146 lines
2.8 KiB
Go
146 lines
2.8 KiB
Go
/*
|
|
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
|
|
*
|
|
* 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 async
|
|
|
|
import (
|
|
"context"
|
|
"unsafe"
|
|
_ "unsafe"
|
|
|
|
"github.com/goplus/llgo/c/libuv"
|
|
)
|
|
|
|
type Void = [0]byte
|
|
|
|
type Future[T any] func() T
|
|
|
|
type IO[T any] func(e *AsyncContext) Future[T]
|
|
|
|
type Chain[T any] func(callback func(T))
|
|
|
|
func (f Future[T]) Do(callback func(T)) {
|
|
callback(f())
|
|
}
|
|
|
|
type AsyncContext struct {
|
|
context.Context
|
|
*Executor
|
|
Complete func()
|
|
}
|
|
|
|
func Async[T any](fn func(resolve func(T))) IO[T] {
|
|
return func(ctx *AsyncContext) Future[T] {
|
|
var result T
|
|
var done bool
|
|
fn(func(t T) {
|
|
result = t
|
|
done = true
|
|
ctx.Complete()
|
|
})
|
|
return func() T {
|
|
if !done {
|
|
panic("AsyncIO: Future accessed before completion")
|
|
}
|
|
return result
|
|
}
|
|
}
|
|
}
|
|
|
|
type bindAsync struct {
|
|
libuv.Async
|
|
cb func()
|
|
}
|
|
|
|
func BindIO[T any](call IO[T], callback func(T)) {
|
|
loop := Exec().L
|
|
a := &bindAsync{}
|
|
loop.Async(&a.Async, func(p *libuv.Async) {
|
|
(*bindAsync)(unsafe.Pointer(p)).cb()
|
|
})
|
|
ctx := &AsyncContext{
|
|
Context: context.Background(),
|
|
Executor: Exec(),
|
|
Complete: func() {
|
|
a.Async.Send()
|
|
},
|
|
}
|
|
f := call(ctx)
|
|
a.cb = func() {
|
|
a.Async.Close(nil)
|
|
result := f()
|
|
callback(result)
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
func Await[T1 any](call IO[T1]) (ret T1) {
|
|
ch := make(chan struct{})
|
|
f := call(&AsyncContext{
|
|
Context: context.Background(),
|
|
Executor: Exec(),
|
|
Complete: func() {
|
|
close(ch)
|
|
},
|
|
})
|
|
<-ch
|
|
return f()
|
|
}
|
|
|
|
func Race[T1 any](calls ...IO[T1]) IO[T1] {
|
|
return Async(func(resolve func(T1)) {
|
|
done := false
|
|
for _, call := range calls {
|
|
var f Future[T1]
|
|
f = call(&AsyncContext{
|
|
Context: context.Background(),
|
|
Executor: Exec(),
|
|
Complete: func() {
|
|
if done {
|
|
return
|
|
}
|
|
done = true
|
|
resolve(f())
|
|
},
|
|
})
|
|
}
|
|
})
|
|
}
|
|
|
|
func All[T1 any](calls ...IO[T1]) IO[[]T1] {
|
|
return Async(func(resolve func([]T1)) {
|
|
n := len(calls)
|
|
results := make([]T1, n)
|
|
done := 0
|
|
for i, call := range calls {
|
|
i := i
|
|
var f Future[T1]
|
|
f = call(&AsyncContext{
|
|
Context: context.Background(),
|
|
Executor: Exec(),
|
|
Complete: func() {
|
|
results[i] = f()
|
|
done++
|
|
if done == n {
|
|
resolve(results)
|
|
}
|
|
},
|
|
})
|
|
}
|
|
})
|
|
}
|