43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package promise
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// Mutable is a variable that is initially not set and can be set one
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// or more times (unlike a traditional "promise", which can be written
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// only once).
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type Mutable interface {
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// Set writes a value into this variable and unblocks every
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// goroutine waiting for this variable to have a value
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Set(interface{})
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// Get reads the value of this variable. If this variable is
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// not set yet then this call blocks until this variable gets a value.
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Get() interface{}
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}
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// LockingMutable is a Mutable whose implementation is protected by a lock
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type LockingMutable interface {
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Mutable
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// SetLocked is like Set but the caller must already hold the lock
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SetLocked(interface{})
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// GetLocked is like Get but the caller must already hold the lock
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GetLocked() interface{}
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}
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