github.com/coreos/mantle@v0.13.0/lang/worker/parallel.go (about)

     1  // Copyright 2016 CoreOS, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package worker
    16  
    17  import (
    18  	"golang.org/x/net/context"
    19  )
    20  
    21  // Parallel executes a set of Workers and waits for them to finish.
    22  func Parallel(ctx context.Context, workers ...Worker) error {
    23  	wg := NewWorkerGroup(ctx, len(workers))
    24  	for _, worker := range workers {
    25  		if err := wg.Start(worker); err != nil {
    26  			return wg.WaitError(err)
    27  		}
    28  	}
    29  	return wg.Wait()
    30  }