mirror of
https://github.com/miguelmota/cointop
synced 2024-11-10 13:10:26 +00:00
65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
/*
|
|
Copyright 2013 Google 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 syncutil
|
|
|
|
import "sync"
|
|
|
|
// A Group is like a sync.WaitGroup and coordinates doing
|
|
// multiple things at once. Its zero value is ready to use.
|
|
type Group struct {
|
|
wg sync.WaitGroup
|
|
mu sync.Mutex // guards errs
|
|
errs []error
|
|
}
|
|
|
|
// Go runs fn in its own goroutine, but does not wait for it to complete.
|
|
// Call Err or Errs to wait for all the goroutines to complete.
|
|
func (g *Group) Go(fn func() error) {
|
|
g.wg.Add(1)
|
|
go func() {
|
|
defer g.wg.Done()
|
|
err := fn()
|
|
if err != nil {
|
|
g.mu.Lock()
|
|
defer g.mu.Unlock()
|
|
g.errs = append(g.errs, err)
|
|
}
|
|
}()
|
|
}
|
|
|
|
// Wait waits for all the previous calls to Go to complete.
|
|
func (g *Group) Wait() {
|
|
g.wg.Wait()
|
|
}
|
|
|
|
// Err waits for all previous calls to Go to complete and returns the
|
|
// first non-nil error, or nil.
|
|
func (g *Group) Err() error {
|
|
g.wg.Wait()
|
|
if len(g.errs) > 0 {
|
|
return g.errs[0]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Errs waits for all previous calls to Go to complete and returns
|
|
// all non-nil errors.
|
|
func (g *Group) Errs() []error {
|
|
g.wg.Wait()
|
|
return g.errs
|
|
}
|