Behaves different on my osx and linux machines

Dec 21, 2023

Christian Köstlin

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December 21, 2023

Behaves different on my osx and linux machines

Posted by Christian Köstlin

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Christian Köstlin

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I have this somehow reduced program that behaves differently on osx and linux.


```d
void stdioMain()
{
    import std.stdio : readln, writeln;
    import std.concurrency : spawnLinked, receive, receiveTimeout, LinkTerminated;
    import std.variant : Variant;
    import std.string : strip;
    import std.process : execute;
    import core.time : dur;
    auto input = spawnLinked(() {
            string getInput() {
                writeln("Please enter something:");
                return readln().strip();
            }
            string line = getInput();
            while (line != "quit")
            {
                writeln("You entered ", line);
                line = getInput();
            }
        });

    bool done = false;
    while (!done) {
        auto result = ["echo", "Hello World"].execute;
        if (result.status != 0)
        {
            throw new Exception("echo failed");
        }
        writeln(result.output);
        receiveTimeout(dur!"msecs"(-1),
          (LinkTerminated t) {
              writeln("Done");
              done = true;
          },
        );
    }
    writeln("ByeBye");
}

void main(string[] args)
{
    stdioMain();
}
`

It should just read from stdin in one separate thread and on the main thread it just executes one `echo` after the other (and tries to find out, if the other thread finished).

In linux this behaves as expected, meaning it prints a lot of hello worlds.

In osx on the other hand it prints 'please enter something', waits for my input, prints it, and outputs one hello world.

What did I do wrong?

Kind regards,
Christian

p.s.: i am using ldc-1.35.0 osx version is 13.6.

bool done = false; while (!done) { writeln(1); auto result = ["echo", "Hello World"].execute; if (result.status != 0) { writeln(2); throw new Exception("echo failed"); } writeln(result.output); receiveTimeout(dur!"msecs"(-1), (LinkTerminated t) { writeln("Done"); done = true; }, ); writeln(3); } writeln("ByeBye");

Running vibe-io 1 Please enter something: asdf You entered asdf Please enter something: Hello World 3 1 asdf You entered asdf Please enter something: Hello World 3 1 qwer You entered qwer Please enter something: Hello World 3 1

bool done = false; while (!done) { puts("1"); auto result = ["echo", "Hello World"].execute; if (result.status != 0) { writeln(2); throw new Exception("echo failed"); } puts("2"); writeln(result.output); puts("3"); receiveTimeout(dur!"msecs"(-1), (LinkTerminated t) { writeln("Done"); done = true; }, ); writeln(4); } writeln("ByeBye");

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