257 lines
10 KiB
C++
257 lines
10 KiB
C++
/* ----------------------------------------------------------------------------
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Copyright (c) 2018, Microsoft Research, Daan Leijen
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This is free software; you can redistribute it and/or modify it under the
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terms of the MIT license. A copy of the license can be found in the file
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"LICENSE" at the root of this distribution.
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-----------------------------------------------------------------------------*/
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#pragma once
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#ifndef MIMALLOC_ATOMIC_H
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#define MIMALLOC_ATOMIC_H
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// ------------------------------------------------------
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// Atomics
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// We need to be portable between C, C++, and MSVC.
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// ------------------------------------------------------
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#if defined(_MSC_VER)
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#define _Atomic(tp) tp
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#define ATOMIC_VAR_INIT(x) x
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#elif defined(__cplusplus)
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#include <atomic>
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#define _Atomic(tp) std::atomic<tp>
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#else
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#include <stdatomic.h>
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#endif
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#define mi_atomic_cast(tp,x) (volatile _Atomic(tp)*)(x)
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// ------------------------------------------------------
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// Atomic operations specialized for mimalloc
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// ------------------------------------------------------
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// Atomically add a 64-bit value; returns the previous value.
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// Note: not using _Atomic(int64_t) as it is only used for statistics.
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static inline void mi_atomic_add64(volatile int64_t* p, int64_t add);
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// Atomically add a value; returns the previous value. Memory ordering is relaxed.
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static inline intptr_t mi_atomic_add(volatile _Atomic(intptr_t)* p, intptr_t add);
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// Atomically "and" a value; returns the previous value. Memory ordering is relaxed.
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static inline uintptr_t mi_atomic_and(volatile _Atomic(uintptr_t)* p, uintptr_t x);
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// Atomically "or" a value; returns the previous value. Memory ordering is relaxed.
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static inline uintptr_t mi_atomic_or(volatile _Atomic(uintptr_t)* p, uintptr_t x);
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// Atomically compare and exchange a value; returns `true` if successful.
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// May fail spuriously. Memory ordering as release on success, and relaxed on failure.
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// (Note: expected and desired are in opposite order from atomic_compare_exchange)
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static inline bool mi_atomic_cas_weak(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected);
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// Atomically compare and exchange a value; returns `true` if successful.
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// Memory ordering is acquire-release
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// (Note: expected and desired are in opposite order from atomic_compare_exchange)
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static inline bool mi_atomic_cas_strong(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected);
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// Atomically exchange a value. Memory ordering is acquire-release.
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static inline uintptr_t mi_atomic_exchange(volatile _Atomic(uintptr_t)* p, uintptr_t exchange);
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// Atomically read a value. Memory ordering is relaxed.
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static inline uintptr_t mi_atomic_read_relaxed(const volatile _Atomic(uintptr_t)* p);
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// Atomically read a value. Memory ordering is acquire.
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static inline uintptr_t mi_atomic_read(const volatile _Atomic(uintptr_t)* p);
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// Atomically write a value. Memory ordering is release.
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static inline void mi_atomic_write(volatile _Atomic(uintptr_t)* p, uintptr_t x);
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// Yield
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static inline void mi_atomic_yield(void);
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// Atomically add a value; returns the previous value.
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static inline uintptr_t mi_atomic_addu(volatile _Atomic(uintptr_t)* p, uintptr_t add) {
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return (uintptr_t)mi_atomic_add((volatile _Atomic(intptr_t)*)p, (intptr_t)add);
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}
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// Atomically subtract a value; returns the previous value.
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static inline uintptr_t mi_atomic_subu(volatile _Atomic(uintptr_t)* p, uintptr_t sub) {
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return (uintptr_t)mi_atomic_add((volatile _Atomic(intptr_t)*)p, -((intptr_t)sub));
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}
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// Atomically increment a value; returns the incremented result.
