Run Concurrent Computation

package main

// Query available heap size (KB) from the JavaScript host
extern func requestHeapSizeKB() int

// Memory allocator provided by runtime
extern func malloc(size int) *byte

// UI update callback to the JavaScript host
extern func displayResult(sum int, mul int)

func compute(a int, b int) (int, int) {
    return a + b, a * b
}

func main() int {
    // 1. Query available size (KB) from JS host
    heapKB := requestHeapSizeKB()

    // 2. Allocate memory configured by host
    heapBuffer := malloc(heapKB * 1024)

    // 3. Offload work to background thread and await with <-
    sum, mul := <-Async(func() (int, int) {
        return compute(15, 3)
    })

    // 4. Update results in browser UI
    displayResult(sum, mul)
    return 0
}