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// -*- C++ -*- header. // Copyright (C) 2008, 2009 // Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/atomic_0.h * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ #ifndef _GLIBCXX_ATOMIC_0_H #define _GLIBCXX_ATOMIC_0_H 1 #pragma GCC system_header // _GLIBCXX_BEGIN_NAMESPACE(std) // 0 == __atomic0 == Never lock-free namespace __atomic0 { struct atomic_flag; // Implementation specific defines. #define _ATOMIC_LOAD_(__a, __x) \ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \ __atomic_flag_base* __g = __atomic_flag_for_address(__p); \ __atomic_flag_wait_explicit(__g, __x); \ __typeof__ _ATOMIC_MEMBER_ __r = *__p; \ atomic_flag_clear_explicit(__g, __x); \ __r; }) #define _ATOMIC_STORE_(__a, __m, __x) \ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \ __typeof__(__m) __v = (__m); \ __atomic_flag_base* __g = __atomic_flag_for_address(__p); \ __atomic_flag_wait_explicit(__g, __x); \ *__p = __v; \ atomic_flag_clear_explicit(__g, __x); \ __v; }) #define _ATOMIC_MODIFY_(__a, __o, __m, __x) \ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \ __typeof__(__m) __v = (__m); \ __atomic_flag_base* __g = __atomic_flag_for_address(__p); \ __atomic_flag_wait_explicit(__g, __x); \ __typeof__ _ATOMIC_MEMBER_ __r = *__p; \ *__p __o __v; \ atomic_flag_clear_explicit(__g, __x); \ __r; }) #define _ATOMIC_CMPEXCHNG_(__a, __e, __m, __x) \ ({__typeof__ _ATOMIC_MEMBER_* __p = &_ATOMIC_MEMBER_; \ __typeof__(__e) __q = (__e); \ __typeof__(__m) __v = (__m); \ bool __r; \ __atomic_flag_base* __g = __atomic_flag_for_address(__p); \ __atomic_flag_wait_explicit(__g, __x); \ __typeof__ _ATOMIC_MEMBER_ __t__ = *__p; \ if (__t__ == *__q) { *__p = __v; __r = true; } \ else { *__q = __t__; __r = false; } \ atomic_flag_clear_explicit(__g, __x); \ __r; }) /// atomic_flag struct atomic_flag : public __atomic_flag_base { atomic_flag() = default; ~atomic_flag() = default; atomic_flag(const atomic_flag&) = delete; atomic_flag& operator=(const atomic_flag&) volatile = delete; // Conversion to ATOMIC_FLAG_INIT. atomic_flag(bool __i): __atomic_flag_base({ __i }) { } bool test_and_set(memory_order __m = memory_order_seq_cst); void clear(memory_order __m = memory_order_seq_cst); }; /// 29.4.2, address types struct atomic_address { private: void* _M_i; public: atomic_address() = default; ~atomic_address() = default; atomic_address(const atomic_address&) = delete; atomic_address& operator=(const atomic_address&) volatile = delete; atomic_address(void* __v) { _M_i = __v; } bool is_lock_free() const { return false; } void store(void* __v, memory_order __m = memory_order_seq_cst) { __glibcxx_assert(__m != memory_order_acquire); __glibcxx_assert(__m != memory_order_acq_rel); __glibcxx_assert(__m != memory_order_consume); _ATOMIC_STORE_(this, __v, __m); } void* load(memory_order __m = memory_order_seq_cst) const { __glibcxx_assert(__m != memory_order_release); __glibcxx_assert(__m != memory_order_acq_rel); return _ATOMIC_LOAD_(this, __m); } void* exchange(void* __v, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, =, __v, __m); } bool compare_exchange_weak(void*& __v1, void* __v2, memory_order __m1, memory_order __m2) { __glibcxx_assert(__m2 != memory_order_release); __glibcxx_assert(__m2 != memory_order_acq_rel); __glibcxx_assert(__m2 <= __m1); return _ATOMIC_CMPEXCHNG_(this, &__v1, __v2, __m1); } bool compare_exchange_weak(void*& __v1, void* __v2, memory_order __m = memory_order_seq_cst) { return compare_exchange_weak(__v1, __v2, __m, __calculate_memory_order(__m)); } bool compare_exchange_strong(void*& __v1, void* __v2, memory_order __m1, memory_order __m2) { __glibcxx_assert(__m2 != memory_order_release); __glibcxx_assert(__m2 != memory_order_acq_rel); __glibcxx_assert(__m2 <= __m1); return _ATOMIC_CMPEXCHNG_(this, &__v1, __v2, __m1); } bool compare_exchange_strong(void*& __v1, void* __v2, memory_order __m = memory_order_seq_cst) { return compare_exchange_strong(__v1, __v2, __m, __calculate_memory_order(__m)); } void* fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) { void** __p = &(_M_i); __atomic_flag_base* __g = __atomic_flag_for_address(__p); __atomic_flag_wait_explicit(__g, __m); void* __r = *__p; *__p = (void*)((char*)(*__p) + __d); atomic_flag_clear_explicit(__g, __m); return __r; } void* fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) { void** __p = &(_M_i); __atomic_flag_base* __g = __atomic_flag_for_address(__p); __atomic_flag_wait_explicit(__g, __m); void* __r = *__p; *__p = (void*)((char*)(*__p) - __d); atomic_flag_clear_explicit(__g, __m); return __r; } operator void*() const { return load(); } void* operator=(void* __v) { store(__v); return __v; } void* operator+=(ptrdiff_t __d) { return fetch_add(__d) + __d; } void* operator-=(ptrdiff_t __d) { return fetch_sub(__d) - __d; } }; // 29.3.1 atomic integral types // For each of the integral types, define atomic_[integral type] struct // // atomic_bool bool // atomic_char char // atomic_schar signed char // atomic_uchar unsigned char // atomic_short short // atomic_ushort unsigned short // atomic_int int // atomic_uint