(C89ATOMIC_HAS_64)
static C89ATOMIC_INLINE c89atomic_uint64 __stdcall c89atomic_fetch_or_explicit_64(volatile c89atomic_uint64* dst, c89atomic_uint64 src, c89atomic_memory_order order)
{
#if defined(C89ATOMIC_ARM)
C89ATOMIC_MSVC_ARM_INTRINSIC(dst, src, order, _InterlockedOr64, c89atomic_uint64, long long);
#else
c89atomic_uint64 oldValue;
c89atomic_uint64 newValue;
do {
oldValue = *dst;
newValue = oldValue | src;
} while (c89atomic_compare_and_swap_64(dst, oldValue, newValue) != oldValue);
(void)order;
return oldValue;
#endif
}
#endif
/* test_and_set() */
#if defined(C89ATOMIC_HAS_8)
#define c89atomic_test_and_set_explicit_8( dst, order) c89atomic_exchange_explicit_8 (dst, 1, order)
#endif
#if defined(C89ATOMIC_HAS_16)
#define c89atomic_test_and_set_explicit_16(dst, order) c89atomic_exchange_explicit_16(dst, 1, order)
#endif
#if defined(C89ATOMIC_HAS_32)
#define c89atomic_test_and_set_explicit_32(dst, order) c89atomic_exchange_explicit_32(dst, 1, order)
#endif
#if defined(C89ATOMIC_HAS_64)
#define c89atomic_test_and_set_explicit_64(dst, order) c89atomic_exchange_explicit_64(dst, 1, order)
#endif
/* clear() */
#if defined(C89ATOMIC_HAS_8)
#define c89atomic_clear_explicit_8( dst, order) c89atomic_store_explicit_8 (dst, 0, order)
#endif
#if defined(C89ATOMIC_HAS_16)
#define c89atomic_clear_explicit_16(dst, order) c89atomic_store_explicit_16(dst, 0, order)
#endif
#if defined(C89ATOMIC_HAS_32)
#define c89atomic_clear_explicit_32(dst, order) c89atomic_store_explicit_32(dst, 0, order)
#endif
#if defined(C89ATOMIC_HAS_64)
#define c89atomic_clear_explicit_64(dst, order) c89atomic_store_explicit_64(dst, 0, order)
#endif