49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
// Copyright 2025 PingCAP, Inc.
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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 backup
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import "sync"
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type ResourceConcurrentLimiter struct {
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cond *sync.Cond
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current int
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threshold int
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}
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func NewResourceMemoryLimiter(threshold int) *ResourceConcurrentLimiter {
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return &ResourceConcurrentLimiter{
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cond: sync.NewCond(new(sync.Mutex)),
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current: 0,
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threshold: threshold,
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}
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}
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func (rcl *ResourceConcurrentLimiter) Acquire(resource int) int {
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rcl.cond.L.Lock()
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defer rcl.cond.L.Unlock()
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for rcl.current >= rcl.threshold {
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rcl.cond.Wait()
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}
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rcl.current += resource
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return rcl.current
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}
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func (rcl *ResourceConcurrentLimiter) Release(resource int) {
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rcl.cond.L.Lock()
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defer rcl.cond.L.Unlock()
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rcl.current -= resource
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rcl.cond.Broadcast()
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}
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