Sleep Sort in Awk

Welcome to the Sleep Sort in Awk page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

@load "time"

function usage() {
    print "Usage: please provide a list of at least two integers to sort in the format \"1, 2, 3, 4, 5\""
    exit(1)
}

function str_to_number(s) {
    return (s ~ /^\s*[+-]*[0-9]+\s*$/) ? s + 0 : "ERROR"
}

function str_to_array(s, arr,  str_arr, idx, result) {
    split(s, str_arr, ",")
    for (idx in str_arr) {
        result = str_to_number(str_arr[idx])
        if (result == "ERROR") {
            delete arr
            arr[1] = "ERROR"
            break
        } else {
            arr[idx] = result
        }
    }
}

# Awk does not have threads. However, it does have a functions to get the
# current system time and sleep with fractions of a second precision. Use those
# to monitor the elapsed time, and use that to sort the array
function sleep_sort(arr, arr_len,  curr_time, start_time, elapsed_time, i, t, num_sorted) {
    # Get initial time
    start_time = gettimeofday()

    # Indicate no sorted elements yet
    num_sorted = 0

    # Repeat unit array is sorted
    while (num_sorted < arr_len) {
        # When elapsed time for array element expires, swap it from the unsorted to the
        # sorted part of the array
        elapsed_time = gettimeofday() - start_time
        for (i = num_sorted + 1; i <= arr_len; i++) {
            if (elapsed_time >= arr[i]) {
                num_sorted++
                t = arr[i]
                arr[i] = arr[num_sorted]
                arr[num_sorted] = t
            }
        }

        sleep(0.5)
    }
}

function show_array(arr,  idx, s) {
    s = ""
    for (idx in arr) {
        if (s) {
            s = s ", "
        }
        s = s arr[idx]
    }

    print s
}

BEGIN {
    if (ARGC < 2) {
        usage()
    }

    str_to_array(ARGV[1], arr)
    arr_len = length(arr)
    if (!arr_len || arr_len < 2) {
        usage()
    }

    sleep_sort(arr, arr_len)
    show_array(arr)
}

Sleep Sort in Awk was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

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