mirror of https://github.com/k3d-io/k3d
parent
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# This source code refers to The Go Authors for copyright purposes. |
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# The master list of authors is in the main Go distribution, |
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# visible at http://tip.golang.org/AUTHORS. |
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# This source code was written by the Go contributors. |
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# The master list of contributors is in the main Go distribution, |
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# visible at http://tip.golang.org/CONTRIBUTORS. |
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Copyright (c) 2009 The Go Authors. All rights reserved. |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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|
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above |
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copyright notice, this list of conditions and the following disclaimer |
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in the documentation and/or other materials provided with the |
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distribution. |
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* Neither the name of Google Inc. nor the names of its |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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Additional IP Rights Grant (Patents) |
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|
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"This implementation" means the copyrightable works distributed by |
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Google as part of the Go project. |
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|
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Google hereby grants to You a perpetual, worldwide, non-exclusive, |
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no-charge, royalty-free, irrevocable (except as stated in this section) |
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patent license to make, have made, use, offer to sell, sell, import, |
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transfer and otherwise run, modify and propagate the contents of this |
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implementation of Go, where such license applies only to those patent |
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claims, both currently owned or controlled by Google and acquired in |
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the future, licensable by Google that are necessarily infringed by this |
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implementation of Go. This grant does not include claims that would be |
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infringed only as a consequence of further modification of this |
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implementation. If you or your agent or exclusive licensee institute or |
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order or agree to the institution of patent litigation against any |
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entity (including a cross-claim or counterclaim in a lawsuit) alleging |
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that this implementation of Go or any code incorporated within this |
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implementation of Go constitutes direct or contributory patent |
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infringement, or inducement of patent infringement, then any patent |
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rights granted to you under this License for this implementation of Go |
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shall terminate as of the date such litigation is filed. |
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// Copyright 2016 The Go Authors. All rights reserved.
|
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// Use of this source code is governed by a BSD-style
|
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// license that can be found in the LICENSE file.
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|
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// Package errgroup provides synchronization, error propagation, and Context
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// cancelation for groups of goroutines working on subtasks of a common task.
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package errgroup |
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import ( |
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"context" |
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"sync" |
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) |
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// A Group is a collection of goroutines working on subtasks that are part of
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// the same overall task.
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//
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// A zero Group is valid and does not cancel on error.
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type Group struct { |
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cancel func() |
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wg sync.WaitGroup |
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errOnce sync.Once |
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err error |
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} |
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// WithContext returns a new Group and an associated Context derived from ctx.
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//
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// The derived Context is canceled the first time a function passed to Go
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// returns a non-nil error or the first time Wait returns, whichever occurs
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// first.
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func WithContext(ctx context.Context) (*Group, context.Context) { |
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ctx, cancel := context.WithCancel(ctx) |
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return &Group{cancel: cancel}, ctx |
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} |
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|
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// Wait blocks until all function calls from the Go method have returned, then
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// returns the first non-nil error (if any) from them.
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func (g *Group) Wait() error { |
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g.wg.Wait() |
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if g.cancel != nil { |
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g.cancel() |
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} |
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return g.err |
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} |
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|
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// Go calls the given function in a new goroutine.
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//
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// The first call to return a non-nil error cancels the group; its error will be
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// returned by Wait.
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func (g *Group) Go(f func() error) { |
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g.wg.Add(1) |
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go func() { |
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defer g.wg.Done() |
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if err := f(); err != nil { |
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g.errOnce.Do(func() { |
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g.err = err |
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if g.cancel != nil { |
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g.cancel() |
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} |
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}) |
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} |
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}() |
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} |
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