From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: open a file non-blocking ? Date: Tue, 27 Feb 2018 18:32:40 +0100 Organization: Aioe.org NNTP Server Message-ID: References: <6c0d9514-97e0-4c5e-9b7d-b247c2ca0ced@googlegroups.com> NNTP-Posting-Host: yZRtMzZmKCYxZ5GHo5ZYiA.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 X-Notice: Filtered by postfilter v. 0.8.3 Content-Language: en-US Xref: reader02.eternal-september.org comp.lang.ada:50687 Date: 2018-02-27T18:32:40+01:00 List-Id: On 2018-02-27 18:14, patrick@spellingbeewinnars.org wrote: > In C I can open with O_NONBLOCK. Is there the same in Ada? Sure. If your system has open() you can call it from Ada just like you would do from C. > I have different applications but one would be to read from several serial ports. Serial ports are very slow and if opened non-blocking a single task could easily monitor them. > > Tasking is nice but I don't think it is a good idea to use it if there is a simple single threaded solution. Ah, you actually want "get immediately" for a COM port. That is already done. See GNAT.Serial_Communications package which does what you want. You can poll ports from one task if you wanted. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de