On Wed, Jan 30, 2013 at 3:06 PM, Haiwei Zhou <[email protected]> wrote:
> Cool! The open-fd-input-port is a great function. > Yes, indeed. Maybe something like this would be a useful addition to Racket. > Inotify cannot handle subtrees. I will try to make it more convenience. > FWIW, the code I gave above can add watches recursively (see around line 252), but it does not (yet) add watches to directories that are added in watched directory. It can also follow symlinks. > I plan to make a tool like guard - https://github.com/guard/guard > It's useful to run unit tests while some files are changed. > That'd be nice indeed. Laurent > > Thanks, > Haiwei > > > On 30 January 2013 20:52, Laurent <[email protected]> wrote: > >> For the record, Kevin Tew's function makes it easy to use: >> https://github.com/kazzmir/x11-racket/blob/master/fd.rkt >> >> For example, that's what I use in my own version of libinotify FFI: >> https://github.com/Metaxal/linux-tools/blob/master/inotify.rkt >> >> Laurent >> >> >> On Wed, Jan 30, 2013 at 12:28 PM, Tim Brown <[email protected]> wrote: >> >>> Resend... original (and previous resend!) sent from an address not >>> valid for the list. >>> >>> ---------- Forwarded message ---------- >>> From: Tim Brown <[email protected]> >>> Date: 30 January 2013 10:01 >>> Subject: Re: [racket] How to invoke a blocking foreign function >>> without blocking whole racket? >>> To: Haiwei Zhou <[email protected]> >>> Cc: [email protected] >>> >>> >>> There are internal FFI calls: scheme_make_fd_input_port and >>> scheme_make_fd_output_port, documented in >>> >>> http://docs.racket-lang.org/inside/Ports_and_the_Filesystem.html?q=to%20port#(idx._(gentag._480._(lib._scribblings/inside/inside..scrbl)))<http://docs.racket-lang.org/inside/Ports_and_the_Filesystem.html?q=to%20port#%28idx._%28gentag._480._%28lib._scribblings/inside/inside..scrbl%29%29%29> >>> >>> If you would normally be able to poll (or select) from the port, then >>> a little bit of work will allow you to tie your IO closer to the >>> racket events system. >>> >>> There are more involved variants, I've mostly only needed this level >>> of access at the racket level; servicing the known-to-be ready fd is >>> done by your FFI library. >>> >>> Tim >>> >>> On 30 Jan 2013 09:44, "Haiwei Zhou" <[email protected]> wrote: >>> > >>> > Finally, I figured out the callback from this letter: >>> http://lists.racket-lang.org/users/archive/2010-July/040409.html . I >>> wish I red this letter early. >>> > >>> > After realized that the foreign function blocks the caller thread, I >>> used dynamic-place to create worker thread. The code is here : >>> https://github.com/highfly22/alert/blob/master/inotify.rkt >>> > >>> > Racket is amazing simple after you know the bloody details. >>> > >>> > Haiwei >>> > >>> > >>> > On 30 January 2013 14:23, Haiwei Zhou <[email protected]> wrote: >>> >> >>> >> Hi, >>> >> >>> >> I try to wrap inotify API. After adding a watcher, I try to read >>> events from file descriptor. But the racket thread is blocking until the >>> read operation is done. Here is the definition of read. >>> >> >>> >> (define _read (get-ffi-obj "read" libc (_fun #:async-apply (lambda >>> (f) (f)) >>> >> #:save-errno 'posix >>> >> _fd_t >>> >> (output : (_bytes o size)) >>> >> (size : _uint32) >>> >> -> (r : _int32) >>> >> -> (values r saved-errno >>> output)))) >>> >> >>> >> I am confused by the term callback. Is the callback called in the >>> racket thread or another OS thread? >>> >> >>> >> Thanks, >>> >> Haiwei >>> > >>> > >>> > >>> > ____________________ >>> > Racket Users list: >>> > http://lists.racket-lang.org/users >>> > >>> ____________________ >>> Racket Users list: >>> http://lists.racket-lang.org/users >>> >> >> >
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