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static inline uintptr_t mi_atomic_increment(volatile _Atomic(uintptr_t)* p) {
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return mi_atomic_addu(p, 1);
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}
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// Atomically decrement a value; returns the decremented result.
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static inline uintptr_t mi_atomic_decrement(volatile _Atomic(uintptr_t)* p) {
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return mi_atomic_subu(p, 1);
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}
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// Atomically read a pointer; Memory order is relaxed.
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static inline void* mi_atomic_read_ptr_relaxed(volatile _Atomic(void*) const * p) {
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return (void*)mi_atomic_read_relaxed((const volatile _Atomic(uintptr_t)*)p);
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}
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// Atomically read a pointer; Memory order is acquire.
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static inline void* mi_atomic_read_ptr(volatile _Atomic(void*) const * p) {
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return (void*)mi_atomic_read((const volatile _Atomic(uintptr_t)*)p);
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}
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// Atomically write a pointer
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static inline void mi_atomic_write_ptr(volatile _Atomic(void*)* p, void* x) {
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mi_atomic_write((volatile _Atomic(uintptr_t)*)p, (uintptr_t)x );
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}
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// Atomically compare and exchange a pointer; returns `true` if successful. May fail spuriously.
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// (Note: expected and desired are in opposite order from atomic_compare_exchange)
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static inline bool mi_atomic_cas_ptr_weak(volatile _Atomic(void*)* p, void* desired, void* expected) {
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return mi_atomic_cas_weak((volatile _Atomic(uintptr_t)*)p, (uintptr_t)desired, (uintptr_t)expected);
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}
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// Atomically compare and exchange a pointer; returns `true` if successful.
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// (Note: expected and desired are in opposite order from atomic_compare_exchange)
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static inline bool mi_atomic_cas_ptr_strong(volatile _Atomic(void*)* p, void* desired, void* expected) {
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return mi_atomic_cas_strong((volatile _Atomic(uintptr_t)*)p, (uintptr_t)desired, (uintptr_t)expected);
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}
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// Atomically exchange a pointer value.
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static inline void* mi_atomic_exchange_ptr(volatile _Atomic(void*)* p, void* exchange) {
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return (void*)mi_atomic_exchange((volatile _Atomic(uintptr_t)*)p, (uintptr_t)exchange);
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}
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#ifdef _MSC_VER
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <intrin.h>
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#ifdef _WIN64
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typedef LONG64 msc_intptr_t;
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#define MI_64(f) f##64
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#else
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typedef LONG msc_intptr_t;
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#define MI_64(f) f
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#endif
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static inline intptr_t mi_atomic_add(volatile _Atomic(intptr_t)* p, intptr_t add) {
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return (intptr_t)MI_64(_InterlockedExchangeAdd)((volatile msc_intptr_t*)p, (msc_intptr_t)add);
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}
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static inline uintptr_t mi_atomic_and(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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return (uintptr_t)MI_64(_InterlockedAnd)((volatile msc_intptr_t*)p, (msc_intptr_t)x);
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}
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static inline uintptr_t mi_atomic_or(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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return (uintptr_t)MI_64(_InterlockedOr)((volatile msc_intptr_t*)p, (msc_intptr_t)x);
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}
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static inline bool mi_atomic_cas_strong(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected) {
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return (expected == (uintptr_t)MI_64(_InterlockedCompareExchange)((volatile msc_intptr_t*)p, (msc_intptr_t)desired, (msc_intptr_t)expected));
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}
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static inline bool mi_atomic_cas_weak(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected) {
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return mi_atomic_cas_strong(p,desired,expected);
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}
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static inline uintptr_t mi_atomic_exchange(volatile _Atomic(uintptr_t)* p, uintptr_t exchange) {
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return (uintptr_t)MI_64(_InterlockedExchange)((volatile msc_intptr_t*)p, (msc_intptr_t)exchange);
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}
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static inline uintptr_t mi_atomic_read(volatile _Atomic(uintptr_t) const* p) {
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return *p;
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}
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static inline uintptr_t mi_atomic_read_relaxed(volatile _Atomic(uintptr_t) const* p) {
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return mi_atomic_read(p);
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}
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static inline void mi_atomic_write(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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mi_atomic_exchange(p,x);
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}
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static inline void mi_atomic_yield(void) {
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YieldProcessor();
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}
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static inline void mi_atomic_add64(volatile _Atomic(int64_t)* p, int64_t add) {
