atomic.hpp (24649B)
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Vyukov * All rights reserved. * This software is provided AS-IS with no warranty, either express or implied. * This software is distributed under a license and may not be copied, * modified or distributed except as expressly authorized under the * terms of the license contained in the file LICENSE.TXT in this distribution. */ #ifndef RL_ATOMIC_HPP #define RL_ATOMIC_HPP #ifdef _MSC_VER # pragma once #endif #include "base.hpp" #include "context.hpp" #include "memory_order.hpp" #include "signature.hpp" #include "atomic_events.hpp" #include "waitset.hpp" #include "rmw.hpp" namespace rl { template<typename T> class atomic; template<bool> struct bool_t {}; template<typename T> class atomic_proxy_const { public: atomic_proxy_const(atomic<T> const /*volatile*/& var, debug_info_param info) : var_(const_cast<atomic<T>&>(var)) , info_(info) { } T load(memory_order mo = mo_seq_cst) const { return var_.load(mo, info_); } operator T () const { return load(); } protected: atomic<T>& var_; debug_info info_; atomic_proxy_const& operator = (atomic_proxy_const const&); }; template<typename T> class atomic_proxy : public atomic_proxy_const<T> { public: typedef typename atomic_add_type<T>::type add_type; atomic_proxy(atomic<T> /*volatile*/& var, debug_info_param info) : atomic_proxy_const<T>(var, info) { } void store(T value, memory_order mo = mo_seq_cst) { this->var_.store(value, mo, this->info_); } bool compare_exchange_weak(T& cmp, T xchg, memory_order mo = mo_seq_cst) { return this->var_.compare_exchange(bool_t<true>(), cmp, xchg, mo, this->info_); } bool compare_exchange_weak(T& cmp, T xchg, memory_order mo, memory_order failure_mo) { return this->var_.compare_exchange(bool_t<true>(), cmp, xchg, mo, failure_mo, this->info_); } bool compare_exchange_strong(T& cmp, T xchg, memory_order mo = mo_seq_cst) { return this->var_.compare_exchange(bool_t<false>(), cmp, xchg, mo, this->info_); } bool compare_exchange_strong(T& cmp, T xchg, memory_order mo, memory_order failure_mo) { return this->var_.compare_exchange(bool_t<false>(), cmp, xchg, mo, failure_mo, this->info_); } T exchange(T xchg, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_swap>(), xchg, mo, this->info_); } T fetch_add(add_type value, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_add>(), value, mo, this->info_); } T fetch_sub(add_type value, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_sub>(), value, mo, this->info_); } T fetch_and(T value, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_and>(), value, mo, this->info_); } T fetch_or(T value, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_or>(), value, mo, this->info_); } T fetch_xor(T value, memory_order mo = mo_seq_cst) { return this->var_.rmw(rmw_type_t<rmw_type_xor>(), value, mo, this->info_); } T operator = (T value) { store(value); return value; } T operator ++ (int) { return fetch_add(1); } T operator -- (int) { return fetch_sub(1); } T operator ++ () { return fetch_add(1) + 1; } T operator -- () { return fetch_sub(1) - 1; } T operator += (add_type value) { return fetch_add(value) + value; } T operator -= (add_type value) { return fetch_sub(value) + value; } T operator &= (T value) { return fetch_and(value) & value; } T operator |= (T value) { return fetch_or(value) | value; } T operator ^= (T value) { return fetch_xor(value) ^ value; } }; template<typename T, bool strong_init> class generic_atomic { public: generic_atomic() { context& c = ctx(); RL_VERIFY(false == c.invariant_executing); impl_ = c.atomic_ctor(this); initialized_ = false; value_ = T(); already_failed_ = false; if (val(strong_init)) { unsigned const index = c.threadx_->atomic_init(impl_); last_index_ = index; initialized_ = true; history_[index] = T(); value_ = T(); } } ~generic_atomic() { context& c = ctx(); RL_VERIFY(false == c.invariant_executing); sign_.check($); c.atomic_dtor(impl_); } T debug_value() const { sign_.check($); return value_; } RL_INLINE T load(memory_order mo, debug_info_param info) const { RL_VERIFY(mo_release != mo); RL_VERIFY(mo_acq_rel != mo); switch (mo) { case mo_relaxed: return load_impl<mo_relaxed, &thread_info_base::atomic_load_relaxed>(info); case mo_consume: return load_impl<mo_consume, &thread_info_base::atomic_load_acquire>(info); case mo_acquire: return load_impl<mo_acquire, &thread_info_base::atomic_load_acquire>(info); case mo_seq_cst: return load_impl<mo_seq_cst, &thread_info_base::atomic_load_seq_cst>(info); default: break; } RL_VERIFY(false); return