191 lines
7.3 KiB
C++
191 lines
7.3 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.txt" 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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static inline void mi_atomic_yield();
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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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#define mi_atomic_locked(mutex) for(bool _mheld = mi_mutex_lock(mutex); _mheld; _mheld = mi_mutex_unlock(mutex))
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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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#define RC64(f) f##64
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#else
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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 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 int32_t*)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 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 intptr_t*)p, -((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 int32_t*)p, -((int32_t)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 int32_t*)p, (int32_t)exchange, (int32_t)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 intptr_t*)p, (intptr_t)exchange, (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 intptr_t*)p, (intptr_t)exchange);
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}
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static inline void mi_atomic_yield() {
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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_relaxed, memory_order_seq_cst);
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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_relaxed, memory_order_seq_cst);
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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_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() {
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std::this_thread::yield();
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}
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#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__x86_64__) || defined(__i386__))
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static inline void mi_atomic_yield() {
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asm volatile ("pause" ::: "memory");
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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() {
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sleep(0);
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}
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#endif
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#endif
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// Light weight mutex for low contention situations
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typedef struct mi_mutex_s {
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volatile uint32_t value;
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} mi_mutex_t;
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static inline bool mi_mutex_lock(mi_mutex_t* mutex) {
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while(!mi_atomic_compare_exchange32(&mutex->value, 1, 0)) {
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mi_atomic_yield();
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}
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return true;
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}
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static inline bool mi_mutex_unlock(mi_mutex_t* mutex) {
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mutex->value = 0;
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return false;
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}
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#endif // __MIMALLOC_ATOMIC_H
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