209 lines
8.1 KiB
C++
209 lines
8.1 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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// ------------------------------------------------------
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// Atomically increment a value; returns the incremented result.
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static inline uintptr_t mi_atomic_increment(volatile uintptr_t* p);
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// Atomically increment a value; returns the incremented result.
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static inline uint32_t mi_atomic_increment32(volatile uint32_t* p);
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// Atomically decrement a value; returns the decremented result.
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static inline uintptr_t mi_atomic_decrement(volatile uintptr_t* p);
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// Atomically add a 64-bit value; returns the added result.
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static inline int64_t mi_atomic_add(volatile int64_t* p, int64_t add);
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// Atomically subtract a value; returns the subtracted result.
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static inline uintptr_t mi_atomic_subtract(volatile uintptr_t* p, uintptr_t sub);
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// Atomically subtract a value; returns the subtracted result.
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static inline uint32_t mi_atomic_subtract32(volatile uint32_t* p, uint32_t sub);
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// Atomically compare and exchange a value; returns `true` if successful.
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static inline bool mi_atomic_compare_exchange32(volatile uint32_t* p, uint32_t exchange, uint32_t compare);
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// Atomically compare and exchange a value; returns `true` if successful.
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static inline bool mi_atomic_compare_exchange(volatile uintptr_t* p, uintptr_t exchange, uintptr_t compare);
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// Atomically exchange a value.
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static inline uintptr_t mi_atomic_exchange(volatile uintptr_t* p, uintptr_t exchange);
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// Atomically read a value
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static inline uintptr_t mi_atomic_read(volatile uintptr_t* p);
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// Atomically read a pointer
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static inline void* mi_atomic_read_ptr(volatile void** p);
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// Atomically write a value
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static inline void mi_atomic_write(volatile uintptr_t* p, uintptr_t x);
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static inline void mi_atomic_yield(void);
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// Atomically compare and exchange a pointer; returns `true` if successful.
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static inline bool mi_atomic_compare_exchange_ptr(volatile void** p, void* newp, void* compare) {
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return mi_atomic_compare_exchange((volatile uintptr_t*)p, (uintptr_t)newp, (uintptr_t)compare);
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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 void** p, void* exchange) {
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return (void*)mi_atomic_exchange((volatile 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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#if (MI_INTPTR_SIZE==8)
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typedef LONG64 msc_intptr_t;
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#define RC64(f) f##64
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#else
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typedef LONG msc_intptr_t;
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#define RC64(f) f
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#endif
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static inline uintptr_t mi_atomic_increment(volatile uintptr_t* p) {
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return (uintptr_t)RC64(_InterlockedIncrement)((volatile msc_intptr_t*)p);
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}
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static inline uint32_t mi_atomic_increment32(volatile uint32_t* p) {
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return (uint32_t)_InterlockedIncrement((volatile LONG*)p);
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}
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static inline uintptr_t mi_atomic_decrement(volatile uintptr_t* p) {
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return (uintptr_t)RC64(_InterlockedDecrement)((volatile msc_intptr_t*)p);
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}
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static inline uintptr_t mi_atomic_subtract(volatile uintptr_t* p, uintptr_t sub) {
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return (uintptr_t)RC64(_InterlockedExchangeAdd)((volatile msc_intptr_t*)p, -((msc_intptr_t)sub)) - sub;
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}
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static inline uint32_t mi_atomic_subtract32(volatile uint32_t* p, uint32_t sub) {
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return (uint32_t)_InterlockedExchangeAdd((volatile LONG*)p, -((LONG)sub)) - sub;
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}
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static inline bool mi_atomic_compare_exchange32(volatile uint32_t* p, uint32_t exchange, uint32_t compare) {
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return ((int32_t)compare == _InterlockedCompareExchange((volatile LONG*)p, (LONG)exchange, (LONG)compare));
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}
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static inline bool mi_atomic_compare_exchange(volatile uintptr_t* p, uintptr_t exchange, uintptr_t compare) {
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return (compare == RC64(_InterlockedCompareExchange)((volatile msc_intptr_t*)p, (msc_intptr_t)exchange, (msc_intptr_t)compare));
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}
