--- /dev/null
+// -*- 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_2.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _GLIBCXX_ATOMIC_2_H
+#define _GLIBCXX_ATOMIC_2_H 1
+
+#pragma GCC system_header
+
+// _GLIBCXX_BEGIN_NAMESPACE(std)
+
+// 2 == __atomic2 == Always lock-free
+// Assumed:
+// _GLIBCXX_ATOMIC_BUILTINS_1
+// _GLIBCXX_ATOMIC_BUILTINS_2
+// _GLIBCXX_ATOMIC_BUILTINS_4
+// _GLIBCXX_ATOMIC_BUILTINS_8
+namespace __atomic2
+{
+ /// 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&) = 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) volatile
+ {
+ // Redundant synchronize if built-in for lock is a full barrier.
+ if (__m != memory_order_acquire && __m != memory_order_acq_rel)
+ __sync_synchronize();
+ return __sync_lock_test_and_set(&_M_i, 1);
+ }
+
+ void
+ clear(memory_order __m = memory_order_seq_cst) volatile
+ {
+ __glibcxx_assert(__m != memory_order_consume);
+ __glibcxx_assert(__m != memory_order_acquire);
+ __glibcxx_assert(__m != memory_order_acq_rel);
+
+ __sync_lock_release(&_M_i);
+ if (__m != memory_order_acquire && __m != memory_order_acq_rel)
+ __sync_synchronize();
+ }
+ };
+
+
+ /// 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&) = delete;
+
+ atomic_address(void* __v) { _M_i = __v; }
+
+ bool
+ is_lock_free() const volatile
+ { return true; }
+
+ void
+ store(void* __v, memory_order __m = memory_order_seq_cst) volatile
+ {
+ __glibcxx_assert(__m != memory_order_acquire);
+ __glibcxx_assert(__m != memory_order_acq_rel);
+ __glibcxx_assert(__m != memory_order_consume);
+
+ if (__m == memory_order_relaxed)
+ _M_i = __v;
+ else
+ {
+ // write_mem_barrier();
+ _M_i = __v;
+ if (__m == memory_order_seq_cst)
+ __sync_synchronize();
+ }
+ }
+
+ void*
+ load(memory_order __m = memory_order_seq_cst) const volatile
+ {
+ __glibcxx_assert(__m != memory_order_release);
+ __glibcxx_assert(__m != memory_order_acq_rel);
+
+ __sync_synchronize();
+ void* __ret = _M_i;
+ __sync_synchronize();
+ return __ret;
+ }
+
+ void*
+ exchange(void* __v, memory_order __m = memory_order_seq_cst) volatile
+ {
+ // XXX built-in assumes memory_order_acquire.
+ return __sync_lock_test_and_set(&_M_i, __v);
+ }
+
+ bool
+ compare_exchange_weak(void*& __v1, void* __v2, memory_order __m1,
+ memory_order __m2) volatile
+ { return compare_exchange_strong(__v1, __v2, __m1, __m2); }
+
+ bool
+ compare_exchange_weak(void*& __v1, void* __v2,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ 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) volatile
+ {
+ __glibcxx_assert(__m2 != memory_order_release);
+ __glibcxx_assert(__m2 != memory_order_acq_rel);
+ __glibcxx_assert(__m2 <= __m1);
+
+ void* __v1o = __v1;
+ void* __v1n = __sync_val_compare_and_swap(&_M_i, __v1o, __v2);
+
+ // Assume extra stores (of same value) allowed in true case.
+ __v1 = __v1n;
+ return __v1o == __v1n;
+ }
+
+ bool
+ compare_exchange_strong(void*& __v1, void* __v2,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ return compare_exchange_strong(__v1, __v2, __m,
+ __calculate_memory_order(__m));
+ }
+
+ void*
+ fetch_add(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_add(&_M_i, __d); }
+
+ void*
+ fetch_sub(ptrdiff_t __d, memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_sub(&_M_i, __d); }
+
+ operator void*() const volatile
+ { return load(); }
+
+ void*
+ operator=(void* __v) // XXX volatile
+ {
+ store(__v);
+ return __v;
+ }
+
+ void*
+ operator+=(ptrdiff_t __d) volatile
+ { return __sync_add_and_fetch(&_M_i, __d); }
+
+ void*
+ operator-=(ptrdiff_t __d) volatile
+ { return __sync_sub_and_fetch(&_M_i, __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&) = delete;
+
+ // Requires __integral_type convertible to _M_base._M_i.
