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