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Diffstat (limited to 'v_windows/v/thirdparty/stdatomic/nix/atomic_cpp.h')
| -rw-r--r-- | v_windows/v/thirdparty/stdatomic/nix/atomic_cpp.h | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/v_windows/v/thirdparty/stdatomic/nix/atomic_cpp.h b/v_windows/v/thirdparty/stdatomic/nix/atomic_cpp.h new file mode 100644 index 0000000..252f5c6 --- /dev/null +++ b/v_windows/v/thirdparty/stdatomic/nix/atomic_cpp.h @@ -0,0 +1,541 @@ +// Source: https://android.googlesource.com/platform/bionic/+/lollipop-release/libc/include/stdatomic.h +/*- + * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> + * David Chisnall <theraven@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#ifndef _STDATOMIC_H_ +#define _STDATOMIC_H_ +#include <sys/cdefs.h> +#if defined(__cplusplus) && defined(_USING_LIBCXX) +#ifdef __clang__ +#if __has_feature(cxx_atomic) +#define _STDATOMIC_HAVE_ATOMIC +#endif +#else /* gcc */ +#if __GNUC_PREREQ(4, 7) +#define _STDATOMIC_HAVE_ATOMIC +#endif +#endif +#endif +#ifdef _STDATOMIC_HAVE_ATOMIC +/* We have a usable C++ <atomic>; use it instead. */ +#include <atomic> +#undef _Atomic +/* Also defined by <atomic> for gcc. But not used in macros. */ +/* Also a clang intrinsic. */ +/* Should not be used by client code before this file is */ +/* included. The definitions in <atomic> themselves see */ +/* the old definition, as they should. */ +/* Client code sees the following definition. */ +#define _Atomic(t) std::atomic<t> +using std::atomic_bool; +using std::atomic_char; +using std::atomic_char16_t; +using std::atomic_char32_t; +using std::atomic_compare_exchange_strong; +using std::atomic_compare_exchange_strong_explicit; +using std::atomic_compare_exchange_weak; +using std::atomic_compare_exchange_weak_explicit; +using std::atomic_exchange; +using std::atomic_exchange_explicit; +using std::atomic_fetch_add; +using std::atomic_fetch_add_explicit; +using std::atomic_fetch_and; +using std::atomic_fetch_and_explicit; +using std::atomic_fetch_or; +using std::atomic_fetch_or_explicit; +using std::atomic_fetch_sub; +using std::atomic_fetch_sub_explicit; +using std::atomic_fetch_xor; +using std::atomic_fetch_xor_explicit; +using std::atomic_init; +using std::atomic_int; +using std::atomic_int_fast16_t; +using std::atomic_int_fast32_t; +using std::atomic_int_fast64_t; +using std::atomic_int_fast8_t; +using std::atomic_int_least16_t; +using std::atomic_int_least32_t; +using std::atomic_int_least64_t; +using std::atomic_int_least8_t; +using std::atomic_intmax_t; +using std::atomic_intptr_t; +using std::atomic_is_lock_free; +using std::atomic_llong; +using std::atomic_load; +using std::atomic_load_explicit; +using std::atomic_long; +using std::atomic_ptrdiff_t; +using std::atomic_schar; +using std::atomic_short; +using std::atomic_signal_fence; +using std::atomic_size_t; +using std::atomic_store; +using std::atomic_store_explicit; +using std::atomic_thread_fence; +using std::atomic_uchar; +using std::atomic_uint; +using std::atomic_uint_fast16_t; +using std::atomic_uint_fast32_t; +using std::atomic_uint_fast64_t; +using std::atomic_uint_fast8_t; +using std::atomic_uint_least16_t; +using std::atomic_uint_least32_t; +using std::atomic_uint_least64_t; +using std::atomic_uint_least8_t; +using std::atomic_uintmax_t; +using std::atomic_uintptr_t; +using std::atomic_ullong; +using std::atomic_ulong; +using std::atomic_ushort; +using std::atomic_wchar_t; +using std::memory_order; +using std::memory_order_acq_rel; +using std::memory_order_consume; +using