Condition

The Condition() function is used to create a condition variable object, which is used to achieve synchronization and communication between threads in a multi-threaded concurrent environment. Through Condition(), a thread can wait when certain conditions are not met until another thread notifies it that the condition has been met.

The Condition() function returns a ThreadCondition object.

ThreadCondition object

Condition()

function consumer(productionQuantity, dict, condition) {
    for (var i = 0; i < productionQuantity; i++) {
        condition.acquire()
        while (dict.get("array").length == 0) {
            condition.wait()
        }
        var arr = dict.get("array")
        var count = arr.shift()
        dict.set("array", arr)
        Log("consumer:", count, ", array:", arr)
        condition.release()
        Sleep(1000)
    }
}

function producer(productionQuantity, dict, condition) {
    for (var i = 0; i < productionQuantity; i++) {
        condition.acquire()
        var arr = dict.get("array")
        arr.push(i)
        dict.set("array", arr)
        Log("producer:", i, ", array:", arr)
        condition.notify()
        condition.release()
        Sleep(1000)
    }
}

function main() {
    var dict = threading.Dict()
    dict.set("array", [])
    var condition = threading.Condition()
    var productionQuantity = 10
    var producerThread = threading.Thread(producer, productionQuantity, dict, condition)
    var consumerThread = threading.Thread(consumer, productionQuantity, dict, condition)
    consumerThread.join()
    producerThread.join()
}

Two concurrent threads access a common resource.

The backtesting system does not implement this functionality, it only defines it.

{@fun/Threads/threading/getThread getThread}, {@fun/Threads/threading/mainThread mainThread}, {@fun/Threads/threading/currentThread currentThread}, {@fun/Threads/threading/Lock Lock}, {@fun/Threads/threading/Thread Thread}, {@fun/Threads/threading/Event Event}, {@fun/Threads/threading/Dict Dict}, {@fun/Threads/threading/pending pending}, {@fun/Threads/threading/eventLoop eventLoop}

Lock Event