mirror of
https://github.com/etcd-io/etcd.git
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48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
// Copyright 2023 The etcd Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package traffic
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func NewConcurrencyLimiter(size int) ConcurrencyLimiter {
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return &concurrencyLimiter{
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ch: make(chan struct{}, size),
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}
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}
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type ConcurrencyLimiter interface {
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Take() bool
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Return()
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}
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type concurrencyLimiter struct {
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ch chan struct{}
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}
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func (c *concurrencyLimiter) Take() bool {
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select {
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case c.ch <- struct{}{}:
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return true
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default:
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return false
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}
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}
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func (c *concurrencyLimiter) Return() {
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select {
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case _ = <-c.ch:
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default:
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panic("Call to Return() without a successful Take")
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}
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}
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