method

wait_readable

Ruby latest stable (v2_5_5) - 0 notes - Class: IO

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wait_readable(*args) public

Waits until IO is readable without blocking and returns self, or nil when times out. Returns true immediately when buffered data is available.

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static VALUE
io_wait_readable(int argc, VALUE *argv, VALUE io)
{
    rb_io_t *fptr;
    struct timeval timerec;
    struct timeval *tv;

    GetOpenFile(io, fptr);
    rb_io_check_readable(fptr);
    tv = get_timeout(argc, argv, &timerec);
    if (rb_io_read_pending(fptr)) return Qtrue;
    if (wait_for_single_fd(fptr, RB_WAITFD_IN, tv)) {
        return io;
    }
    return Qnil;
}

wait_readable

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