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Diffstat (limited to 'src/sync/atomic/type.go')
-rw-r--r-- | src/sync/atomic/type.go | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/sync/atomic/type.go b/src/sync/atomic/type.go new file mode 100644 index 0000000..179fa93 --- /dev/null +++ b/src/sync/atomic/type.go @@ -0,0 +1,200 @@ +// Copyright 2022 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 + +import "unsafe" + +// A Bool is an atomic boolean value. +// The zero value is false. +type Bool struct { + _ noCopy + v uint32 +} + +// Load atomically loads and returns the value stored in x. +func (x *Bool) Load() bool { return LoadUint32(&x.v) != 0 } + +// Store atomically stores val into x. +func (x *Bool) Store(val bool) { StoreUint32(&x.v, b32(val)) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Bool) Swap(new bool) (old bool) { return SwapUint32(&x.v, b32(new)) != 0 } + +// CompareAndSwap executes the compare-and-swap operation for the boolean value x. +func (x *Bool) CompareAndSwap(old, new bool) (swapped bool) { + return CompareAndSwapUint32(&x.v, b32(old), b32(new)) +} + +// b32 returns a uint32 0 or 1 representing b. +func b32(b bool) uint32 { + if b { + return 1 + } + return 0 +} + +// For testing *Pointer[T]'s methods can be inlined. +// Keep in sync with cmd/compile/internal/test/inl_test.go:TestIntendedInlining. +var _ = &Pointer[int]{} + +// A Pointer is an atomic pointer of type *T. The zero value is a nil *T. +type Pointer[T any] struct { + // Mention *T in a field to disallow conversion between Pointer types. + // See go.dev/issue/56603 for more details. + // Use *T, not T, to avoid spurious recursive type definition errors. + _ [0]*T + + _ noCopy + v unsafe.Pointer +} + +// Load atomically loads and returns the value stored in x. +func (x *Pointer[T]) Load() *T { return (*T)(LoadPointer(&x.v)) } + +// Store atomically stores val into x. +func (x *Pointer[T]) Store(val *T) { StorePointer(&x.v, unsafe.Pointer(val)) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Pointer[T]) Swap(new *T) (old *T) { return (*T)(SwapPointer(&x.v, unsafe.Pointer(new))) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Pointer[T]) CompareAndSwap(old, new *T) (swapped bool) { + return CompareAndSwapPointer(&x.v, unsafe.Pointer(old), unsafe.Pointer(new)) +} + +// An Int32 is an atomic int32. The zero value is zero. +type Int32 struct { + _ noCopy + v int32 +} + +// Load atomically loads and returns the value stored in x. +func (x *Int32) Load() int32 { return LoadInt32(&x.v) } + +// Store atomically stores val into x. +func (x *Int32) Store(val int32) { StoreInt32(&x.v, val) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Int32) Swap(new int32) (old int32) { return SwapInt32(&x.v, new) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Int32) CompareAndSwap(old, new int32) (swapped bool) { + return CompareAndSwapInt32(&x.v, old, new) +} + +// Add atomically adds delta to x and returns the new value. +func (x *Int32) Add(delta int32) (new int32) { return AddInt32(&x.v, delta) } + +// An Int64 is an atomic int64. The zero value is zero. +type Int64 struct { + _ noCopy + _ align64 + v int64 +} + +// Load atomically loads and returns the value stored in x. +func (x *Int64) Load() int64 { return LoadInt64(&x.v) } + +// Store atomically stores val into x. +func (x *Int64) Store(val int64) { StoreInt64(&x.v, val) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Int64) Swap(new int64) (old int64) { return SwapInt64(&x.v, new) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Int64) CompareAndSwap(old, new int64) (swapped bool) { + return CompareAndSwapInt64(&x.v, old, new) +} + +// Add atomically adds delta to x and returns the new value. +func (x *Int64) Add(delta int64) (new int64) { return AddInt64(&x.v, delta) } + +// A Uint32 is an atomic uint32. The zero value is zero. +type Uint32 struct { + _ noCopy + v uint32 +} + +// Load atomically loads and returns the value stored in x. +func (x *Uint32) Load() uint32 { return LoadUint32(&x.v) } + +// Store atomically stores val into x. +func (x *Uint32) Store(val uint32) { StoreUint32(&x.v, val) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Uint32) Swap(new uint32) (old uint32) { return SwapUint32(&x.v, new) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Uint32) CompareAndSwap(old, new uint32) (swapped bool) { + return CompareAndSwapUint32(&x.v, old, new) +} + +// Add atomically adds delta to x and returns the new value. +func (x *Uint32) Add(delta uint32) (new uint32) { return AddUint32(&x.v, delta) } + +// A Uint64 is an atomic uint64. The zero value is zero. +type Uint64 struct { + _ noCopy + _ align64 + v uint64 +} + +// Load atomically loads and returns the value stored in x. +func (x *Uint64) Load() uint64 { return LoadUint64(&x.v) } + +// Store atomically stores val into x. +func (x *Uint64) Store(val uint64) { StoreUint64(&x.v, val) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Uint64) Swap(new uint64) (old uint64) { return SwapUint64(&x.v, new) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Uint64) CompareAndSwap(old, new uint64) (swapped bool) { + return CompareAndSwapUint64(&x.v, old, new) +} + +// Add atomically adds delta to x and returns the new value. +func (x *Uint64) Add(delta uint64) (new uint64) { return AddUint64(&x.v, delta) } + +// A Uintptr is an atomic uintptr. The zero value is zero. +type Uintptr struct { + _ noCopy + v uintptr +} + +// Load atomically loads and returns the value stored in x. +func (x *Uintptr) Load() uintptr { return LoadUintptr(&x.v) } + +// Store atomically stores val into x. +func (x *Uintptr) Store(val uintptr) { StoreUintptr(&x.v, val) } + +// Swap atomically stores new into x and returns the previous value. +func (x *Uintptr) Swap(new uintptr) (old uintptr) { return SwapUintptr(&x.v, new) } + +// CompareAndSwap executes the compare-and-swap operation for x. +func (x *Uintptr) CompareAndSwap(old, new uintptr) (swapped bool) { + return CompareAndSwapUintptr(&x.v, old, new) +} + +// Add atomically adds delta to x and returns the new value. +func (x *Uintptr) Add(delta uintptr) (new uintptr) { return AddUintptr(&x.v, delta) } + +// noCopy may be added to structs which must not be copied +// after the first use. +// +// See https://golang.org/issues/8005#issuecomment-190753527 +// for details. +// +// Note that it must not be embedded, due to the Lock and Unlock methods. +type noCopy struct{} + +// Lock is a no-op used by -copylocks checker from `go vet`. +func (*noCopy) Lock() {} +func (*noCopy) Unlock() {} + +// align64 may be added to structs that must be 64-bit aligned. +// This struct is recognized by a special case in the compiler +// and will not work if copied to any other package. +type align64 struct{} |