Initial lookbook implementation
Pinterest-style visual bookmarking app with: - URL metadata extraction (OG/Twitter meta, oEmbed fallback) - Image caching in Postgres with 480px thumbnails - Multi-tag filtering with Ctrl/Cmd for OR mode - Fuzzy tag suggestions and inline tag editing - Browser console auth() with first-use password setup - Brutalist UI with Commit Mono font and Pico CSS - Light/dark mode via browser preference
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27
vendor/golang.org/x/sync/LICENSE
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27
vendor/golang.org/x/sync/LICENSE
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Copyright 2009 The Go Authors.
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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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* 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 LLC 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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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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22
vendor/golang.org/x/sync/PATENTS
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22
vendor/golang.org/x/sync/PATENTS
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Additional IP Rights Grant (Patents)
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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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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
|
||||
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
|
||||
that this implementation of Go or any code incorporated within this
|
||||
implementation of Go constitutes direct or contributory patent
|
||||
infringement, or inducement of patent infringement, then any patent
|
||||
rights granted to you under this License for this implementation of Go
|
||||
shall terminate as of the date such litigation is filed.
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151
vendor/golang.org/x/sync/errgroup/errgroup.go
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151
vendor/golang.org/x/sync/errgroup/errgroup.go
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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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// 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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//
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// [errgroup.Group] is related to [sync.WaitGroup] but adds handling of tasks
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// returning errors.
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package errgroup
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import (
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"context"
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"fmt"
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"sync"
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)
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type token struct{}
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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. A Group should not be reused for different tasks.
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//
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// A zero Group is valid, has no limit on the number of active goroutines,
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// and does not cancel on error.
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type Group struct {
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cancel func(error)
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wg sync.WaitGroup
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sem chan token
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errOnce sync.Once
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err error
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}
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func (g *Group) done() {
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if g.sem != nil {
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<-g.sem
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}
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g.wg.Done()
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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.WithCancelCause(ctx)
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return &Group{cancel: cancel}, ctx
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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(g.err)
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}
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return g.err
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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 Go must happen before a Wait.
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// It blocks until the new goroutine can be added without the number of
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// goroutines in the group exceeding the configured limit.
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//
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// The first goroutine in the group that returns a non-nil error will
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// cancel the associated Context, if any. The error will be returned
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// by Wait.
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func (g *Group) Go(f func() error) {
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if g.sem != nil {
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g.sem <- token{}
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}
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g.wg.Add(1)
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go func() {
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defer g.done()
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// It is tempting to propagate panics from f()
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// up to the goroutine that calls Wait, but
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// it creates more problems than it solves:
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// - it delays panics arbitrarily,
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// making bugs harder to detect;
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// - it turns f's panic stack into a mere value,
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// hiding it from crash-monitoring tools;
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// - it risks deadlocks that hide the panic entirely,
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// if f's panic leaves the program in a state
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// that prevents the Wait call from being reached.
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// See #53757, #74275, #74304, #74306.
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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(g.err)
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}
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})
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}
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}()
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}
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// TryGo calls the given function in a new goroutine only if the number of
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// active goroutines in the group is currently below the configured limit.
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//
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// The return value reports whether the goroutine was started.
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func (g *Group) TryGo(f func() error) bool {
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if g.sem != nil {
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select {
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case g.sem <- token{}:
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// Note: this allows barging iff channels in general allow barging.
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default:
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return false
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}
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}
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g.wg.Add(1)
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go func() {
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defer g.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(g.err)
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}
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})
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}
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}()
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return true
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}
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// SetLimit limits the number of active goroutines in this group to at most n.
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// A negative value indicates no limit.
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// A limit of zero will prevent any new goroutines from being added.
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//
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// Any subsequent call to the Go method will block until it can add an active
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// goroutine without exceeding the configured limit.
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//
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// The limit must not be modified while any goroutines in the group are active.
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func (g *Group) SetLimit(n int) {
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if n < 0 {
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g.sem = nil
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return
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}
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if len(g.sem) != 0 {
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panic(fmt.Errorf("errgroup: modify limit while %v goroutines in the group are still active", len(g.sem)))
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}
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g.sem = make(chan token, n)
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}
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160
vendor/golang.org/x/sync/semaphore/semaphore.go
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vendor/golang.org/x/sync/semaphore/semaphore.go
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// Copyright 2017 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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// Package semaphore provides a weighted semaphore implementation.