std::memory_order_relaxed; +using std::memory_order_release; +using std::memory_order_seq_cst; +#else /* <atomic> unavailable, possibly because this is C, not C++ */ +#include <sys/types.h> +#include <stdbool.h> +/* + * C: Do it ourselves. + * Note that the runtime representation defined here should be compatible + * with the C++ one, i.e. an _Atomic(T) needs to contain the same + * bits as a T. + */ +#include <stddef.h> /* For ptrdiff_t. */ +#include <stdint.h> /* TODO: Should pollute namespace less. */ +#if __STDC_VERSION__ >= 201112L +#include <uchar.h> /* For char16_t and char32_t. */ +#endif +#ifdef __clang__ +#if __has_extension(c_atomic) || __has_extension(cxx_atomic) +#define __CLANG_ATOMICS +#else +#error "stdatomic.h does not support your compiler" +#endif +#if __has_builtin(__sync_swap) +#define __HAS_BUILTIN_SYNC_SWAP +#endif +#else +#if __GNUC_PREREQ(4, 7) +#define __GNUC_ATOMICS +#else +#define __SYNC_ATOMICS +#ifdef __cplusplus +#define __ATOMICS_AVOID_DOT_INIT +#endif +#endif +#endif +/* + * 7.17.1 Atomic lock-free macros. + */ +#ifdef __GCC_ATOMIC_BOOL_LOCK_FREE +#define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_BOOL_LOCK_FREE 2 /* For all modern platforms */ +#endif +#ifdef __GCC_ATOMIC_CHAR_LOCK_FREE +#define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_CHAR_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE +#define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_CHAR16_T_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE +#define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_CHAR32_T_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE +#define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_WCHAR_T_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_SHORT_LOCK_FREE +#define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_SHORT_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_INT_LOCK_FREE +#define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_INT_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_LONG_LOCK_FREE +#define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_LONG_LOCK_FREE 2 +#endif +#ifdef __GCC_ATOMIC_LLONG_LOCK_FREE +#define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_LLONG_LOCK_FREE 1 /* maybe */ +#endif +#ifdef __GCC_ATOMIC_POINTER_LOCK_FREE +#define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE +#elif defined(__SYNC_ATOMICS) +#define ATOMIC_POINTER_LOCK_FREE 2 +#endif +/* + * 7.17.2 Initialization. + */ +#if defined(__CLANG_ATOMICS) +#define ATOMIC_VAR_INIT(value) (value) +#define atomic_init(obj, value) __c11_atomic_init(obj, value) +#else +#ifdef __ATOMICS_AVOID_DOT_INIT +#define ATOMIC_VAR_INIT(value) \ + { \ + value \ + } +#else +#define ATOMIC_VAR_INIT(value) \ + { \ + .__val = (value) \ + } +#endif +#define atomic_init(obj, value) ((void)((obj)->__val = (value))) +#endif +/* + * Clang and recent GCC both provide predefined macros for the memory + * orderings. If we are using a compiler that doesn't define them, use the + * clang values - these will be ignored in the fallback path. + */ +#ifndef __ATOMIC_RELAXED +#define __ATOMIC_RELAXED 0 +#endif +#ifndef __ATOMIC_CONSUME +#define __ATOMIC_CONSUME 1 +#endif +#ifndef __ATOMIC_ACQUIRE +#define __ATOMIC_ACQUIRE 2 +#endif +#ifndef __ATOMIC_RELEASE +#define __ATOMIC_RELEASE 3 +#endif +#ifndef __ATOMIC_ACQ_REL +#define __ATOMIC_ACQ_REL 4 +#endif +#ifndef __ATOMIC_SEQ_CST +#define __ATOMIC_SEQ_CST 5 +#endif +/* + * 7.17.3 Order and consistency. + * + * The memory_order_* constants that denote the barrier behaviour of the + * atomic