mirror of https://github.com/k3s-io/k3s
34 lines
1.4 KiB
Go
34 lines
1.4 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 counter
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// GoRoutineCounter keeps track of the number of active goroutines
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// working on/for something. This is a utility that makes such code more
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// testable. The code uses this utility to report the number of active
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// goroutines to the test code, so that the test code can advance a fake
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// clock when and only when the code being tested has finished all
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// the work that is ready to do at the present time.
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type GoRoutineCounter interface {
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// Add adds the given delta to the count of active goroutines.
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// Call Add(1) before forking a goroutine, Add(-1) at the end of that goroutine.
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// Call Add(-1) just before waiting on something from another goroutine (e.g.,
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// just before a `select`).
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// Call Add(1) just before doing something that unblocks a goroutine that is
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// waiting on that something.
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Add(delta int)
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}
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