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package semaphore // import "golang.org/x/sync/semaphore"
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import (
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"container/list"
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"context"
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"sync"
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)
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type waiter struct {
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n int64
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ready chan<- struct{} // Closed when semaphore acquired.
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}
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// NewWeighted creates a new weighted semaphore with the given
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// maximum combined weight for concurrent access.
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func NewWeighted(n int64) *Weighted {
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w := &Weighted{size: n}
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return w
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}
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// Weighted provides a way to bound concurrent access to a resource.
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// The callers can request access with a given weight.
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type Weighted struct {
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size int64
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cur int64
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mu sync.Mutex
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waiters list.List
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}
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// Acquire acquires the semaphore with a weight of n, blocking until resources
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// are available or ctx is done. On success, returns nil. On failure, returns
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// ctx.Err() and leaves the semaphore unchanged.
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func (s *Weighted) Acquire(ctx context.Context, n int64) error {
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done := ctx.Done()
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s.mu.Lock()
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select {
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case <-done:
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// ctx becoming done has "happened before" acquiring the semaphore,
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// whether it became done before the call began or while we were
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// waiting for the mutex. We prefer to fail even if we could acquire
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// the mutex without blocking.
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s.mu.Unlock()
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return ctx.Err()
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default:
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}
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if s.size-s.cur >= n && s.waiters.Len() == 0 {
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// Since we hold s.mu and haven't synchronized since checking done, if
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// ctx becomes done before we return here, it becoming done must have
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// "happened concurrently" with this call - it cannot "happen before"
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// we return in this branch. So, we're ok to always acquire here.
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s.cur += n
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s.mu.Unlock()
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return nil
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}
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if n > s.size {
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// Don't make other Acquire calls block on one that's doomed to fail.
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s.mu.Unlock()
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<-done
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return ctx.Err()
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}
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ready := make(chan struct{})
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w := waiter{n: n, ready: ready}
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elem := s.waiters.PushBack(w)
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s.mu.Unlock()
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select {
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case <-done:
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s.mu.Lock()
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select {
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case <-ready:
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// Acquired the semaphore after we were canceled.
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// Pretend we didn't and put the tokens back.
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s.cur -= n
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s.notifyWaiters()
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default:
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isFront := s.waiters.Front() == elem
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s.waiters.Remove(elem)
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// If we're at the front and there're extra tokens left, notify other waiters.
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if isFront && s.size > s.cur {
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s.notifyWaiters()
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}
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}
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s.mu.Unlock()
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return ctx.Err()
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case <-ready:
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// Acquired the semaphore. Check that ctx isn't already done.
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// We check the done channel instead of calling ctx.Err because we
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// already have the channel, and ctx.Err is O(n) with the nesting
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// depth of ctx.
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select {
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case <-done:
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s.Release(n)
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return ctx.Err()
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default:
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}
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return nil
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}
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}
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// TryAcquire acquires the semaphore with a weight of n without blocking.
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// On success, returns true. On failure, returns false and leaves the semaphore unchanged.
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func (s *Weighted) TryAcquire(n int64) bool {
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s.mu.Lock()
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success := s.size-s.cur >= n && s.waiters.Len() == 0
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if success {
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s.cur += n
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}
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s.mu.Unlock()
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return success
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}
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// Release releases the semaphore with a weight of n.
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func (s *Weighted) Release(n int64) {
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s.mu.Lock()
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s.cur -= n
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if s.cur < 0 {
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s.mu.Unlock()
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panic("semaphore: released more than held")
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}
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s.notifyWaiters()
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s.mu.Unlock()
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}
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func (s *Weighted) notifyWaiters() {
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for {
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next := s.waiters.Front()
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if next == nil {
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break // No more waiters blocked.
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}
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w := next.Value.(waiter)
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if s.size-s.cur < w.n {
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// Not enough tokens for the next waiter. We could keep going (to try to
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// find a waiter with a smaller request), but under load that could cause
|
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// starvation for large requests; instead, we leave all remaining waiters
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// blocked.
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//
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// Consider a semaphore used as a read-write lock, with N tokens, N
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// readers, and one writer. Each reader can Acquire(1) to obtain a read
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// lock. The writer can Acquire(N) to obtain a write lock, excluding all
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// of the readers. If we allow the readers to jump ahead in the queue,
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||||
// the writer will starve — there is always one token available for every
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// reader.
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break
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}
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||||
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s.cur += w.n
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s.waiters.Remove(next)
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||||
close(w.ready)
|
||||
}
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||||
}
|
||||
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