105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
//go:build llgo
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// +build llgo
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/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package async
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import (
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"sync"
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"sync/atomic"
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"github.com/goplus/llgo/c/libuv"
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"github.com/goplus/llgo/x/cbind"
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)
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// Currently Async run chain a future that call chain in the goroutine running `async.Run`.
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func Async[T any](fn func(func(T))) Future[T] {
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var result T
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var resultReady atomic.Bool
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var callbacks []func(T)
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var mutex sync.Mutex
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loop := Exec().L
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var a *libuv.Async
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var cb libuv.AsyncCb
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a, cb = cbind.BindF[libuv.Async, libuv.AsyncCb](func(a *libuv.Async) {
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a.Close(nil)
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mutex.Lock()
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currentCallbacks := callbacks
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callbacks = nil
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mutex.Unlock()
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for _, callback := range currentCallbacks {
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callback(result)
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}
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})
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loop.Async(a, cb)
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// Execute fn immediately
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fn(func(v T) {
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result = v
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resultReady.Store(true)
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a.Send()
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})
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return func(chain func(T)) {
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mutex.Lock()
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if resultReady.Load() {
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mutex.Unlock()
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chain(result)
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} else {
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callbacks = append(callbacks, chain)
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mutex.Unlock()
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}
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}
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}
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// -----------------------------------------------------------------------------
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func Race[T1 any](futures ...Future[T1]) Future[T1] {
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return Async(func(resolve func(T1)) {
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done := atomic.Bool{}
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for _, future := range futures {
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future.Then(func(v T1) {
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if !done.Swap(true) {
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// Just resolve the first one.
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resolve(v)
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}
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})
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}
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})
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}
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func All[T1 any](futures ...Future[T1]) Future[[]T1] {
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return Async(func(resolve func([]T1)) {
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n := len(futures)
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results := make([]T1, n)
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var done uint32
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for i, future := range futures {
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i := i
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future.Then(func(v T1) {
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results[i] = v
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if atomic.AddUint32(&done, 1) == uint32(n) {
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// All done.
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resolve(results)
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}
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})
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}
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})
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}
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