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#ifdef _WIN64
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mi_atomic_add(p,add);
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#else
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int64_t current;
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int64_t sum;
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do {
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current = *p;
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sum = current + add;
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} while (_InterlockedCompareExchange64(p, sum, current) != current);
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#endif
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}
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#else
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#ifdef __cplusplus
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#define MI_USING_STD using namespace std;
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#else
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#define MI_USING_STD
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#endif
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static inline void mi_atomic_add64(volatile int64_t* p, int64_t add) {
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MI_USING_STD
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atomic_fetch_add_explicit((volatile _Atomic(int64_t)*)p, add, memory_order_relaxed);
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}
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static inline intptr_t mi_atomic_add(volatile _Atomic(intptr_t)* p, intptr_t add) {
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MI_USING_STD
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return atomic_fetch_add_explicit(p, add, memory_order_relaxed);
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}
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static inline uintptr_t mi_atomic_and(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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MI_USING_STD
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return atomic_fetch_and_explicit(p, x, memory_order_relaxed);
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}
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static inline uintptr_t mi_atomic_or(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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MI_USING_STD
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return atomic_fetch_or_explicit(p, x, memory_order_relaxed);
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}
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static inline bool mi_atomic_cas_weak(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected) {
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MI_USING_STD
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return atomic_compare_exchange_weak_explicit(p, &expected, desired, memory_order_release, memory_order_relaxed);
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}
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static inline bool mi_atomic_cas_strong(volatile _Atomic(uintptr_t)* p, uintptr_t desired, uintptr_t expected) {
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MI_USING_STD
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return atomic_compare_exchange_strong_explicit(p, &expected, desired, memory_order_acq_rel, memory_order_relaxed);
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}
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static inline uintptr_t mi_atomic_exchange(volatile _Atomic(uintptr_t)* p, uintptr_t exchange) {
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MI_USING_STD
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return atomic_exchange_explicit(p, exchange, memory_order_acq_rel);
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}
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static inline uintptr_t mi_atomic_read_relaxed(const volatile _Atomic(uintptr_t)* p) {
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MI_USING_STD
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return atomic_load_explicit((volatile _Atomic(uintptr_t)*) p, memory_order_relaxed);
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}
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static inline uintptr_t mi_atomic_read(const volatile _Atomic(uintptr_t)* p) {
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MI_USING_STD
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return atomic_load_explicit((volatile _Atomic(uintptr_t)*) p, memory_order_acquire);
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}
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static inline void mi_atomic_write(volatile _Atomic(uintptr_t)* p, uintptr_t x) {
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MI_USING_STD
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return atomic_store_explicit(p, x, memory_order_release);
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}
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#if defined(__cplusplus)
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#include <thread>
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static inline void mi_atomic_yield(void) {
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std::this_thread::yield();
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}
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#elif (defined(__GNUC__) || defined(__clang__)) && \
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(defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))
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#if defined(__x86_64__) || defined(__i386__)
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static inline void mi_atomic_yield(void) {
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asm volatile ("pause" ::: "memory");
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}
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#elif defined(__arm__) || defined(__aarch64__)
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static inline void mi_atomic_yield(void) {
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asm volatile("yield");
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}
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#endif
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#elif defined(__wasi__)
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#include <sched.h>
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static inline void mi_atomic_yield() {
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sched_yield();
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}
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#else
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#include <unistd.h>
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static inline void mi_atomic_yield(void) {
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sleep(0);
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}
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#endif
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#endif
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#endif // __MIMALLOC_ATOMIC_H
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