114 lines
2.2 KiB
Go
114 lines
2.2 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/atomic"
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"unsafe"
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"github.com/goplus/llgo/c/libuv"
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)
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type bindAsync struct {
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libuv.Async
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cb func()
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}
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func BindIO[T any](call IO[T], callback func(T)) {
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loop := Exec().L
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a := &bindAsync{}
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loop.Async(&a.Async, func(p *libuv.Async) {
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(*bindAsync)(unsafe.Pointer(p)).cb()
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})
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done := atomic.Bool{}
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ctx := &AsyncContext{
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Executor: Exec(),
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complete: func() {
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done.Store(true)
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a.Async.Send()
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},
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}
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f := call(ctx)
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called := false
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a.cb = func() {
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if called {
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return
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}
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a.Async.Close(nil)
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result := f()
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callback(result)
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}
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// don't delay the callback if the future is already done
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if done.Load() {
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called = true
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a.cb()
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}
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}
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func Await[T1 any](call IO[T1]) (ret T1) {
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BindIO(call, func(v T1) {
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ret = v
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})
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return
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}
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// -----------------------------------------------------------------------------
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func Race[T1 any](calls ...IO[T1]) IO[T1] {
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return Async(func(resolve func(T1)) {
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done := false
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for _, call := range calls {
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var f Future[T1]
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f = call(&AsyncContext{
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Executor: Exec(),
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complete: func() {
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if done {
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return
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}
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done = true
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resolve(f())
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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](calls ...IO[T1]) IO[[]T1] {
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return Async(func(resolve func([]T1)) {
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n := len(calls)
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results := make([]T1, n)
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done := 0
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for i, call := range calls {
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i := i
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var f Future[T1]
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f = call(&AsyncContext{
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Executor: Exec(),
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complete: func() {
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results[i] = f()
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done++
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if done == n {
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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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}
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