unsigned int // atomic_long long // atomic_ulong unsigned long // atomic_llong long long // atomic_ullong unsigned long long // atomic_char16_t char16_t // atomic_char32_t char32_t // atomic_wchar_t wchar_t // Base type. // NB: Assuming _ITp is an integral scalar type that is 1, 2, 4, or 8 bytes, // since that is what GCC built-in functions for atomic memory access work on. template<typename _ITp> struct __atomic_base { private: typedef _ITp __integral_type; __integral_type _M_i; public: __atomic_base() = default; ~__atomic_base() = default; __atomic_base(const __atomic_base&) = delete; __atomic_base& operator=(const __atomic_base&) volatile = delete; // Requires __integral_type convertible to _M_base._M_i. __atomic_base(__integral_type __i) { _M_i = __i; } operator __integral_type() const { return load(); } __integral_type operator=(__integral_type __i) { store(__i); return __i; } __integral_type operator++(int) { return fetch_add(1); } __integral_type operator--(int) { return fetch_sub(1); } __integral_type operator++() { return fetch_add(1) + 1; } __integral_type operator--() { return fetch_sub(1) - 1; } __integral_type operator+=(__integral_type __i) { return fetch_add(__i) + __i; } __integral_type operator-=(__integral_type __i) { return fetch_sub(__i) - __i; } __integral_type operator&=(__integral_type __i) { return fetch_and(__i) & __i; } __integral_type operator|=(__integral_type __i) { return fetch_or(__i) | __i; } __integral_type operator^=(__integral_type __i) { return fetch_xor(__i) ^ __i; } bool is_lock_free() const { return false; } void store(__integral_type __i, memory_order __m = memory_order_seq_cst) { __glibcxx_assert(__m != memory_order_acquire); __glibcxx_assert(__m != memory_order_acq_rel); __glibcxx_assert(__m != memory_order_consume); _ATOMIC_STORE_(this, __i, __m); } __integral_type load(memory_order __m = memory_order_seq_cst) const { __glibcxx_assert(__m != memory_order_release); __glibcxx_assert(__m != memory_order_acq_rel); return _ATOMIC_LOAD_(this, __m); } __integral_type exchange(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, =, __i, __m); } bool compare_exchange_weak(__integral_type& __i1, __integral_type __i2, memory_order __m1, memory_order __m2) { __glibcxx_assert(__m2 != memory_order_release); __glibcxx_assert(__m2 != memory_order_acq_rel); __glibcxx_assert(__m2 <= __m1); return _ATOMIC_CMPEXCHNG_(this, &__i1, __i2, __m1); } bool compare_exchange_weak(__integral_type& __i1, __integral_type __i2, memory_order __m = memory_order_seq_cst) { return compare_exchange_weak(__i1, __i2, __m, __calculate_memory_order(__m)); } bool compare_exchange_strong(__integral_type& __i1, __integral_type __i2, memory_order __m1, memory_order __m2) { __glibcxx_assert(__m2 != memory_order_release); __glibcxx_assert(__m2 != memory_order_acq_rel); __glibcxx_assert(__m2 <= __m1); return _ATOMIC_CMPEXCHNG_(this, &__i1, __i2, __m1); } bool compare_exchange_strong(__integral_type& __i1, __integral_type __i2, memory_order __m = memory_order_seq_cst) { return compare_exchange_strong(__i1, __i2, __m, __calculate_memory_order(__m)); } __integral_type fetch_add(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, +=, __i, __m); } __integral_type fetch_sub(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, -=, __i, __m); } __integral_type fetch_and(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, &=, __i, __m); } __integral_type fetch_or(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, |=, __i, __m); } __integral_type fetch_xor(__integral_type __i, memory_order __m = memory_order_seq_cst) { return _ATOMIC_MODIFY_(this, ^=, __i, __m); } }; /// atomic_bool // NB: No operators or fetch-operations for this type. struct atomic_bool { private: __atomic_base<bool> _M_base; public: atomic_bool() = default; ~atomic_bool() = default; atomic_bool(const atomic_bool&) = delete; atomic_bool& operator=(const atomic_bool&) volatile = delete; atomic_bool(bool __i) : _M_base(__i) { } bool operator=(bool __i) { return _M_base.operator=(__i); } operator bool() const { return _M_base.load(); } bool is_lock_free() const { return _M_base.is_lock_free(); } void store(bool __i, memory_order __m = memory_order_seq_cst) { _M_base.store(__i, __m); } bool load(memory_order __m = memory_order_seq_cst) const { return _M_base.load(__m); } bool exchange(bool __i, memory_order __m = memory_order_seq_cst) { return _M_base.exchange(__i, __m); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) { return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); } bool compare_exchange_weak(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) { return _M_base.compare_exchange_weak(__i1, __i2, __m); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1, memory_order __m2) { return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); } bool compare_exchange_strong(bool& __i1, bool __i2, memory_order __m = memory_order_seq_cst) { return _M_base.compare_exchange_strong(__i1, __i2, __m); } }; #undef _ATOMIC_LOAD_ #undef _ATOMIC_STORE_ #undef _ATOMIC_MODIFY_ #undef _ATOMIC_CMPEXCHNG_ } // namespace __atomic0 // _GLIBCXX_END_NAMESPACE #endif