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thread.go
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thread.go
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// Copyright 2020 Buf Technologies, Inc.
//
// 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 thread
import (
"runtime"
"sync"
)
var (
globalParallelism = runtime.NumCPU()
globalLock sync.RWMutex
)
// Parallelism returns the current parellism.
//
// This defaults to the number of CPUs.
func Parallelism() int {
globalLock.RLock()
parallelism := globalParallelism
globalLock.RUnlock()
return parallelism
}
// SetParallelism sets the parallelism.
//
// If parallelism < 1, this sets the parallelism to 1.
func SetParallelism(parallelism int) {
if parallelism < 1 {
parallelism = 1
}
globalLock.Lock()
globalParallelism = parallelism
globalLock.Unlock()
}