From: Navindra Umanee <navindra@...>
Date: 2005-02-18T12:33:13+09:00
Subject: Re: pulling my hair out, why won't Kernel.sleep(0) sleep?

Sam Roberts <sroberts@uniserve.com> wrote:
> Can anybody give me any hints as to what I should be looking for? What
> can cause sleep(0) to wake up?

The documentation is wrong. 

sleep(0) returns immediately.  sleep with *zero* arguments sleeps
forever.

static VALUE
rb_f_sleep(argc, argv)
    int argc;
    VALUE *argv;
{
    int beg, end;

    beg = time(0);
    if (argc == 0) {
        rb_thread_sleep_forever();
    }
    else if (argc == 1) {
        rb_thread_wait_for(rb_time_interval(argv[0]));
    }
    else {
        rb_raise(rb_eArgError, "wrong number of arguments");
    }

    end = time(0) - beg;

    return INT2FIX(end);
}

Cheers,
Navin.