End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IO#wait_writable
io.wait_writable → truthy or falsy
io.wait_writable(timeout) → truthy or falsy
ext/io/wait/wait.c
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static VALUE
io_wait_writable(int argc, VALUE *argv, VALUE io)
{
rb_io_t *fptr;
#ifndef HAVE_RB_IO_WAIT
struct timeval timerec;
struct timeval *tv;
#endif
GetOpenFile(io, fptr);
rb_io_check_writable(fptr);
#ifndef HAVE_RB_IO_WAIT
tv = get_timeout(argc, argv, &timerec);
if (wait_for_single_fd(fptr, RB_WAITFD_OUT, tv)) {
return io;
}
return Qnil;
#else
rb_check_arity(argc, 0, 1);
VALUE timeout = (argc == 1 ? argv[0] : Qnil);
return io_wait_event(io, RUBY_IO_WRITABLE, timeout, 1);
#endif
}
Waits until IO is writable and returns a truthy value or a falsy value when times out.
You must require ‘io/wait’ to use this method.
Ruby version changes
-
3.0
-
IO#wait_readable,IO#wait_writable,IO#read,IO#writeand other related methods (e.g.IO#puts,IO#gets) may invoke the scheduler hook io_wait(io, events, timeout) in a non-blocking execution context. [Feature #16786]
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