operations. + * The enum values must be identical to those used by the + * C++ <atomic> header. + */ +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; +/* + * 7.17.4 Fences. + */ +static __inline void +atomic_thread_fence(memory_order __order __attribute__((unused))) +{ +#ifdef __CLANG_ATOMICS + __c11_atomic_thread_fence(__order); +#elif defined(__GNUC_ATOMICS) + __atomic_thread_fence(__order); +#else + __sync_synchronize(); +#endif +} +static __inline void +atomic_signal_fence(memory_order __order __attribute__((unused))) +{ +#ifdef __CLANG_ATOMICS + __c11_atomic_signal_fence(__order); +#elif defined(__GNUC_ATOMICS) + __atomic_signal_fence(__order); +#else + __asm volatile("" :: + : "memory"); +#endif +} +/* + * 7.17.5 Lock-free property. + */ +#if defined(_KERNEL) +/* Atomics in kernelspace are always lock-free. */ +#define atomic_is_lock_free(obj) \ + ((void)(obj), (_Bool)1) +#elif defined(__CLANG_ATOMICS) +#define atomic_is_lock_free(obj) \ + __c11_atomic_is_lock_free(sizeof(*(obj))) +#elif defined(__GNUC_ATOMICS) +#define atomic_is_lock_free(obj) \ + __atomic_is_lock_free(sizeof((obj)->__val), &(obj)->__val) +#else +#define atomic_is_lock_free(obj) \ + ((void)(obj), sizeof((obj)->__val) <= sizeof(void *)) +#endif +/* + * 7.17.6 Atomic integer types. + */ +#ifndef __CLANG_ATOMICS +/* + * No native support for _Atomic(). Place object in structure to prevent + * most forms of direct non-atomic access. + */ +#define _Atomic(T) \ + struct \ + { \ + T volatile __val; \ + } +#endif +typedef _Atomic(bool) atomic_bool; +typedef _Atomic(char) atomic_char; +typedef _Atomic(signed char) atomic_schar; +typedef _Atomic(unsigned char) atomic_uchar; +typedef _Atomic(short) atomic_short; +typedef _Atomic(unsigned short) atomic_ushort; +typedef _Atomic(int) atomic_int; +typedef _Atomic(unsigned int) atomic_uint; +typedef _Atomic(long) atomic_long; +typedef _Atomic(unsigned long) atomic_ulong; +typedef _Atomic(long long) atomic_llong; +typedef _Atomic(unsigned long long) atomic_ullong; +#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L +typedef _Atomic(char16_t) atomic_char16_t; +typedef _Atomic(char32_t) atomic_char32_t; +#endif +typedef _Atomic(wchar_t) atomic_wchar_t; +typedef _Atomic(int_least8_t) atomic_int_least8_t; +typedef _Atomic(uint_least8_t) atomic_uint_least8_t; +typedef _Atomic(int_least16_t) atomic_int_least16_t; +typedef _Atomic(uint_least16_t) atomic_uint_least16_t; +typedef _Atomic(int_least32_t) atomic_int_least32_t; +typedef _Atomic(uint_least32_t) atomic_uint_least32_t; +typedef _Atomic(int_least64_t) atomic_int_least64_t; +typedef _Atomic(uint_least64_t) atomic_uint_least64_t; +typedef _Atomic(int_fast8_t) atomic_int_fast8_t; +typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; +typedef _Atomic(int_fast16_t) atomic_int_fast16_t; +typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; +typedef _Atomic(int_fast32_t) atomic_int_fast32_t; +typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; +typedef _Atomic(int_fast64_t) atomic_int_fast64_t; +typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; +typedef _Atomic(intptr_t) atomic_intptr_t; +typedef _Atomic(uintptr_t) atomic_uintptr_t; +typedef _Atomic(size_t) atomic_size_t; +typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; +typedef _Atomic(intmax_t) atomic_intmax_t; +typedef _Atomic(uintmax_t) atomic_uintmax_t; +/* + * 7.17.7 Operations on atomic types. + */ +/* + * Compiler-specific operations. + */ +#if defined(__CLANG_ATOMICS) +#define atomic_compare_exchange_strong_explicit(object, expected, \ + desired, success, failure) \ + __c11_atomic_compare_exchange_strong(object, expected, desired, \ + success, failure) +#define atomic_compare_exchange_weak_explicit(object, expected, \ + desired, success, failure) \ + __c11_atomic_compare_exchange_weak(object, expected, desired, \ + success, failure) +#define atomic_exchange_explicit(object, desired, order) \ + __c11_atomic_exchange(object, desired, order) +#define atomic_fetch_add_explicit(object, operand, order) \ + __c11_atomic_fetch_add(object, operand, order) +#define atomic_fetch_and_explicit(object, operand, order) \ + __c11_atomic_fetch_and(object, operand, order) +#define atomic_fetch_or_explicit(object, operand, order) \ + __c11_atomic_fetch_or(object, operand, order) +#define atomic_fetch_sub_explicit(object, operand, order) \ + __c11_atomic_fetch_sub(object, operand, order) +#define atomic_fetch_xor_explicit(object, operand, order) \ + __c11_atomic_fetch_xor(object, operand, order) +#define atomic_load_explicit(object, order) \ + __c11_atomic_load(object, order) +#define atomic_store_explicit(object, desired, order) \ + __c11_atomic_store(object, desired, order) +#elif defined(__GNUC_ATOMICS) +#define atomic_compare_exchange_strong_explicit(object, expected, \ + desired, success, failure) \ + __atomic_compare_exchange_n(&(object)->__val, expected, \ + desired, 0, success, failure) +#define atomic_compare_exchange_weak_explicit(object, expected, \ + desired, success, failure) \ + __atomic_compare_exchange_n(&(object)->__val, expected, \ + desired, 1, success, failure) +#define atomic_exchange_explicit(object, desired, order) \ + __atomic_exchange_n(&(object)->__val, desired, order) +#define atomic_fetch_add_explicit(object, operand, order) \ + __atomic_fetch_add(&(object)->__val, operand, order) +#define atomic_fetch_and_explicit(object, operand, order) \ + __atomic_fetch_and(&(object)->__val, operand, order) +#define atomic_fetch_or_explicit(object, operand, order) \ + __atomic_fetch_or(&(object)->__val, operand, order) +#define atomic_fetch_sub_explicit(object, operand, order) \ + __atomic_fetch_sub(&(object)->__val, operand, order) +#define atomic_fetch_xor_explicit(object, operand, order) \ + __atomic_fetch_xor(&(object)->__val, operand, order) +#define atomic_load_explicit(object, order) \ + __atomic_load_n(&(object)->__val, order) +#define atomic_store_explicit(object, desired, order) \ + __atomic_store_n(&(object)->__val, desired, order) +#else +#define __atomic_apply_stride(object, operand) \ + (((__typeof__((object)->__val))0) + (operand)) +#define atomic_compare_exchange_strong_explicit(object, expected, \ + desired, success, failure) __extension__({ \ + __typeof__(expected) __ep = (expected); \ + __typeof__(*__ep) __e = *__ep; \ + (void)(success); \ + (void)(failure); \ + (bool)((*__ep = __sync_val_compare_and_swap(&(object)->__val, \ + __e, desired)) == __e); \ +}) +#define atomic_compare_exchange_weak_explicit(object, expected, \ + desired, success, failure) \ + atomic_compare_exchange_strong_explicit(object, expected, \ + desired, success, failure) +#ifdef __HAS_BUILTIN_SYNC_SWAP +/* Clang provides a full-barrier atomic exchange - use it if available. */ +#define atomic_exchange_explicit(object, desired, order) \ + ((void)(order), __sync_swap(&(object)->__val, desired)) +#else +/* + * __sync_lock_test_and_set() is only an acquire barrier in theory (although in + * practice it is usually a full barrier) so we need an explicit barrier before + * it. + */ +#define atomic_exchange_explicit(object, desired, order) \ + __extension__({ \ + __typeof__(object) __o = (object); \ + __typeof__(desired) __d = (desired); \ + (void)(order); \ + __sync_synchronize(); \ + __sync_lock_test_and_set(&(__o)->__val, __d); \ + }) +#endif +#define atomic_fetch_add_explicit(object, operand, order) \ + ((void)(order), __sync_fetch_and_add(&(object)->__val, \ + __atomic_apply_stride(object, operand))) +#define atomic_fetch_and_explicit(object, operand, order) \ + ((void)(order), __sync_fetch_and_and(&(object)->__val, operand)) +#define atomic_fetch_or_explicit(object, operand, order) \ + ((void)(order), __sync_fetch_and_or(&(object)->__val, operand)) +#define atomic_fetch_sub_explicit(object, operand, order) \ + ((void)(order), __sync_fetch_and_sub(&(object)->__val, \ + __atomic_apply_stride(object, operand))) +#define atomic_fetch_xor_explicit(object, operand, order) \ + ((void)(order), __sync_fetch_and_xor(&(object)->__val, operand)) +#define atomic_load_explicit(object, order) \ + ((void)(order), __sync_fetch_and_add(&(object)->__val, 0)) +#define atomic_store_explicit(object, desired, order) \ + ((void)atomic_exchange_explicit(object, desired, order)) +#endif +/* + * Convenience functions. + * + * Don't provide these in kernel space. In kernel space, we should be + * disciplined enough to always provide explicit barriers. + */ +#ifndef _KERNEL +#define atomic_compare_exchange_strong(object, expected, desired) \ + atomic_compare_exchange_strong_explicit(object, expected, \ + desired, memory_order_seq_cst, memory_order_seq_cst) +#define atomic_compare_exchange_weak(object, expected, desired) \ + atomic_compare_exchange_weak_explicit(object, expected, \ + desired, memory_order_seq_cst, memory_order_seq_cst) +#define atomic_exchange(object, desired) \ + atomic_exchange_explicit(object, desired, memory_order_seq_cst) +#define atomic_fetch_add(object, operand) \ + atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) +#define atomic_fetch_and(object, operand) \ + atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) +#define atomic_fetch_or(object, operand) \ + atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) +#define atomic_fetch_sub(object, operand) \ + atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) +#define atomic_fetch_xor(object, operand) \ + atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) +#define atomic_load(object) \ + atomic_load_explicit(object, memory_order_seq_cst) +#define atomic_store(object, desired) \ + atomic_store_explicit(object, desired, memory_order_seq_cst) +#endif /* !_KERNEL */ +/* + * 7.17.8 Atomic flag type and operations. + * + * XXX: Assume atomic_bool can be used as an atomic_flag. Is there some + * kind of compiler built-in type we could use? + */ +typedef struct +{ + atomic_bool __flag; +} atomic_flag; +#define ATOMIC_FLAG_INIT \ + { \ + ATOMIC_VAR_INIT(false) \ + } +static __inline bool +atomic_flag_test_and_set_explicit(volatile atomic_flag *__object, + memory_order __order) +{ + return (atomic_exchange_explicit(&__object->__flag, 1, __order)); +} +static __inline void +atomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order) +{ + atomic_store_explicit(&__object->__flag, 0, __order); +} +#ifndef _KERNEL +static __inline bool +atomic_flag_test_and_set(volatile atomic_flag *__object) +{ + return (atomic_flag_test_and_set_explicit(__object, + memory_order_seq_cst)); +} +static __inline void +atomic_flag_clear(volatile atomic_flag *__object) +{ + atomic_flag_clear_explicit(__object, memory_order_seq_cst); +} +#endif /* !_KERNEL */ +#endif /* <atomic> unavailable */ +#endif /* !_STDATOMIC_H_ */ |