mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-30 21:45:27 +00:00
370 lines
13 KiB
C
370 lines
13 KiB
C
/*
|
|
* An implementation of C11 stdatomic.h directly borrowed from FreeBSD
|
|
* (original copyright follows), with minor modifications for
|
|
* portability to other systems. Works for recent Clang (that
|
|
* implement the feature c_atomic) and GCC 4.7+; includes
|
|
* compatibility for GCC below 4.7 but I wouldn't recommend it.
|
|
*
|
|
* Caveats and limitations:
|
|
* - Only the ``_Atomic parentheses'' notation is implemented, while
|
|
* the ``_Atomic space'' one is not.
|
|
* - _Atomic types must be typedef'ed, or programs using them will
|
|
* not type check correctly (incompatible anonymous structure
|
|
* types).
|
|
* - Non-scalar _Atomic types would require runtime support for
|
|
* runtime locking, which, as far as I know, is not currently
|
|
* available on any system.
|
|
*/
|
|
|
|
/*-
|
|
* 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: src/include/stdatomic.h,v 1.10.2.2 2012/05/30 19:21:54 theraven Exp $
|
|
*/
|
|
|
|
#ifndef _STDATOMIC_H_
|
|
#define _STDATOMIC_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#define _Bool bool
|
|
|
|
#if !defined(__has_feature)
|
|
#define __has_feature(x) 0
|
|
#endif
|
|
#if !defined(__has_builtin)
|
|
#define __has_builtin(x) 0
|
|
#endif
|
|
#if !defined(__GNUC_PREREQ__)
|
|
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
|
|
#define __GNUC_PREREQ__(maj, min) \
|
|
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
|
|
#else
|
|
#define __GNUC_PREREQ__(maj, min) 0
|
|
#endif
|
|
#endif
|
|
|
|
#if !defined(__CLANG_ATOMICS) && !defined(__GNUC_ATOMICS)
|
|
#if __has_feature(c_atomic)
|
|
#define __CLANG_ATOMICS
|
|
#elif __GNUC_PREREQ__(4, 7)
|
|
#define __GNUC_ATOMICS
|
|
#elif !defined(__GNUC__)
|
|
#error "stdatomic.h does not support your compiler"
|
|
#endif
|
|
#endif
|
|
|
|
#if !defined(__CLANG_ATOMICS)
|
|
#define _Atomic(T) struct { volatile __typeof__(T) __val; }
|
|
#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
|
|
#define ATOMIC_VAR_INIT(value) { .__val = (value) }
|
|
#define atomic_init(obj, value) do { \
|
|
(obj)->__val = (value); \
|
|
} while (0)
|
|
#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.
|
|
*/
|
|
|
|
enum memory_order {
|
|
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
|
|
};
|
|
|
|
typedef enum memory_order memory_order;
|
|
|
|
/*
|
|
* 7.17.4 Fences.
|
|
*/
|
|
|
|
#ifdef __CLANG_ATOMICS
|
|
#define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
|
|
#define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
|
|
#elif defined(__GNUC_ATOMICS)
|
|
#define atomic_thread_fence(order) __atomic_thread_fence(order)
|
|
#define atomic_signal_fence(order) __atomic_signal_fence(order)
|
|
#else
|
|
#define atomic_thread_fence(order) __sync_synchronize()
|
|
#define atomic_signal_fence(order) __asm volatile ("" : : : "memory")
|
|
#endif
|
|
|
|
/*
|
|
* 7.17.5 Lock-free property.
|
|
*/
|
|
|
|
#if 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))
|
|
#else
|
|
#define atomic_is_lock_free(obj) \
|
|
(sizeof((obj)->__val) <= sizeof(void *))
|
|
#endif
|
|
|
|
/*
|
|
* 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 0
|
|
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_compare_exchange_strong_explicit(object, expected, \
|
|
desired, success, failure) ({ \
|
|
__typeof__((object)->__val) __v; \
|
|
_Bool __r; \
|
|
__v = __sync_val_compare_and_swap(&(object)->__val, \
|
|
*(expected), desired); \
|
|
__r = *(expected) == __v; \
|
|
*(expected) = __v; \
|
|
__r; \
|
|
})
|
|
|
|
#define atomic_compare_exchange_weak_explicit(object, expected, \
|
|
desired, success, failure) \
|
|
atomic_compare_exchange_strong_explicit(object, expected, \
|
|
desired, success, failure)
|
|
#if __has_builtin(__sync_swap)
|
|
/* Clang provides a full-barrier atomic exchange - use it if available. */
|
|
#define atomic_exchange_explicit(object, desired, 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 after
|
|
* it.
|
|
*/
|
|
#define atomic_exchange_explicit(object, desired, order) ({ \
|
|
__typeof__((object)->__val) __v; \
|
|
__v = __sync_lock_test_and_set(&(object)->__val, desired); \
|
|
__sync_synchronize(); \
|
|
__v; \
|
|
})
|
|
#endif
|
|
#define atomic_fetch_add_explicit(object, operand, order) \
|
|
__sync_fetch_and_add(&(object)->__val, operand)
|
|
#define atomic_fetch_and_explicit(object, operand, order) \
|
|
__sync_fetch_and_and(&(object)->__val, operand)
|
|
#define atomic_fetch_or_explicit(object, operand, order) \
|
|
__sync_fetch_and_or(&(object)->__val, operand)
|
|
#define atomic_fetch_sub_explicit(object, operand, order) \
|
|
__sync_fetch_and_sub(&(object)->__val, operand)
|
|
#define atomic_fetch_xor_explicit(object, operand, order) \
|
|
__sync_fetch_and_xor(&(object)->__val, operand)
|
|
#define atomic_load_explicit(object, order) \
|
|
__sync_fetch_and_add(&(object)->__val, 0)
|
|
#define atomic_store_explicit(object, desired, order) do { \
|
|
__sync_synchronize(); \
|
|
(object)->__val = (desired); \
|
|
__sync_synchronize(); \
|
|
} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
typedef atomic_bool atomic_flag;
|
|
|
|
#define ATOMIC_FLAG_INIT ATOMIC_VAR_INIT(0)
|
|
|
|
#define atomic_flag_clear_explicit(object, order) \
|
|
atomic_store_explicit(object, 0, order)
|
|
#define atomic_flag_test_and_set_explicit(object, order) \
|
|
atomic_compare_exchange_strong_explicit(object, 0, 1, order, order)
|
|
|
|
#define atomic_flag_clear(object) \
|
|
atomic_flag_clear_explicit(object, memory_order_seq_cst)
|
|
#define atomic_flag_test_and_set(object) \
|
|
atomic_flag_test_and_set_explicit(object, memory_order_seq_cst)
|
|
|
|
#endif /* !_STDATOMIC_H_ */ |