| /*- |
| * 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) && __cplusplus >= 201103L && defined(_USING_LIBCXX) |
| # if __has_feature(cxx_atomic) |
| # define _STDATOMIC_HAVE_ATOMIC |
| # 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_is_lock_free; |
| using std::atomic_init; |
| using std::atomic_store; |
| using std::atomic_store_explicit; |
| using std::atomic_load; |
| using std::atomic_load_explicit; |
| using std::atomic_exchange; |
| using std::atomic_exchange_explicit; |
| 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_fetch_add; |
| using std::atomic_fetch_add_explicit; |
| using std::atomic_fetch_sub; |
| using std::atomic_fetch_sub_explicit; |
| using std::atomic_fetch_or; |
| using std::atomic_fetch_or_explicit; |
| using std::atomic_fetch_xor; |
| using std::atomic_fetch_xor_explicit; |
| using std::atomic_fetch_and; |
| using std::atomic_fetch_and_explicit; |
| using std::atomic_thread_fence; |
| using std::atomic_signal_fence; |
| |
| using std::memory_order; |
| using std::memory_order_relaxed; |
| using std::memory_order_consume; |
| using std::memory_order_acquire; |
| using std::memory_order_release; |
| using std::memory_order_acq_rel; |
| using std::memory_order_seq_cst; |
| |
| using std::atomic_bool; |
| using std::atomic_char; |
| using std::atomic_schar; |
| using std::atomic_uchar; |
| using std::atomic_short; |
| using std::atomic_ushort; |
| using std::atomic_int; |
| using std::atomic_uint; |
| using std::atomic_long; |
| using std::atomic_ulong; |
| using std::atomic_llong; |
| using std::atomic_ullong; |
| using std::atomic_char16_t; |
| using std::atomic_char32_t; |
| using std::atomic_wchar_t; |
| using std::atomic_int_least8_t; |
| using std::atomic_uint_least8_t; |
| using std::atomic_int_least16_t; |
| using std::atomic_uint_least16_t; |
| using std::atomic_int_least32_t; |
| using std::atomic_uint_least32_t; |
| using std::atomic_int_least64_t; |
| using std::atomic_uint_least64_t; |
| using std::atomic_int_fast8_t; |
| using std::atomic_uint_fast8_t; |
| using std::atomic_int_fast16_t; |
| using std::atomic_uint_fast16_t; |
| using std::atomic_int_fast32_t; |
| using std::atomic_uint_fast32_t; |
| using std::atomic_int_fast64_t; |
| using std::atomic_uint_fast64_t; |
| using std::atomic_intptr_t; |
| using std::atomic_uintptr_t; |
| using std::atomic_size_t; |
| using std::atomic_ptrdiff_t; |
| using std::atomic_intmax_t; |
| using std::atomic_uintmax_t; |
| |
| #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: don't drag in all the macros, just the types. */ |
| // Include uchar.h only when available. Bionic's stdatomic.h is also used for |
| // the host (via a copy in prebuilts/clang) and uchar.h is not available in the |
| // glibc used for the host. |
| #if defined(__BIONIC__) |
| # include <uchar.h> /* For char16_t and char32_t. */ |
| #endif |
| |
| /* |
| * 7.17.1 Atomic lock-free macros. |
| */ |
| |
| #ifdef __GCC_ATOMIC_BOOL_LOCK_FREE |
| #define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_CHAR_LOCK_FREE |
| #define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
| #define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
| #define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
| #define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_SHORT_LOCK_FREE |
| #define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_INT_LOCK_FREE |
| #define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_LONG_LOCK_FREE |
| #define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_LLONG_LOCK_FREE |
| #define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE |
| #endif |
| #ifdef __GCC_ATOMIC_POINTER_LOCK_FREE |
| #define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE |
| #endif |
| |
| /* |
| * 7.17.2 Initialization. |
| */ |
| |
| #define ATOMIC_VAR_INIT(value) (value) |
| #define atomic_init(obj, value) __c11_atomic_init(obj, value) |
| |
| /* |
| * 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))) { |
| __c11_atomic_thread_fence(__order); |
| } |
| |
| static __inline void atomic_signal_fence(memory_order __order __attribute__((unused))) { |
| __c11_atomic_signal_fence(__order); |
| } |
| |
| /* |
| * 7.17.5 Lock-free property. |
| */ |
| |
| #define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj))) |
| |
| /* |
| * 7.17.6 Atomic integer types. |
| */ |
| |
| 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 defined(__BIONIC__) || (defined(__cplusplus) && __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. |
| */ |
| |
| #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) |
| |
| /* |
| * Convenience functions. |
| */ |
| |
| #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) |
| |
| /* |
| * 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); |
| } |
| |
| 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 /* <atomic> unavailable */ |
| |
| #endif /* !_STDATOMIC_H_ */ |