T(); } RL_INLINE void store(T v, memory_order mo, debug_info_param info) { RL_VERIFY(mo_acquire != mo); RL_VERIFY(mo_acq_rel != mo); switch (mo) { case mo_relaxed: return store_impl<mo_relaxed, &thread_info_base::atomic_store_relaxed>(v, info); case mo_release: return store_impl<mo_release, &thread_info_base::atomic_store_release>(v, info); case mo_seq_cst: return store_impl< mo_seq_cst, &thread_info_base::atomic_store_seq_cst>(v, info); default: break; } RL_VERIFY(false); } RL_INLINE bool compare_exchange_weak(T& cmp, T xchg, memory_order mo, debug_info_param info) { return compare_exchange(bool_t<true>(), cmp, xchg, mo, info); } RL_INLINE bool compare_exchange_strong(T& cmp, T xchg, memory_order mo, debug_info_param info) { return compare_exchange(bool_t<false>(), cmp, xchg, mo, info); } RL_INLINE bool compare_exchange_weak(T& cmp, T xchg, memory_order mo, debug_info_param info, memory_order failure_mo, debug_info_param) { return compare_exchange(bool_t<true>(), cmp, xchg, mo, failure_mo, info); } RL_INLINE bool compare_exchange_strong(T& cmp, T xchg, memory_order mo, debug_info_param info, memory_order failure_mo, debug_info_param) { return compare_exchange(bool_t<false>(), cmp, xchg, mo, failure_mo, info); } template<bool spurious_failures> RL_INLINE bool compare_exchange(bool_t<spurious_failures>, T& cmp, T xchg, memory_order mo, debug_info_param info) { switch (mo) { case mo_relaxed: return compare_swap_impl<spurious_failures, mo_relaxed, &thread_info_base::atomic_rmw_relaxed, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_consume: return compare_swap_impl<spurious_failures, mo_consume, &thread_info_base::atomic_rmw_acquire, mo_consume, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_acquire: return compare_swap_impl<spurious_failures, mo_acquire, &thread_info_base::atomic_rmw_acquire, mo_acquire, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_release: return compare_swap_impl<spurious_failures, mo_release, &thread_info_base::atomic_rmw_release, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_acq_rel: return compare_swap_impl<spurious_failures, mo_acq_rel, &thread_info_base::atomic_rmw_acq_rel, mo_acquire, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_seq_cst: return compare_swap_impl<spurious_failures, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst, mo_seq_cst, &thread_info_base::atomic_load_seq_cst_rmw>(cmp, xchg, info); } RL_VERIFY(false); return false; } template<bool spurious_failures> RL_INLINE bool compare_exchange(bool_t<spurious_failures>, T& cmp, T xchg, memory_order mo, memory_order failure_mo, debug_info_param info) { switch (mo) { case mo_relaxed: { RL_VERIFY(mo_relaxed == failure_mo); return compare_swap_impl<spurious_failures, mo_relaxed, &thread_info_base::atomic_rmw_relaxed, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); } case mo_consume: { RL_VERIFY(mo_relaxed == failure_mo || mo_consume == failure_mo); switch (failure_mo) { case mo_relaxed: return compare_swap_impl<spurious_failures, mo_consume, &thread_info_base::atomic_rmw_acquire, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_consume: return compare_swap_impl<spurious_failures, mo_consume, &thread_info_base::atomic_rmw_acquire, mo_consume, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); default: RL_VERIFY(false); return false; } } case mo_acquire: { RL_VERIFY(mo_relaxed == failure_mo || mo_consume == failure_mo || mo_acquire == failure_mo); switch (failure_mo) { case mo_relaxed: return compare_swap_impl<spurious_failures, mo_acquire, &thread_info_base::atomic_rmw_acquire, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_consume: return compare_swap_impl<spurious_failures, mo_acquire, &thread_info_base::atomic_rmw_acquire, mo_consume, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_acquire: return compare_swap_impl<spurious_failures, mo_acquire, &thread_info_base::atomic_rmw_acquire, mo_acquire, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); default: RL_VERIFY(false); return false; } } case mo_release: { RL_VERIFY(mo_relaxed == failure_mo); return compare_swap_impl<spurious_failures, mo_release, &thread_info_base::atomic_rmw_release, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); } case mo_acq_rel: { RL_VERIFY(mo_relaxed == failure_mo || mo_consume == failure_mo || mo_acquire == failure_mo); switch (failure_mo) { case mo_relaxed: return compare_swap_impl<spurious_failures, mo_acq_rel, &thread_info_base::atomic_rmw_acq_rel, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_consume: return compare_swap_impl<spurious_failures, mo_acq_rel, &thread_info_base::atomic_rmw_acq_rel, mo_consume, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_acquire: return compare_swap_impl<spurious_failures, mo_acq_rel, &thread_info_base::atomic_rmw_acq_rel, mo_acquire, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); default: RL_VERIFY(false); return false; } } case mo_seq_cst: { RL_VERIFY(mo_relaxed == failure_mo || mo_consume == failure_mo || mo_acquire == failure_mo || mo_seq_cst == failure_mo); switch (failure_mo) { case mo_relaxed: return compare_swap_impl<spurious_failures, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst, mo_relaxed, &thread_info_base::atomic_load_relaxed_rmw>(cmp, xchg, info); case mo_consume: return compare_swap_impl<spurious_failures, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst, mo_consume, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_acquire: return compare_swap_impl<spurious_failures, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst, mo_acquire, &thread_info_base::atomic_load_acquire_rmw>(cmp, xchg, info); case mo_seq_cst: return compare_swap_impl<spurious_failures, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst, mo_seq_cst, &thread_info_base::atomic_load_seq_cst_rmw>(cmp, xchg, info); default: RL_VERIFY(false); return false; } } } RL_VERIFY(false); return false; } T exchange(T xchg, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_swap>(), xchg, mo, info); } T fetch_add(typename atomic_add_type<T>::type value, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_add>(), value, mo, info); } T fetch_sub(typename atomic_add_type<T>::type value, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_sub>(), value, mo, info); } T fetch_and(T value, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_and>(), value, mo, info); } T fetch_or(T value, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_or>(), value, mo, info); } T fetch_xor(T value, memory_order mo, debug_info_param info) { return rmw(rmw_type_t<rmw_type_xor>(), value, mo, info); } template<typename Y, rmw_type_e type> RL_INLINE T rmw(rmw_type_t<type>, Y op, memory_order mo, debug_info_param info) { switch (mo) { case mo_relaxed: return rmw_impl<Y, mo_relaxed, &thread_info_base::atomic_rmw_relaxed>(rmw_type_t<type>(), op, info); case mo_consume: return rmw_impl<Y, mo_consume, &thread_info_base::atomic_rmw_acquire>(rmw_type_t<type>(), op, info); case mo_acquire: return rmw_impl<Y, mo_acquire, &thread_info_base::atomic_rmw_acquire>(rmw_type_t<type>(), op, info); case mo_release: return rmw_impl<Y, mo_release, &thread_info_base::atomic_rmw_release>(rmw_type_t<type>(), op, info); case mo_acq_rel: return rmw_impl<Y, mo_acq_rel, &thread_info_base::atomic_rmw_acq_rel>(rmw_type_t<type>(), op, info); case mo_seq_cst: return rmw_impl<Y, mo_seq_cst, &thread_info_base::atomic_rmw_seq_cst>(rmw_type_t<type>(), op, info); } RL_VERIFY(false); return T(); } unpark_reason wait(context& c, bool is_timed, bool allow_spurious_wakeup, debug_info_param info) { sign_.check(info); return c.threadx_->atomic_wait(impl_, is_timed, allow_spurious_wakeup, info); } thread_id_t wake(context& c, thread_id_t count, debug_info_param info) { sign_.check(info); return c.threadx_->atomic_wake(impl_, count, info); } private: T value_; T history_ [atomic_history_size]; atomic_data* impl_; unsigned last_index_; signature<987654321> sign_; bool initialized_; bool already_failed_; template<memory_order mo, unsigned (thread_info_base::*impl)(atomic_data* RL_RESTRICT data)> T load_impl(debug_info_param info) const { context& c = ctx(); c.sched(); sign_.check(info); if (false == c.invariant_executing) { unsigned const index = (c.threadx_->*impl)(impl_); if ((unsigned)-1 == index) { RL_HIST(atomic_load_event<T>) {this, T(), mo, false} RL_HIST_END(); RL_ASSERT_IMPL(false, test_result_unitialized_access, "", info); } T const v = history_[index]; RL_HIST(atomic_load_event<T>) {this, v, mo, last_index_ != index} RL_HIST_END(); return v; } else { if (false == initialized_) { RL_HIST(atomic_load_event<T>) {this, T(), mo, false} RL_HIST_END(); RL_ASSERT_IMPL(false, test_result_unitialized_access, "", info); } return value_; } } template<memory_order mo, unsigned (thread_info_base::*impl)(atomic_data* RL_RESTRICT data)> void store_impl(T v, debug_info_param info) { context& c = ctx(); RL_VERIFY(false == c.invariant_executing); c.sched(); sign_.check(info); unsigned const index = (c.threadx_->*impl)(impl_); T const prev = value_; last_index_ = index; history_[index] = v; value_ = v; initialized_ = true; RL_HIST(atomic_store_event<T>) {this, prev, v, mo} RL_HIST_END(); } template<bool spurious_failures, memory_order mo, unsigned (thread_info_base::*impl)(atomic_data* RL_RESTRICT data, bool&), memory_order failure_mo, unsigned (thread_info_base::*failure_impl)(atomic_data* RL_RESTRICT data)> bool compare_swap_impl(T& cmp, T xchg, debug_info_param info) { context& c = ctx(); RL_VERIFY(false == c.invariant_executing); c.sched(); sign_.check(info); if (false == initialized_) { RL_HIST(atomic_load_event<T>) {this, T(), mo, false} RL_HIST_END(); RL_ASSERT_IMPL(false, test_result_unitialized_access, "", info); } bool success = false; bool spurious_failure = false; bool aba = false; T const cmpv = cmp; T const current = value_; if (current == cmpv) { if (val(spurious_failures)) { if (c.is_random_sched()) { spurious_failure = (0 == c.rand(4, sched_type_cas_fail)); } else { if (false == already_failed_) { spurious_failure = 0 == c.rand(2, sched_type_cas_fail); if (spurious_failure) already_failed_ = true; } } } if (false == spurious_failure) { success = true; unsigned const index = (c.threadx_->*impl)(impl_, aba); value_ = xchg; last_index_ = index; history_[index] = xchg; } } if (false == success) { (c.threadx_->*failure_impl)(impl_); cmp = current; } RL_HIST(atomic_cas_event<T>) {RL_INFO, this, current, cmpv, xchg, mo, success, spurious_failure, aba} RL_HIST_END(); return success; } template<typename Y, memory_order mo, unsigned (thread_info_base::*impl)(atomic_data* RL_RESTRICT data, bool&), rmw_type_e type> T rmw_impl(rmw_type_t<type>, Y op, debug_info_param info) { context& c = ctx(); RL_VERIFY(false == c.invariant_executing); c.sched(); sign_.check(info); if (false == initialized_) { RL_HIST(atomic_load_event<T>) {this, T(), mo, false} RL_HIST_END(); RL_ASSERT_IMPL(false, test_result_unitialized_access, "", info); } bool aba; unsigned const index = (c.threadx_->*impl)(impl_, aba); T const prev_value = value_; T const new_value = perform_rmw(rmw_type_t<type>(), prev_value, op); value_ = new_value; last_index_ = index; history_[index] = new_value; typedef atomic_rmw_event<T, Y> atomic_rmw_event_t; RL_HIST(atomic_rmw_event_t) {RL_INFO, this, prev_value, op, new_value, mo, type} RL_HIST_END(); return prev_value; } RL_NOCOPY(generic_atomic); }; template<typename T> class atomic : public generic_atomic<T, false> { public: atomic() { } /*explicit*/ atomic(T value) { this->store(value, mo_relaxed, $); } atomic_proxy_const<T> operator () (debug_info_param info) const /*volatile*/ { return atomic_proxy_const<T>(*this, info); } atomic_proxy<T> operator () (debug_info_param info) /*volatile*/ { return atomic_proxy<T>(*this, info); } bool is_lock_free() const /*volatile*/ { return true; } friend class atomic_proxy<T>; friend class atomic_proxy_const<T>; RL_NOCOPY(atomic); }; typedef atomic<bool> atomic_bool; typedef atomic<void*> atomic_address; 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; //typedef atomic<char16_t> atomic_char16_t; //typedef atomic<char32_t> atomic_char32_t; 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<ssize_t> atomic_ssize_t; typedef atomic<ptrdiff_t> atomic_ptrdiff_t; //typedef atomic<intmax_t> atomic_intmax_t; //typedef atomic<uintmax_t> atomic_uintmax_t; template<thread_id_t thread_count> struct atomic_data_impl : atomic_data { typedef thread_info<thread_count> thread_info_t; struct history_record { timestamp_t acq_rel_order_ [thread_count]; timestamp_t last_seen_order_ [thread_count]; bool busy_; bool seq_cst_; thread_id_t thread_id_; timestamp_t acq_rel_timestamp_; }; static size_t const history_size = atomic_history_size; aligned<history_record> history_ [history_size]; unsigned current_index_; waitset<thread_count> futex_ws_; sync_var<thread_count> futex_sync_; atomic_data_impl() { current_index_ = 0; history_record& rec = history_[0]; history_[atomic_history_size - 1].busy_ = false; rec.busy_ = false; rec.seq_cst_ = false; rec.thread_id_ = (thread_id_t)-1; } atomic_data_impl(thread_info_t& th) { current_index_ = 0; history_[atomic_history_size - 1].busy_ = false; history_record& rec = history_[0]; rec.busy_ = true; rec.seq_cst_ = false; rec.thread_id_ = th.index_; th.own_acq_rel_order_ += 1; rec.acq_rel_timestamp_ = th.own_acq_rel_order_; foreach<thread_count>(rec.acq_rel_order_, assign_zero); foreach<thread_count>(rec.last_seen_order_, assign<(timestamp_t)-1>); rec.last_seen_order_[th.index_] = th.own_acq_rel_order_; } }; } #endif |