On Fri, 14 Feb 2014 14:05:01 -0500, Thomas <sitronv...@gmail.com> wrote:
I'm new to D, and I find it quite enjoyable so far. I have however stumbled upon a problem which I can't seem to figure out. I am trying to make a program that creates a child process, writes something to the child process stdin and reading from its stdout. I am going to use it later for testing out process pair redundancy. Appearently the child blocks at "s = stdin.readln()". If I remove all writing to the child, and instead just read its output, everything works fine. My code is attached below:
stdin and stdout are buffered streams. Buffered streams in D only flush on newline when they are attached to a console (terminal window). Otherwise, they wait until the buffer is full before flushing. Buffer is probably about 4096 bytes.
What is likely happening is that you are writing, it's going into the buffer, but not flushing, and then you are waiting for the response (which likely is also not flushing from the child process).
Try adding flushes after each writeln. BTW, this is not really a D problem, you would have the same issue in C. -Steve
