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pid_pool.go
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pid_pool.go
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// +build windows
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package windows
import (
"errors"
"sync"
)
type pidPool struct {
sync.Mutex
pool map[uint32]struct{}
cur uint32
}
func newPidPool() *pidPool {
return &pidPool{
pool: make(map[uint32]struct{}),
}
}
func (p *pidPool) Get() (uint32, error) {
p.Lock()
defer p.Unlock()
pid := p.cur + 1
for pid != p.cur {
// 0 is reserved and invalid
if pid == 0 {
pid = 1
}
if _, ok := p.pool[pid]; !ok {
p.cur = pid
p.pool[pid] = struct{}{}
return pid, nil
}
pid++
}
return 0, errors.New("pid pool exhausted")
}
func (p *pidPool) Put(pid uint32) {
p.Lock()
delete(p.pool, pid)
p.Unlock()
}