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static inline uintptr_t mi_atomic_exchange(volatile uintptr_t* p, uintptr_t exchange) {
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return (uintptr_t)RC64(_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 uintptr_t* p) {
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return *p;
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}
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static inline void* mi_atomic_read_ptr(volatile void** p) {
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return (void*)(*p);
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}
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static inline void mi_atomic_write(volatile uintptr_t* p, uintptr_t x) {
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*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 int64_t mi_atomic_add(volatile int64_t* p, int64_t add) {
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#if (MI_INTPTR_SIZE==8)
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return _InterlockedExchangeAdd64(p, add) + 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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return sum;
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#endif
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}
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#else
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#ifdef __cplusplus
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#include <atomic>
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#define MI_USING_STD using namespace std;
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#define _Atomic(tp) atomic<tp>
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#else
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#include <stdatomic.h>
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#define MI_USING_STD
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#endif
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static inline uintptr_t mi_atomic_increment(volatile uintptr_t* p) {
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MI_USING_STD
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return atomic_fetch_add_explicit((volatile atomic_uintptr_t*)p, (uintptr_t)1, memory_order_relaxed) + 1;
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}
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static inline uint32_t mi_atomic_increment32(volatile uint32_t* p) {
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MI_USING_STD
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return atomic_fetch_add_explicit((volatile _Atomic(uint32_t)*)p, (uint32_t)1, memory_order_relaxed) + 1;
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}
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static inline uintptr_t mi_atomic_decrement(volatile uintptr_t* p) {
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MI_USING_STD
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return atomic_fetch_sub_explicit((volatile atomic_uintptr_t*)p, (uintptr_t)1, memory_order_relaxed) - 1;
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}
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static inline int64_t mi_atomic_add(volatile int64_t* p, int64_t add) {
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MI_USING_STD
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return atomic_fetch_add_explicit((volatile _Atomic(int64_t)*)p, add, memory_order_relaxed) + add;
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}
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static inline uintptr_t mi_atomic_subtract(volatile uintptr_t* p, uintptr_t sub) {
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MI_USING_STD
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return atomic_fetch_sub_explicit((volatile atomic_uintptr_t*)p, sub, memory_order_relaxed) - sub;
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}
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static inline uint32_t mi_atomic_subtract32(volatile uint32_t* p, uint32_t sub) {
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MI_USING_STD
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return atomic_fetch_sub_explicit((volatile _Atomic(uint32_t)*)p, sub, memory_order_relaxed) - sub;
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}
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static inline bool mi_atomic_compare_exchange32(volatile uint32_t* p, uint32_t exchange, uint32_t compare) {
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MI_USING_STD
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return atomic_compare_exchange_weak_explicit((volatile _Atomic(uint32_t)*)p, &compare, exchange, memory_order_release, memory_order_relaxed);
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}
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static inline bool mi_atomic_compare_exchange(volatile uintptr_t* p, uintptr_t exchange, uintptr_t compare) {
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MI_USING_STD
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return atomic_compare_exchange_weak_explicit((volatile atomic_uintptr_t*)p, &compare, exchange, memory_order_release, memory_order_relaxed);
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}
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static inline uintptr_t mi_atomic_exchange(volatile uintptr_t* p, uintptr_t exchange) {
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MI_USING_STD
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return atomic_exchange_explicit((volatile atomic_uintptr_t*)p, exchange, memory_order_acquire);
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}
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static inline uintptr_t mi_atomic_read(volatile 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 void* mi_atomic_read_ptr(volatile void** p) {
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MI_USING_STD
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return atomic_load_explicit((volatile _Atomic(void*)*)p, memory_order_relaxed);
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}
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static inline void mi_atomic_write(volatile uintptr_t* p, uintptr_t x) {
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MI_USING_STD
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return atomic_store_explicit((volatile atomic_uintptr_t*)p, x, memory_order_relaxed);
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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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#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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