+ __atomic_base(__integral_type __i) { _M_i = __i; }
+
+ operator __integral_type() const volatile
+ { return load(); }
+
+ __integral_type
+ operator=(__integral_type __i) // XXX volatile
+ {
+ store(__i);
+ return __i;
+ }
+
+ __integral_type
+ operator++(int) volatile
+ { return fetch_add(1); }
+
+ __integral_type
+ operator--(int) volatile
+ { return fetch_sub(1); }
+
+ __integral_type
+ operator++() volatile
+ { return __sync_add_and_fetch(&_M_i, 1); }
+
+ __integral_type
+ operator--() volatile
+ { return __sync_sub_and_fetch(&_M_i, 1); }
+
+ __integral_type
+ operator+=(__integral_type __i) volatile
+ { return __sync_add_and_fetch(&_M_i, __i); }
+
+ __integral_type
+ operator-=(__integral_type __i) volatile
+ { return __sync_sub_and_fetch(&_M_i, __i); }
+
+ __integral_type
+ operator&=(__integral_type __i) volatile
+ { return __sync_and_and_fetch(&_M_i, __i); }
+
+ __integral_type
+ operator|=(__integral_type __i) volatile
+ { return __sync_or_and_fetch(&_M_i, __i); }
+
+ __integral_type
+ operator^=(__integral_type __i) volatile
+ { return __sync_xor_and_fetch(&_M_i, __i); }
+
+ bool
+ is_lock_free() const volatile
+ { return true; }
+
+ void
+ store(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ __glibcxx_assert(__m != memory_order_acquire);
+ __glibcxx_assert(__m != memory_order_acq_rel);
+ __glibcxx_assert(__m != memory_order_consume);
+
+ if (__m == memory_order_relaxed)
+ _M_i = __i;
+ else
+ {
+ // write_mem_barrier();
+ _M_i = __i;
+ if (__m == memory_order_seq_cst)
+ __sync_synchronize();
+ }
+ }
+
+ __integral_type
+ load(memory_order __m = memory_order_seq_cst) const volatile
+ {
+ __glibcxx_assert(__m != memory_order_release);
+ __glibcxx_assert(__m != memory_order_acq_rel);
+
+ __sync_synchronize();
+ __integral_type __ret = _M_i;
+ __sync_synchronize();
+ return __ret;
+ }
+
+ __integral_type
+ exchange(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ // XXX built-in assumes memory_order_acquire.
+ return __sync_lock_test_and_set(&_M_i, __i);
+ }
+
+ bool
+ compare_exchange_weak(__integral_type& __i1, __integral_type __i2,
+ memory_order __m1, memory_order __m2) volatile
+ { return compare_exchange_strong(__i1, __i2, __m1, __m2); }
+
+ bool
+ compare_exchange_weak(__integral_type& __i1, __integral_type __i2,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ 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) volatile
+ {
+ __glibcxx_assert(__m2 != memory_order_release);
+ __glibcxx_assert(__m2 != memory_order_acq_rel);
+ __glibcxx_assert(__m2 <= __m1);
+
+ __integral_type __i1o = __i1;
+ __integral_type __i1n = __sync_val_compare_and_swap(&_M_i, __i1o, __i2);
+
+ // Assume extra stores (of same value) allowed in true case.
+ __i1 = __i1n;
+ return __i1o == __i1n;
+ }
+
+ bool
+ compare_exchange_strong(__integral_type& __i1, __integral_type __i2,
+ memory_order __m = memory_order_seq_cst) volatile
+ {
+ 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) volatile
+ { return __sync_fetch_and_add(&_M_i, __i); }
+
+ __integral_type
+ fetch_sub(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_sub(&_M_i, __i); }
+
+ __integral_type
+ fetch_and(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_and(&_M_i, __i); }
+
+ __integral_type
+ fetch_or(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_or(&_M_i, __i); }
+
+ __integral_type
+ fetch_xor(__integral_type __i,
+ memory_order __m = memory_order_seq_cst) volatile
+ { return __sync_fetch_and_xor(&_M_i, __i); }
+ };
+
+
+ /// 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&) = delete;
+
+ atomic_bool(bool __i) : _M_base(__i) { }
+
+ bool
+ operator=(bool __i) // XXX volatile
+ { return _M_base.operator=(__i); }
+
+ operator bool() const volatile
+ { return _M_base.load(); }
+
+ bool
+ is_lock_free() const volatile
+ { return _M_base.is_lock_free(); }
+
+ void
+ store(bool __i, memory_order __m = memory_order_seq_cst) volatile
+ { _M_base.store(__i, __m); }
+
+ bool
+ load(memory_order __m = memory_order_seq_cst) const volatile
+ { return _M_base.load(__m); }
+
+ bool
+ exchange(bool __i, memory_order __m = memory_order_seq_cst) volatile
+ { return _M_base.exchange(__i, __m); }
+
+ bool
+ compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1,
+ memory_order __m2) volatile
+ { 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) volatile
+ { return _M_base.compare_exchange_weak(__i1, __i2, __m); }
+
+ bool
+ compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1,
+ memory_order __m2) volatile
+ { 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) volatile
+ { return _M_base.compare_exchange_strong(__i1, __i2, __m); }
+ };
+} // namespace __atomic2
+
+// _GLIBCXX_END_NAMESPACE
+
+#endif
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