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Question about writing to a file in Producer-Consumer program


By : Herobs
Date : September 11 2020, 08:00 AM
To fix this issue I have to write two separate programs, which one is a Producer and second is a Consumer (both running in separate terminals). I provide an argument to the Producer which can be a text or a single character. Then, producer creates a .txt file, puts single character into it then closes it. Consumer opens that file, reads that character and prints it on a terminal, then closes the file and deletes it.The whole process repeats itself. If provided argument includes *, for example * or text* it finishes the both programs, printing * before ending. I can only use functions: open(), close(), read(), write(), unlink(). The expected result looks like this: , I will limit my answer to your only specific question:
code :
do{
    int fdi = -1;
    while (fdi < 0){
        // Open the file only if it does not exist, creating it.
        fdi = open("test.txt", O_WRONLY | O_CREAT | O_EXCL, 0666);
    }

    // Read 1 char from stdin.
    read(STDIN_FILENO, &buff, SIZE);     

    // Write that char to the beginning of the file.
    write(fdi, &buff, SIZE);

    // Close and truncate the file.
    close(fdi);
} while(buff != '*');


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couple of question about : wcf self service , consumer/ producer


By : Ryan R
Date : March 29 2020, 07:55 AM
hop of those help?
This will depend on many different factors such as what your "minimum amount of time" is, what you service does, latency, disk I/O if applicable, your InstanceContextMode, etc. Too broad of a question to answer specifically, but WCF as a platform can handle many thousands of calls per second depending on your hardware.

Producer/Consumer Multi producers and a single Consumer writing to File Python


By : user3482796
Date : March 29 2020, 07:55 AM
this will help since you are already using multiprocess, all you need is the Queue class
and a sample (modified from the Queue docs)
code :
from multiprocessing import Process, Queue

def child(q, url):
    result = my_process(url)
    q.put(result)

if __name__ == '__main__':
    q = Queue()
    urls = [...]
    children = []
    for url in urls:
       p = Process(target=child, args=(q,url))
       p.start()
       children.append(p)
    for p in children:
       p.join()
       print q.get() #or write to file (might not be the answer from this child)
while 0 != multiprocessing.active_children():
    print q.get()

Producer-Consumer wtih remote message queue as producer and ExecutorService as local consumer


By : TFung
Date : March 29 2020, 07:55 AM
like below fixes the issue If you use the ThreadPoolExecutor implementation of the ExecutorService then you'll have access to the information you need that's missing from the ExecutorService (e.g. getActiveCount() and getTaskCount())

Cannot catch SIGINT signal in a producer-consumer program where JNI is used in consumer thread


By : munawar munir
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , It seems, you need the -Xrs option
-Xrs

How to properly use asyncio in a multi-producer-consumer flow that involves writing to a file or a .gzip file?


By : 王永进
Date : September 01 2020, 07:00 AM
hop of those help? How asyncio works
Let's consider a task of making two web requests.
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