github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/util/syncutil/atomic.go (about)

     1  // Copyright 2017 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package syncutil
    12  
    13  import (
    14  	"math"
    15  	"sync/atomic"
    16  )
    17  
    18  // AtomicFloat64 mimics the atomic types in the sync/atomic standard library,
    19  // but for the float64 type. If you'd like to implement additional methods,
    20  // consider checking out the expvar Float type for guidance:
    21  // https://golang.org/src/expvar/expvar.go?s=2188:2222#L69
    22  type AtomicFloat64 uint64
    23  
    24  // StoreFloat64 atomically stores a float64 value into the provided address.
    25  func StoreFloat64(addr *AtomicFloat64, val float64) {
    26  	atomic.StoreUint64((*uint64)(addr), math.Float64bits(val))
    27  }
    28  
    29  // LoadFloat64 atomically loads tha float64 value from the provided address.
    30  func LoadFloat64(addr *AtomicFloat64) (val float64) {
    31  	return math.Float64frombits(atomic.LoadUint64((*uint64)(addr)))
    32  }