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// Copyright 2011 The Go Authors.  All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Package atomic provides low-level atomic memory primitives

// useful for implementing synchronization algorithms.

//

// These functions require great care to be used correctly.

// Except for special, low-level applications, synchronization is better

// done with channels or the facilities of the sync package.

// Share memory by communicating;

// don't communicate by sharing memory.

//

// The compare-and-swap operation, implemented by the CompareAndSwapT

// functions, is the atomic equivalent of:

//

//      if *val == old {

//              *val = new

//              return true

//      }

//      return false

//

package atomic

import (

        "unsafe"

)

// BUG(rsc): On ARM, the 64-bit functions use instructions unavailable before ARM 11.

//

// On x86-32, the 64-bit functions use instructions unavailable before the Pentium MMX.

// CompareAndSwapInt32 executes the compare-and-swap operation for an int32 value.

func CompareAndSwapInt32(val *int32, old, new int32) (swapped bool)

// CompareAndSwapInt64 executes the compare-and-swap operation for an int64 value.

func CompareAndSwapInt64(val *int64, old, new int64) (swapped bool)

// CompareAndSwapUint32 executes the compare-and-swap operation for a uint32 value.

func CompareAndSwapUint32(val *uint32, old, new uint32) (swapped bool)

// CompareAndSwapUint64 executes the compare-and-swap operation for a uint64 value.

func CompareAndSwapUint64(val *uint64, old, new uint64) (swapped bool)

// CompareAndSwapUintptr executes the compare-and-swap operation for a uintptr value.

func CompareAndSwapUintptr(val *uintptr, old, new uintptr) (swapped bool)

// CompareAndSwapPointer executes the compare-and-swap operation for a unsafe.Pointer value.

func CompareAndSwapPointer(val *unsafe.Pointer, old, new unsafe.Pointer) (swapped bool)

// AddInt32 atomically adds delta to *val and returns the new value.

func AddInt32(val *int32, delta int32) (new int32)

// AddUint32 atomically adds delta to *val and returns the new value.

func AddUint32(val *uint32, delta uint32) (new uint32)

// AddInt64 atomically adds delta to *val and returns the new value.

func AddInt64(val *int64, delta int64) (new int64)

// AddUint64 atomically adds delta to *val and returns the new value.

func AddUint64(val *uint64, delta uint64) (new uint64)

// AddUintptr atomically adds delta to *val and returns the new value.

func AddUintptr(val *uintptr, delta uintptr) (new uintptr)

// LoadInt32 atomically loads *addr.

func LoadInt32(addr *int32) (val int32)

// LoadInt64 atomically loads *addr.

func LoadInt64(addr *int64) (val int64)

// LoadUint32 atomically loads *addr.

func LoadUint32(addr *uint32) (val uint32)

// LoadUint64 atomically loads *addr.

func LoadUint64(addr *uint64) (val uint64)

// LoadUintptr atomically loads *addr.

func LoadUintptr(addr *uintptr) (val uintptr)

// LoadPointer atomically loads *addr.

func LoadPointer(addr *unsafe.Pointer) (val unsafe.Pointer)

// StoreInt32 atomically stores val into *addr.

func StoreInt32(addr *int32, val int32)

// StoreInt64 atomically stores val into *addr.

func StoreInt64(addr *int64, val int64)

// StoreUint32 atomically stores val into *addr.

func StoreUint32(addr *uint32, val uint32)

// StoreUint64 atomically stores val into *addr.

func StoreUint64(addr *uint64, val uint64)

// StoreUintptr atomically stores val into *addr.

func StoreUintptr(addr *uintptr, val uintptr)

// StorePointer atomically stores val into *addr.

func StorePointer(addr *unsafe.Pointer, val unsafe.Pointer)

// Helper for ARM.  Linker will discard on other systems

func panic64() {

        panic("sync/atomic: broken 64-bit atomic operations (buggy QEMU)")

}