Then isn’t the example functionally equivalent to:
func doit() {
DispatchQueue.global().async {
let dataResource = loadWebResource("dataprofile.txt")
let imageResource = loadWebResource("imagedata.dat")
let imageTmp = decodeImage(dataResource, imageResource)
let imageResult = dewarpAndCleanupImage(imageTmp)
DispatchQueue.main.async {
self.imageResult = imageResult
}
}
}
if all of the API were synchronous? Why wouldn’t we just exhort people to write
synchronous API code and continue using libdispatch? What am I missing?
-Kenny
> On Sep 8, 2017, at 2:33 PM, David Hart <da...@hartbit.com> wrote:
>
>
>> On 8 Sep 2017, at 20:34, Kenny Leung via swift-evolution
>> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
>>
>> Hi All.
>>
>> A point of clarification in this example:
>>
>> func loadWebResource(_ path: String) async -> Resource
>> func decodeImage(_ r1: Resource, _ r2: Resource) async -> Image
>> func dewarpAndCleanupImage(_ i : Image) async -> Image
>>
>> func processImageData1() async -> Image {
>> let dataResource = await loadWebResource("dataprofile.txt")
>> let imageResource = await loadWebResource("imagedata.dat")
>> let imageTmp = await decodeImage(dataResource, imageResource)
>> let imageResult = await dewarpAndCleanupImage(imageTmp)
>> return imageResult
>> }
>>
>> Do these:
>>
>> await loadWebResource("dataprofile.txt")
>> await loadWebResource("imagedata.dat")
>>
>> happen in in parallel?
>
> They don’t happen in parallel.
>
>> If so, how can I make the second one wait on the first one? If not, how can
>> I make them go in parallel?
>>
>> Thanks!
>>
>> -Kenny
>>
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>> swift-evolution@swift.org <mailto:swift-evolution@swift.org>
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>
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