https://stackoverflow.com/a/75730483/1271826

ExperimentView.swift

import SwiftUI
import AsyncAlgorithms
import os.log

private let poi = OSSignposter(subsystem: "MyApp", category: .pointsOfInterest)

typealias AsyncClosure = () async -> Void

struct ExperimentView: View {
    @StateObject var viewModel = ExperimentViewModel()

    var body: some View {
        VStack {
            Button("Red")   { Task { await viewModel.addRed()   } }
            Button("Green") { Task { await viewModel.addGreen() } }
            Button("Blue")  { Task { await viewModel.addBlue()  } }
        }
        .task {
            await viewModel.monitorChannel()
        }
    }
}

@MainActor
class ExperimentViewModel: ObservableObject {
    let channel = AsyncChannel<AsyncClosure>()

    func monitorChannel() async {
        for await block in channel {
            await block()
        }
    }

    func addRed() async {
        poi.emitEvent(#function)
        await channel.send { await self.red() }
    }

    func addGreen() async {
        poi.emitEvent(#function)
        await channel.send { await self.green() }
    }

    func addBlue() async {
        poi.emitEvent(#function)
        await channel.send { await self.blue() }
    }

    func red() async {
        let state = poi.beginInterval(#function)
        defer { poi.endInterval(#function, state) }

        try? await Task.sleep(for: .seconds(3))
    }

    func green() async {
        let state = poi.beginInterval(#function)
        defer { poi.endInterval(#function, state) }

        try? await Task.sleep(for: .seconds(3))
    }

    func blue() async {
        let state = poi.beginInterval(#function)
        defer { poi.endInterval(#function, state) }

        try? await Task.sleep(for: .seconds(3))
    }
}

Unlike my original answer, this is using standard “Points of Interest” tool, so the graph looks less colorful, but doesn’t require you to install my custom point of interest tool:

But the idea is the same. I rapidly tapped “red”, “green”, and “blue” buttons in succession, repeating the process three times. I then repeated the exercise, but this second time, I dismissed the view in question before it was completed, thereby canceling the channel (and its associated tasks).

FWIW, in case anyone is interested in how I generated the multicolored intervals in my original answer, see CustomPointsOfInterest. But it is not immediately relevant to the question at hand, but was merely a nice visual way of associating the red, green, and blue intervals with the associated functions in my original answer. But I have excised it from my MRE above (and the associated repo) for the sake of simplicity.