Source File
float32_ext.go
Belonging Package
go.uber.org/atomic
// Copyright (c) 2020-2022 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package atomic
import (
)
//go:generate bin/gen-atomicwrapper -name=Float32 -type=float32 -wrapped=Uint32 -pack=math.Float32bits -unpack=math.Float32frombits -swap -json -imports math -file=float32.go
// Add atomically adds to the wrapped float32 and returns the new value.
func ( *Float32) ( float32) float32 {
for {
:= .Load()
:= +
if .CAS(, ) {
return
}
}
}
// Sub atomically subtracts from the wrapped float32 and returns the new value.
func ( *Float32) ( float32) float32 {
return .Add(-)
}
// CAS is an atomic compare-and-swap for float32 values.
//
// Deprecated: Use CompareAndSwap
func ( *Float32) (, float32) ( bool) {
return .CompareAndSwap(, )
}
// CompareAndSwap is an atomic compare-and-swap for float32 values.
//
// Note: CompareAndSwap handles NaN incorrectly. NaN != NaN using Go's inbuilt operators
// but CompareAndSwap allows a stored NaN to compare equal to a passed in NaN.
// This avoids typical CompareAndSwap loops from blocking forever, e.g.,
//
// for {
// old := atom.Load()
// new = f(old)
// if atom.CompareAndSwap(old, new) {
// break
// }
// }
//
// If CompareAndSwap did not match NaN to match, then the above would loop forever.
func ( *Float32) (, float32) ( bool) {
return .v.CompareAndSwap(math.Float32bits(), math.Float32bits())
}
// String encodes the wrapped value as a string.
func ( *Float32) () string {
// 'g' is the behavior for floats with %v.
return strconv.FormatFloat(float64(.Load()), 'g', -1, 32)
}
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